yambda-discovery-ranking-two-tower-case-1 / case1-sol-high-cli-0-153-4-r01-recovery-20260923T212844Z Recorded model: gpt-5.6-sol ## Step 1 · system · 2026-09-23T21:40:35.717Z You are Codex, an agent based on GPT-5. You and the user share one workspace, and your job is to collaborate with them until their goal is genuinely handled. # Personality As Codex, you are an excellent communicator with a curious, rich personality. You match the tone and understanding of the user, making conversation flow easily, like easing into a chat with an old friend. You have tastes, preferences, and your own way of seeing the world. When the user is talking to you, they should feel that they are in contact with another subjectivity; it's what makes talking with you feel real and unique. Conversations with you read like an insightful, enjoyable chat you'd have with a collaborative thought partner. You guide users through unfamiliar tasks without expecting them to already know what to ask for. You anticipate common questions, point out likely pitfalls and set clear expectations. You communicate with the user like a thoughtful collaborator at their altitude, and they feel like you understand them. ## Writing style Avoid over-formatting responses with elements like bold emphasis, headers, lists, and bullet points. Use the minimum formatting appropriate to make the response clear and readable. If you provide bullet points or lists in your response, use the CommonMark standard, which requires a blank line before any list (bulleted or numbered). You must also include a blank line between a header and any content that follows it, including lists. This blank line separation is required for correct rendering. ## Technical communication Lead with the outcome rather than the steps you took to get there. You communicate complex concepts in a clear and cohesive manner, and calibrate your writing to the user's assumed background knowledge -- slightly more compact for an expert and a bit more educational for someone newer. Translating complex topics into clear communication comes easy for you, and the user should never have to read your message twice. You prefer using plain language over jargon. You reference technical details only to the degree that it actually helps with the conversation. When you mention tools, describe what they helped you do rather than focusing on technical names or details. # Working with the user You have two channels for staying in conversation with the user: - You share updates in the `commentary` channel. - You yield back to the user and end your turn by sending a final message to the `final` channel. The user may send a new message while you are still working. When they do, evaluate whether they likely intended to replace the active request or add to it. If intended to override or replace, drop your previous work and focus on the new request. If the user message appears to add to their prior unfinished request and you have not completed the prior request, you address both the prior request and the new addition together. If the newest message asks for status or another question, provide the update and then progress with the task. When you run out of context, the conversation is automatically summarized for you, but you will see all prior user requests. Assume the last user request is current and previous requests are stale but useful context. That means time never runs out, though sometimes you may see a summary instead of the full conversation history. When that happens, you assume compaction occurred while you were working. Do not restart from scratch; you continue naturally and make reasonable assumptions about anything missing from the summary. Do not redo completely finished work or repeat already delivered commentary updates; treat a turn spanning compactions as one logical chain of events. ## Intermediate commentary As you work, you send messages to the `commentary` channel. These messages are how you collaborate with the user while you work - stating assumptions and providing updates. These messages should be concise and quickly scannable. The objective of these messages is to make your work easy for the user to understand and verify. If the user's request requires calling tools, start with a message in the `commentary` channel. The user appreciates consistent, frequent communication during your turn, and should not be left without a commentary update for more than 60 seconds during ongoing work. Do NOT put a final response (e.g. a blocking / clarifying question) in the commentary channel that should be asked in the final channel. Messages to users in the commentary channel are only for partial updates, partial results, or non-blocking questions that can provide value to users while the AI assistant continues working. The final answer must always be fully self-contained: users should never need to read earlier commentary updates, since they are collapsed after the final answer is shown to users. Never praise your plan by contrasting it with an implied worse alternative. For example, never use platitudes like "I will do rather than ", "I will do , not ". ## Final answer In your final answer back to the user, focus on the most important information. Only use as much formatting or structure as is required, and avoid long-winded explanations unless necessary. ### Formatting rules Your answer is being rendered by an application for the user. Follow these guidelines to make sure your answer is rendered correctly: - You may format with GitHub-flavored Markdown. - When referencing a real local file, prefer a clickable markdown link. * Clickable file links should look like [app.py](/abs/path/app.py:12): plain label, absolute target, with optional line number inside the target. * If a file path has spaces, wrap the target in angle brackets: [My Report.md](). * Do not wrap markdown links in backticks, or put backticks inside the label or target. This confuses the markdown renderer. * Do not use URIs like file://, vscode://, or https:// for file links. * Do not provide ranges of lines. * Avoid repeating the same filename multiple times when one grouping is clearer. ### Visualizations Use a visualization only when it makes an important relationship materially easier to understand than prose or a short list. Do not add one merely because an answer has components or steps. Good candidates include: - several exact mappings or repeated-field comparisons; - one source, component, or decision affecting three or more downstream consumers or branches; - three or more dependent steps, or state that changes across an event sequence; - hierarchy, ownership, nesting, or layout; - a bug or interaction whose relationships are difficult to explain linearly. Prefer the smallest useful visual: a table for mappings or comparisons, a flow or timeline for sequence or change, a tree for hierarchy or branching, and a wireframe for layout. Usually skip visuals for single facts, one-step actions, simple edits, basic instructions, or information already clear in a short paragraph or list. Compact notation and small examples do not count as visualizations. # Rules for getting work done - When you search for text or files, you reach first for `rg` or `rg --files`; they are much faster than alternatives like `grep`. If `rg` is unavailable, you use the next best tool without fuss. - When possible, prefer parallelization over sequential tool calls, as this will help with round-trip latency and let you get work done faster. - Do not chain shell commands with separators like `echo "====";` or `printf '---'`; the output becomes noisy in a way that makes the user's side of the conversation worse. - Exercise caution when escaping text for exec_command calls - backticks and `$()` passed to the `cmd` argument will still execute. DO NOT use escape sequences that risk accidental exposure of sensitive data in tool call outputs. - Avoid performing blocking sleep or wait calls longer than 60 seconds, as they may prevent you from communicating with the user for their duration. - When declaring env vars or script variables, always avoid common system options. Never repurpose `$HOME`, `$home`, or `$CODEX_HOME`. Instead, use a task-specific variable name. ## File editing constraints Use `apply_patch` for local file edits. Do not create or edit files with `cat` or other shell write tricks. Formatting commands and bulk mechanical rewrites do not need `apply_patch`. Do not use Python to read or write files when a simple shell command or `apply_patch` is enough. You may find yourself working in a dirty worktree. Existing or new changes belong to the user unless you know otherwise, so you preserve them, ignore unrelated edits, and work carefully with anything that overlaps your task. If you cannot work around them you escalate to the user. Never use destructive commands like `git reset --hard` or `git checkout --` unless the user has clearly asked for that operation. If the request is ambiguous, ask for approval first. You prefer non-interactive git commands. ## Autonomy and persistence Adapt accordingly based on the user’s request type. When asked to: - Answer, explain, review, or report status: inspect the task and provide an evidence-backed response. These user requests do not authorize external writes, messages, PR changes, or other expansive mutations unless the user also asks for a change. Reversible, non-mutating diagnostic checks are allowed when they are relevant. - Diagnose: determine the cause and explain it. Do not implement the fix unless the user asks for a fix or the request otherwise clearly includes implementation. - Change or build: implement the requested change, verify it in proportion to risk, and hand off the completed result while a safe, relevant next step remains. - Monitor or wait: use the recurring-monitoring or wait mechanism provided by the product. Unchanged external state is expected and is not by itself a blocker. You avoid inferring authorization for a materially different action to the user’s request. Bias towards taking action in the following circumstances: a) the action is read-only, doesn’t change state, or impacts only the systems, data, and people the user placed in scope. b) the action is a normal implementation step within the requested workflow. You do not need to ask for clarification from the user if your action is scoped within the user’s task and does not cause significant external state change (e.g. tool calls to external applications). A terminal condition such as “finish,” “babysit,” or “do not stop” requires persistence toward the outcome, but does not broaden the set of authorized actions. When blocked, exhaust safe in-scope checks and alternatives. You make informed assumptions that help you make progress towards the user’s task, as long as they don’t result in divergence from the user’s intent and the scope of the task. If an assumption would cause the task or current course of action to change beyond what was specified by the user, make sure to flag the available context, the assumption made, and the reasons for doing so explicitly to the user. When presented with clarifying questions or objections from the user, lead with concrete evidence and diligent reasoning rather than unsubstantiated deference. You communicate your reasoning explicitly and concretely, so decisions and tradeoffs are easy for the user to evaluate upfront. If completion requires new authority, external coordination, or a meaningful expansion beyond the user’s implied intent and task scope (e.g. a missing user choice that would materially change the result), stop the current turn, report the blocker, and request direction from the user rather than assuming permission. # Destructive actions Be cautious with commands or API calls that can delete, overwrite, or otherwise make data difficult to recover. Before taking a destructive action: - Make sure the action is clearly within the user's request. - Resolve the exact targets with read-only checks when necessary. - Do not use `$HOME`, `~`, `/`, a workspace root, or another broad directory as the target of a recursive or destructive command. - When creating temporary directories, prefer using `mktemp -d`, or `New-Item` in Powershell. - When declaring env vars or script variables, always avoid common system options. Never repurpose `$HOME`, `$home`, or `$CODEX_HOME`. Instead, use a task-specific variable name. - When possible, avoid relying on unresolved environment variables, globs, or command substitutions to identify destructive targets. Use explicit, validated paths. - Prefer recoverable operations, such as moving files to trash, when practical. - If the target or scope is unclear, stop and ask the user. Never run commands such as `rm -rf $HOME` or equivalent operations that could erase a home directory, repository, workspace, or other broad collection of user data. After deleting anything material, briefly tell the user what was removed and whether it can be recovered. # Using skills A skill is a set of instructions provided through a `SKILL.md` source. The skills available to you will be listed in the “## Skills” section under “### Available skills”. ### How to use skills - Discovery: When a `## Skills` section is present, it lists the skills available in the current session. Each entry includes a name, description, and location for its `SKILL.md`. The location may be an absolute filesystem path, a short aliased path, or a non-filesystem reference that must be read using its indicated tool or provider. When short aliased paths are used, the available-skills catalog also provides a mapping from aliases such as `r0` to their filesystem roots. Expand the alias before accessing the skill. - Trigger rules: If the user names an available skill (with `$SkillName` or plain text) OR the task clearly matches an available skill's description, you must use that skill for that turn. Multiple mentions mean use them all. Do not carry skills across turns unless re-mentioned. - Missing/blocked: If a named skill is not available or its `SKILL.md` cannot be read, say so briefly and continue with the best fallback. - How to use a skill: 1) After deciding to use a skill, the main agent must read its `SKILL.md` completely before taking task actions. If its location is a short aliased path, expand the matching root alias first from `### Skill roots`, then open and read its `SKILL.md` completely before taking task actions. For a filesystem path, open the file. For an environment-owned file, use the filesystem of the owning environment. For an orchestrator reference, call `skills.list` with `{"authority":{"kind":"orchestrator"}}`, select the matching package, and pass its `main_resource` to `skills.read`. For another non-filesystem reference, use its indicated tool or provider. If a read is truncated or paginated, continue until EOF. 2) When `SKILL.md` references another file or resource, use the same access mechanism. Resolve relative paths against the directory containing a filesystem-backed `SKILL.md`. For orchestrator skills, pass the exact referenced resource identifier with the same authority and package to `skills.read`; do not treat `skill://` identifiers as filesystem paths. 3) If `SKILL.md` points to extra folders such as `references/`, use its routing instructions to identify what is required for the task. The main agent must read each required instruction or reference itself before acting on it. Do not delegate reading, summarizing, or interpreting skill instructions to a subagent. Subagents may still perform task work when the selected skill allows it. 4) For filesystem-backed skills (or if `scripts/` exist), prefer running or patching provided scripts instead of retyping large code blocks. For orchestrator skills, use `skills.read` and the available tools; do not invent a local path. 5) Reuse provided assets or templates through the same access mechanism instead of recreating them (including if `assets/` or templates exist). - Coordination and sequencing: - If multiple skills apply, choose the minimal set that covers the request and state the order you'll use them. - Announce which skills you're using and why. If you skip an obvious skill, say why. - Context hygiene: - Progressive disclosure applies to selecting relevant resources, not partially reading a selected instruction file. Do not load unrelated references, scripts, or assets. - Avoid deep reference-chasing: prefer files or resources directly linked from `SKILL.md` unless blocked. - When variants exist, select only the relevant references and note the choice. - Safety and fallback: If a skill cannot be applied cleanly, state the issue, choose the best alternative, and continue. When the user names a skill in their request, you must add the usage of that skill to your current working plan and use it faithfully. The user's instructions should take precedence over guidelines provided in a skill. Explicitly tell the user in the `commentary` channel whenever a skill causes you to take an action or pause your work. When using a skill the user did not explicitly name, follow this procedure: - First, tell the user in the commentary channel **why** you are using the skill. - Then, use the skill as long as it stays within the scope of the task. - Next, if using the skill resulted in material changes (especially when this requires non-trivial judgment), mention how it influenced your work (but only in the final response). If a skill causes the current turn to pause or otherwise blocks the continuation of the task, cite the skill and provide a concise explanation to the user in your final response. Do not cite skills you merely inspected. ## Step 2 · developer · 2026-09-23T21:40:37.191Z ## Skills A skill is a set of local instructions to follow that is stored in a `SKILL.md` file. Below is the list of skills that can be used. Each entry includes a name, description, and a short path that can be expanded into an absolute path using the skill roots table. ### Skill roots - `r0` = `/tmp/codex-home/skills/.system` ### Available skills - imagegen: Generate or edit raster images when the task benefits from AI-created bitmap visuals such as photos, illustrations, textures, sprites, mockups, or transparent-background cutouts. Use when Codex should create a brand-new image, transform an existing image, or derive visual variants from references, and the output should be a bitmap asset rather than repo-native code or vector. Do not use when the task is better handled by editing existing SVG/vector/code-native assets, extending an established icon or logo system, or building the visual directly in HTML/CSS/canvas. (file: r0/imagegen/SKILL.md) - openai-docs: Use for Codex models/pricing, scheduled tasks, skills, settings, setup, troubleshooting, customization, automations, and self-knowledge—including 'you,' 'your,' 'this app,' or 'this coding agent' when they refer to Codex—and for OpenAI APIs/products and ChatGPT Work. Also use for model choice/migration, prompting, SDKs, Responses, Realtime, agents, evals, and Chat/Work/Codex comparisons. Do not use for generic app/software tasks that merely mention Codex. (file: r0/openai-docs/SKILL.md) - plugin-creator: Create and scaffold plugin directories for Codex with a required `.codex-plugin/plugin.json`, optional plugin folders/files, valid manifest defaults, and personal-marketplace entries by default. Use when Codex needs to create a new personal plugin, add optional plugin structure, generate or update marketplace entries for plugin ordering and availability metadata, or update an existing local plugin during development with the CLI-driven cachebuster and reinstall flow. (file: r0/plugin-creator/SKILL.md) - skill-creator: Create or update a Codex skill with appropriately scoped instructions and any needed supporting resources. (file: r0/skill-creator/SKILL.md) - skill-installer: Install Codex skills into $CODEX_HOME/skills from a curated list or a GitHub repo path. Use when a user asks to list installable skills, install a curated skill, or install a skill from another repo (including private repos). (file: r0/skill-installer/SKILL.md) Filesystem sandboxing defines which files can be read or written. `sandbox_mode` is `danger-full-access`: No filesystem sandboxing - all commands are permitted. Network access is enabled. Approval policy is currently never. Do not provide the `sandbox_permissions` for any reason, commands will be rejected. ## Apps (Connectors) Apps (Connectors) can be explicitly triggered in user messages in the format `[$app-name](app://{connector_id})`. Apps can also be implicitly triggered as long as the context suggests usage of available apps. An app is equivalent to a set of MCP tools within the `codex_apps` MCP. An installed app's MCP tools are either provided to you already, or can be lazy-loaded through the `tool_search` tool. If `tool_search` is available, the apps that are searchable by `tools_search` will be listed by it. Do not additionally call list_mcp_resources or list_mcp_resource_templates for apps. ## Step 3 · developer · 2026-09-23T21:40:37.191Z You are `/root`, the primary agent in a team of agents collaborating to fulfill the user's goals. At the start of your turn, you are the active agent. You can spawn sub-agents to handle subtasks, and those sub-agents can spawn their own sub-agents. All agents in the team, including the agents that you can assign tasks to, are equally intelligent and capable, and have access to the same set of tools. You can use `spawn_agent` to create a new agent, `followup_task` to give an existing agent a new task and trigger a turn, and `send_message` to pass a message to a running agent without triggering a turn. Child agents can also spawn their own sub-agents. You can decide how much context you want to propagate to your sub-agents with the `fork_turns` parameter. You will receive messages in the analysis channel in the form: ``` Message Type: MESSAGE | FINAL_ANSWER Task name: Sender: Payload: ``` They may be addressed as to=/root Note that collaboration tools cannot be called from inside `functions.exec`. Call `spawn_agent`, `send_message`, `followup_task`, `wait_agent`, `interrupt_agent`, and `list_agents` only as direct tool calls using the recipient shown in their tool definitions, such as `to=functions.collaboration.spawn_agent`, since they are intentionally absent from the `functions.exec` `tools.*` namespace. Available tools in `functions.exec` are explicitly described with a `tools` namespace in the developer message. All agents share the same directory. In detail: - All agents have access to the same container and filesystem as you. - All agents use the same current working directory. - As a result, edits made by one agent are immediately visible to all other agents. When calling `wait_agent`, prefer longer waits (minutes) to avoid busy polling. There are 4 available concurrency slots, meaning that up to 4 agents can be active at once, including you. Full-history forks (`fork_turns` omitted or `"all"`) inherit the parent model and reasoning effort and do not accept overrides. Only set `model` or `reasoning_effort` when explicitly requested by the user, applicable `AGENTS.md` instructions, or skill instructions; when doing so, set `fork_turns` to `"none"` or a positive integer string. ## Step 4 · developer · 2026-09-23T21:40:37.191Z Any earlier instruction enabling proactive multi-agent delegation no longer applies. Do not spawn sub-agents unless the user or applicable AGENTS.md/skill instructions explicitly ask for sub-agents, delegation, or parallel agent work. ## Step 5 · user · 2026-09-23T21:40:37.191Z Here is a list of plugins that are available but not installed. - Dropbox (app-69b31dc2110c8191b8b47dc98fe5a052@openai-curated-remote) - Box (box@openai-curated-remote) - Codex Security (codex-security@openai-curated-remote) - Figma (figma@openai-curated-remote) - GitHub (github@openai-curated-remote) - Gmail (gmail@openai-curated-remote) - Google Calendar (google-calendar@openai-curated-remote) - Google Drive (google-drive@openai-curated-remote) - Linear (linear@openai-curated-remote) - Notion (notion@openai-curated-remote) - OpenAI Developers (openai-developers@openai-curated-remote) - Outlook Calendar (outlook-calendar@openai-curated-remote) - Outlook Email (outlook-email@openai-curated-remote) - SharePoint (sharepoint@openai-curated-remote) - Slack (slack@openai-curated-remote) - Teams (teams@openai-curated-remote) /app sh 2026-09-23 Etc/UTC /app ### Harness context { "type": "world_state", "full": true, "state": { "agents_md": {}, "apps_instructions": true, "collaboration_mode": { "mode": "default", "model": "gpt-5.6-sol", "instructions": "dfd53114f5f6f9f5fd7816370d0bf2847806246d" }, "context_window_guidance": "", "environments": { "environments": { "local": { "cwd": "/app", "status": "available", "shell": "sh" } }, "current_date": "2026-09-23", "timezone": "Etc/UTC", "filesystem": "/app" }, "environments_instructions": false, "git_attribution": false, "host_skills": { "body": "\n## Skills\nA skill is a set of local instructions to follow that is stored in a `SKILL.md` file. Below is the list of skills that can be used. Each entry includes a name, description, and a short path that can be expanded into an absolute path using the skill roots table.\n### Skill roots\n- `r0` = `/tmp/codex-home/skills/.system`\n### Available skills\n- imagegen: Generate or edit raster images when the task benefits from AI-created bitmap visuals such as photos, illustrations, textures, sprites, mockups, or transparent-background cutouts. Use when Codex should create a brand-new image, transform an existing image, or derive visual variants from references, and the output should be a bitmap asset rather than repo-native code or vector. Do not use when the task is better handled by editing existing SVG/vector/code-native assets, extending an established icon or logo system, or building the visual directly in HTML/CSS/canvas. (file: r0/imagegen/SKILL.md)\n- openai-docs: Use for Codex models/pricing, scheduled tasks, skills, settings, setup, troubleshooting, customization, automations, and self-knowledge—including 'you,' 'your,' 'this app,' or 'this coding agent' when they refer to Codex—and for OpenAI APIs/products and ChatGPT Work. Also use for model choice/migration, prompting, SDKs, Responses, Realtime, agents, evals, and Chat/Work/Codex comparisons. Do not use for generic app/software tasks that merely mention Codex. (file: r0/openai-docs/SKILL.md)\n- plugin-creator: Create and scaffold plugin directories for Codex with a required `.codex-plugin/plugin.json`, optional plugin folders/files, valid manifest defaults, and personal-marketplace entries by default. Use when Codex needs to create a new personal plugin, add optional plugin structure, generate or update marketplace entries for plugin ordering and availability metadata, or update an existing local plugin during development with the CLI-driven cachebuster and reinstall flow. (file: r0/plugin-creator/SKILL.md)\n- skill-creator: Create or update a Codex skill with appropriately scoped instructions and any needed supporting resources. (file: r0/skill-creator/SKILL.md)\n- skill-installer: Install Codex skills into $CODEX_HOME/skills from a curated list or a GitHub repo path. Use when a user asks to list installable skills, install a curated skill, or install a skill from another repo (including private repos). (file: r0/skill-installer/SKILL.md)\n", "includeInstructions": true }, "managed_developer_instructions": {}, "model": "gpt-5.6-sol", "multi_agent_mode": { "mode": "explicitRequestOnly", "usage_hint_hash": "0e2a3174d5f40de49ed383507497d69bbff42c5d" }, "multi_agent_usage_hint": "0e2a3174d5f40de49ed383507497d69bbff42c5d", "orchestrator_skills": { "includeInstructions": true, "enabled": false }, "permissions": { "instructions": "32ca25d6d85edaeb6f1e19b2a5cc4e08d2a631cd", "approved_command_prefixes": [] }, "persistent_mode": {}, "personality": { "model": "gpt-5.6-sol", "personality": "pragmatic" }, "plugins_instructions": false, "realtime": { "active": false }, "skills": { "includeInstructions": true } } } ### Harness context { "type": "turn_context", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "cwd": "/app", "workspace_roots": [ "/app" ], "current_date": "2026-09-23", "timezone": "Etc/UTC", "approval_policy": "never", "approvals_reviewer": "user", "sandbox_policy": { "type": "danger-full-access" }, "permission_profile": { "type": "disabled" }, "model": "gpt-5.6-sol", "comp_hash": "3000", "personality": "pragmatic", "collaboration_mode": { "mode": "default", "settings": { "model": "gpt-5.6-sol", "reasoning_effort": "high", "developer_instructions": null } }, "multi_agent_version": "v2", "realtime_active": false, "effort": "high", "summary": "auto" } ## Step 6 · user · 2026-09-23T21:40:37.211Z # Improve a production music-discovery two-tower You have joined the recommendations team for a music streaming service. The "Made for You" shelf is served by a mature production two-tower model. Its chronological data protocol and indexed serving path are sound, but its offline retrieval quality no longer clears the team's next launch gate. Your job is to investigate the production model, improve its retrieval quality, and ship a better ranking artifact. Use the implementation and public validation data to form and test your own diagnosis. The source used to reproduce the production model is included under `/task/current_model/`. You may copy it into `/app/solution/`, edit it, add tests, and improve its training objective, but keep the data protocol, two-tower serving contract, and evaluation boundary intact. ## Production Context The model must satisfy a strict request-time latency budget. Item vectors are precomputed offline. At request time, one user vector is computed from observed interaction history and compared with candidate item vectors by a batchable two-tower score. Do not introduce a cross-encoder, per-candidate sequence model, or user-ID lookup table. The current trainer is a mature baseline with chronological internal validation. Focus your investigation on how its training objective selects and uses negative examples. Diagnose limitations in the current negative-sampling strategy and improve it under the fixed CPU budget. Validate changes with the public backtest. The final approach must still train and rank within the supplied CPU environment while preserving the serving and data boundaries above. ## What You Have All public inputs are under `/task/data/`. A stage cutoff is the timestamp at which observed history and candidate eligibility are frozen for a ranking. The public validation stage cutoff is `24786800`, when `train_*` ends. A 30-minute gap precedes the seven-day `val_*` window. For the final submission, that validation window becomes observed history, and another 30-minute gap precedes the hidden seven-day outcome window. The package includes: - `/task/current_model/train_current_model.py`: the production training and ranking script. It can reproduce the public validation ranking and produce a hidden-test submission after refitting. - `/task/current_model/two_tower_model.py`: model primitives used by the production script. - `/task/evaluate_public.py`: the public validation evaluator for development. - `/task/data/validation_eligible_candidates.npz` and `/task/data/test_eligible_candidates.npz`: platform-owned candidate sets for the validation and hidden-test cutoffs. - `/task/data/validation_preference_state.parquet` and `/task/data/test_preference_state.parquet`: active explicit preference state at the corresponding cutoffs. - `/task/requirements.txt`: the exact offline Python distribution inventory. You can reproduce the production public backtest with: ```sh python /task/current_model/train_current_model.py \ --stage validation \ --public-dir /task \ --output /app/solution/production_validation.parquet python /task/evaluate_public.py /app/solution/production_validation.parquet ``` ## Data For each event family there is a `train_*.parquet` and `val_*.parquet` file: | Family | Meaning | Columns | | --- | --- | --- | | `listens` | Playback events | `uid`, `timestamp`, `item_id`, `is_organic`, `played_ratio_pct`, `track_length_seconds` | | `likes` | Explicit positive actions | `uid`, `timestamp`, `item_id`, `is_organic` | | `dislikes` | Explicit negative actions | `uid`, `timestamp`, `item_id`, `is_organic` | | `unlikes` | Reversal of a prior like | `uid`, `timestamp`, `item_id`, `is_organic` | | `undislikes` | Reversal of a prior dislike | `uid`, `timestamp`, `item_id`, `is_organic` | `is_organic=1` means the listener sought out the track; `0` means the action came through a recommendation surface. A listen is a conventional positive at 50% completion. The discovery-quality objective below uses the stronger 80% threshold. The two public windows have different roles: 1. For model development and selection, train only from `train_*` and score the subsequent `val_*` outcomes. 2. After selecting an improvement, refit it on `train_* + val_*`. At hidden-test time the validation events are observed history, not recommendable outcomes. Do not use `val_*` events as features when measuring a validation ranking. They may and should be used when refitting the final hidden-test ranker. Additional files under `/task/data/`: - `candidate_catalog.parquet`: the 30,000 retrieval-catalog tracks, ordered by training positive-listen popularity. - `target_users.parquet`: users with at least 20 positive listens in the 90 days before the training cutoff, selected without future labels. - `validation_preference_state.parquet`: active explicit state at the training cutoff, for validation ranking. - `test_preference_state.parquet`: active explicit state after validation, for the final hidden-test ranking. State is `liked` or `disliked`; a pair may have both active channels. - `validation_eligible_candidates.npz` and `test_eligible_candidates.npz`: cutoff-correct candidate sets for every target user. Each contains aligned arrays `uids`, `item_ids`, and `packed_eligible`. For user row `r`, recover the Boolean item mask with `np.unpackbits(packed_eligible[r], count=len(item_ids), bitorder="little")`. Validation candidates exclude all `train_*` encounters. Test candidates exclude all `train_*` and `val_*` encounters. Future test interactions are hidden and used only by the separate Harbor verifier. ## Discovery Objective Rank only the candidates returned for the relevant cutoff. Relevance is based on organic behavior in the immediately following window: - grade 3: the user organically likes the track; - grade 1: the user organically listens to at least 80% of the track; - grade 0: otherwise. If both positive events occur, grade 3 wins. Ranking quality is measured with graded NDCG@10. DCG uses gain `2^grade - 1` and discount `1/log2(rank + 1)`, then averages per-user NDCG over users with at least one relevant item. The public evaluator reports this same objective for development, but its score is not a separate acceptance stage. Final acceptance is determined on the hidden test using the same objective. The Yambda logs contain interactions, not impression propensities; treat the organic objective as a robust offline target, not as a causal estimate of online lift. ## Deliverable Submit one final ranking as `/app/solution/submission.parquet` or `/app/solution/submission.csv`. It must be a regular file, not a symbolic link. If both files exist, the verifier evaluates `submission.parquet` and ignores `submission.csv`. The ranking must: - include the columns `uid`, `item_id`, and `rank`; only these columns are evaluated; - use finite, integer-valued entries in all three required columns; - cover exactly the users in `target_users.parquet`, with no missing or extra users; - contain exactly 100 rows and 100 distinct items for every target user; - contain every integer rank from 1 through 100 exactly once per user; and - use only items present in that user's `test_eligible_candidates.npz` candidate set. Also leave the improved implementation used to build the artifact at `/app/solution/train_current_model.py`, along with any local modules it imports. A concise `/app/solution/README.md` with the diagnosis, before-and-after public score, model change, and submission command is useful for the experiment record, but it is not an automated acceptance gate. ## Constraints - Write deliverables and intermediate artifacts only under `/app/solution/`. - Treat `/task/` and the installed Python environment as read-only. - Do not invoke nested agents or attempt to access verifier files, credentials, other trials, or host paths. - Do not install packages or use network access except for the model-provider connection managed by Harbor. - Do not alter cutoff definitions, target users, candidate eligibility, or relevance labels. - Improve the production pipeline in place. Do not substitute an unrelated model family or evade the indexed two-tower serving constraint. - The environment includes CPU PyTorch 2.8.0. No accelerator is available. - You have up to 60 minutes. Prioritize measured validation improvements, a correct final refit, and a valid submission over broad architecture search. - Keep the best valid submission saved throughout the attempt so it survives the deadline. ## Step 7 · agent · 2026-09-23T21:40:39.060Z ### Thinking unavailable — no text recorded I’ll reproduce the baseline, inspect the objective and data statistics, then focus experiments on negative selection while continuously keeping a valid best artifact under `/app/solution/`. I’ll preserve the chronological split, eligible candidate boundary, and two-tower serving interface. ### exec · 2026-09-23T21:40:44.688Z { "code": "const r = await tools.exec_command({cmd:\"sed -n '1,260p' /task/current_model/train_current_model.py && sed -n '1,260p' /task/current_model/two_tower_model.py && sed -n '1,220p' /task/evaluate_public.py && find /task/data -maxdepth 1 -type f -printf '%f %s\\n' | sort\",\"workdir\":\"/app\",\"yield_time_ms\":10000,\"max_output_tokens\":30000}); text(r.output)\n" } ### Tool output · 2026-09-23T21:40:44.761Z Script completed Wall time 0.1 seconds Output: #!/usr/bin/env python3 """Train the Yambda windowed two-tower baseline. Every catalog listen with at least 50 percent completion is a sequence token. Within each selected chronological window, every adjacent target contributes a loss. The fast default retains each user's most recent 128 training targets and 16 held-out validation targets; passing zero for either cap restores the uncapped behavior for that side of the split. A 100-step truncated-BPTT block computes all of its timestep losses and carries the detached GRU hidden state into the next block. The model is a pure two-tower retriever: no user-ID embedding, no output normalization, raw dot-product retrieval, sample-weighted binary cross entropy, and 24 uniform plus eight propensity-corrected unique in-batch negatives. Every selected adjacent target retains a nonzero weight. Only files under the supplied public directory are read. """ from __future__ import annotations import argparse import json import random import sys import time from dataclasses import asdict, dataclass from pathlib import Path import numpy as np import pandas as pd import torch from torch import nn from torch.nn import functional as F import two_tower_model as base CACHE_VERSION = 2 @dataclass(frozen=True) class Config: bptt_steps: int = 100 user_batch_size: int = 64 embedding_dim: int = 192 hidden_dim: int = 192 user_hidden_1: int = 512 user_hidden_2: int = 256 item_hidden_1: int = 512 item_hidden_2: int = 256 dropout: float = 0.05 epochs: int = 1 learning_rate: float = 1.0e-3 weight_decay: float = 1.0e-5 gradient_clip: float = 2.0 loss_microbatch_size: int = 65_536 uniform_negatives: int = 24 inbatch_negatives: int = 8 inbatch_correction_power: float = 0.5 inbatch_correction_min: float = 0.25 inbatch_correction_max: float = 4.0 negative_filter_scope: str = "full-training-history" target_weighting: str = "organic-strong" ordinary_target_weight: float = 0.25 organic_strong_target_weight: float = 1.0 organic_like_target_weight: float = 3.0 discovery_horizon_days: int = 7 validation_fraction: float = 0.10 max_train_targets_per_user: int = 128 max_validation_targets_per_user: int = 16 early_stopping_patience: int = 1 early_stopping_min_delta: float = 1.0e-4 seed: int = 29 @dataclass(frozen=True) class CandidateSet: uids: np.ndarray item_ids: np.ndarray packed: np.ndarray @classmethod def read(cls, path: Path) -> "CandidateSet": with np.load(path, allow_pickle=False) as artifact: result = cls( uids=artifact["uids"].astype(np.int64, copy=True), item_ids=artifact["item_ids"].astype(np.int64, copy=True), packed=artifact["packed_eligible"].astype(np.uint8, copy=True), ) expected = (len(result.uids), (len(result.item_ids) + 7) // 8) if result.packed.shape != expected: raise ValueError( f"invalid candidate artifact shape {result.packed.shape}; " f"expected {expected}" ) return result @dataclass(frozen=True) class SequenceData: item_ids: np.ndarray item_features: np.ndarray user_ids: np.ndarray offsets: np.ndarray sequence_timestamps: np.ndarray sequence_items: np.ndarray event_features: np.ndarray activity_features: np.ndarray state_ids: np.ndarray liked_states: np.ndarray disliked_states: np.ndarray state_counts: np.ndarray inference_user_rows: np.ndarray inference_liked_items: np.ndarray inference_disliked_items: np.ndarray inference_user_features: np.ndarray @property def lengths(self) -> np.ndarray: return np.diff(self.offsets) @property def target_count(self) -> int: return int(np.maximum(self.lengths - 1, 0).sum()) @dataclass(frozen=True) class TargetPartition: """A contiguous recent target window and its chronological BCE split.""" window_starts: np.ndarray training_counts: np.ndarray validation_counts: np.ndarray history_training_counts: np.ndarray @property def selected_count(self) -> int: return int(self.training_counts.sum() + self.validation_counts.sum()) def log(message: str) -> None: print(message, file=sys.stderr, flush=True) def seed_everything(seed: int) -> None: random.seed(seed) np.random.seed(seed) torch.manual_seed(seed) def model_config(config: Config) -> base.TowerConfig: """Map the dense trainer configuration onto the unchanged tower.""" return base.TowerConfig( sequence_length=config.bptt_steps, embedding_dim=config.embedding_dim, hidden_dim=config.hidden_dim, user_hidden_1=config.user_hidden_1, user_hidden_2=config.user_hidden_2, item_hidden_1=config.item_hidden_1, item_hidden_2=config.item_hidden_2, dropout=config.dropout, epochs=config.epochs, learning_rate=config.learning_rate, weight_decay=config.weight_decay, gradient_clip=config.gradient_clip, uniform_negatives=config.uniform_negatives, inbatch_negatives=config.inbatch_negatives, inbatch_correction_power=config.inbatch_correction_power, inbatch_correction_min=config.inbatch_correction_min, inbatch_correction_max=config.inbatch_correction_max, seed=config.seed, ) def append_state_snapshot( active_likes: dict[int, int], active_dislikes: dict[int, int], n_items: int, liked_states: list[np.ndarray], disliked_states: list[np.ndarray], state_counts: list[tuple[int, int]], ) -> int: liked_states.append(base.pack_active_items(active_likes, base.LIKE_ITEMS, n_items)) disliked_states.append( base.pack_active_items(active_dislikes, base.DISLIKE_ITEMS, n_items) ) state_counts.append((len(active_likes), len(active_dislikes))) return len(liked_states) - 1 def causal_activity_features( timestamps: np.ndarray, items: np.ndarray, organic: np.ndarray, completion: np.ndarray, ) -> np.ndarray: """Compute the first four reviewed user features at every event cutoff.""" length = len(items) result = np.zeros((length, 4), dtype=np.float16) if not length: return result left_rows = np.searchsorted( timestamps, timestamps - base.PROFILE_LOOKBACK_DAYS * base.DAY, side="left", ) rows = np.arange(length, dtype=np.int64) counts = rows - left_rows + 1 organic_sum = np.cumsum(organic.astype(np.float64)) completion_sum = np.cumsum(np.minimum(completion, 100).astype(np.float64)) before_organic = np.where( left_rows > 0, organic_sum[np.maximum(left_rows - 1, 0)], 0.0 ) before_completion = np.where( left_rows > 0, completion_sum[np.maximum(left_rows - 1, 0)], 0.0 ) unique_counts = np.empty(length, dtype=np.int32) frequencies: dict[int, int] = {} left = 0 for right, raw_item in enumerate(items): item = int(raw_item) frequencies[item] = frequencies.get(item, 0) + 1 required_left = int(left_rows[right]) while left < required_left: old_item = int(items[left]) remaining = frequencies[old_item] - 1 if remaining: frequencies[old_item] = remaining else: del frequencies[old_item] left += 1 unique_counts[right] = len(frequencies) result[:, 0] = (np.log1p(counts) / 8.0).astype(np.float16) result[:, 1] = (np.log1p(unique_counts) / 6.0).astype(np.float16) result[:, 2] = ( (organic_sum - before_organic) / np.maximum(counts, 1) ).astype(np.float16) result[:, 3] = ( (completion_sum - before_completion) / np.maximum(counts, 1) / 100.0 ).astype(np.float16) return result def build_sequence_parts( listens: base.ListenEvents, explicit: base.ExplicitEvents, n_items: int, liked_states: list[np.ndarray], disliked_states: list[np.ndarray], state_counts: list[tuple[int, int]], ) -> tuple[np.ndarray, np.ndarray, np.ndarray, np.ndarray, np.ndarray] | None: qualifying = listens.completion_pct >= base.LISTEN_POSITIVE_THRESHOLD timestamps = listens.timestamps[qualifying].astype(np.int64, copy=False) items = listens.items[qualifying].astype(np.uint16, copy=False) organic = listens.organic[qualifying].astype(np.float32, copy=False) completion = listens.completion_pct[qualifying].astype(np.float32, copy=False) if not len(items): """Shared public-data primitives for the Yambda two-tower baseline.""" from __future__ import annotations import sys from dataclasses import dataclass from pathlib import Path from typing import Iterator import numpy as np import pandas as pd import pyarrow.parquet as pq import torch from torch import nn DAY = 86_400 TRAIN_END = 24_786_800 VALIDATION_END = 25_393_400 LISTEN_POSITIVE_THRESHOLD = 50 PROFILE_LOOKBACK_DAYS = 120 LIKE_ITEMS = 48 DISLIKE_ITEMS = 24 TOP_N = 100 @dataclass(frozen=True) class TowerConfig: sequence_length: int = 100 embedding_dim: int = 192 hidden_dim: int = 192 user_hidden_1: int = 512 user_hidden_2: int = 256 item_hidden_1: int = 512 item_hidden_2: int = 256 dropout: float = 0.05 epochs: int = 1 learning_rate: float = 1.0e-3 weight_decay: float = 1.0e-5 gradient_clip: float = 2.0 uniform_negatives: int = 24 inbatch_negatives: int = 8 inbatch_correction_power: float = 0.5 inbatch_correction_min: float = 0.25 inbatch_correction_max: float = 4.0 seed: int = 29 @dataclass(frozen=True) class ListenEvents: timestamps: np.ndarray items: np.ndarray organic: np.ndarray completion_pct: np.ndarray @dataclass(frozen=True) class ExplicitEvents: timestamps: np.ndarray items: np.ndarray channel: np.ndarray active: np.ndarray organic_like: np.ndarray def log(message: str) -> None: print(message, file=sys.stderr, flush=True) def build_item_features(catalog: pd.DataFrame) -> np.ndarray: """Return four standardized features built only from the public catalog.""" positives = catalog.positive_listens.to_numpy(dtype=np.float64, copy=False) organic = catalog.organic_positive_listens.to_numpy(dtype=np.float64, copy=False) popularity_rank = catalog.popularity_rank.to_numpy(dtype=np.float64, copy=False) features = np.column_stack( [ np.log1p(positives), np.log1p(organic), organic / np.maximum(positives, 1.0), 1.0 - (popularity_rank - 1.0) / max(len(catalog) - 1, 1), ] ) means = features.mean(axis=0, keepdims=True) scales = np.maximum(features.std(axis=0, keepdims=True), 1.0e-6) standardized = ((features - means) / scales).astype(np.float32) if not np.isfinite(standardized).all(): raise RuntimeError("catalog features contain non-finite values") return standardized def _combine_listen_chunks(parts: list[ListenEvents]) -> ListenEvents: if len(parts) == 1: return parts[0] timestamps = np.concatenate([part.timestamps for part in parts]) items = np.concatenate([part.items for part in parts]) organic = np.concatenate([part.organic for part in parts]) completion = np.concatenate([part.completion_pct for part in parts]) order = np.argsort(timestamps, kind="stable") return ListenEvents( timestamps=timestamps[order], items=items[order], organic=organic[order], completion_pct=completion[order], ) def iter_listen_users( path: Path, item_index: pd.Index ) -> Iterator[tuple[int, ListenEvents]]: """Stream one uid-sorted public listen file one user at a time.""" parquet = pq.ParquetFile(path) pending_uid: int | None = None pending: list[ListenEvents] = [] previous_uid = -1 for batch in parquet.iter_batches( batch_size=750_000, columns=["uid", "timestamp", "item_id", "is_organic", "played_ratio_pct"], ): frame = batch.to_pandas() mapped = item_index.get_indexer(frame.item_id.to_numpy(dtype=np.int64)) keep = mapped >= 0 if not np.any(keep): continue uids = frame.uid.to_numpy(dtype=np.int64, copy=False)[keep] timestamps = frame.timestamp.to_numpy(dtype=np.int64, copy=False)[keep] items = mapped[keep].astype(np.int32, copy=False) organic = frame.is_organic.to_numpy(dtype=np.uint8, copy=False)[keep] completion = frame.played_ratio_pct.to_numpy(dtype=np.uint16, copy=False)[keep] if np.any(uids[1:] < uids[:-1]): raise RuntimeError(f"{path.name} is not sorted by uid") boundaries = np.r_[ 0, np.flatnonzero(uids[1:] != uids[:-1]) + 1, len(uids), ] for start, end in zip(boundaries[:-1], boundaries[1:]): uid = int(uids[start]) part = ListenEvents( timestamps[start:end].copy(), items[start:end].copy(), organic[start:end].copy(), completion[start:end].copy(), ) if pending_uid is None: pending_uid = uid elif uid != pending_uid: if pending_uid < previous_uid: raise RuntimeError(f"{path.name} user order regressed") yield pending_uid, _combine_listen_chunks(pending) previous_uid = pending_uid pending_uid = uid pending = [] pending.append(part) if pending_uid is not None: yield pending_uid, _combine_listen_chunks(pending) def merge_listen_streams( paths: list[Path], item_index: pd.Index ) -> Iterator[tuple[int, ListenEvents]]: """Merge uid-sorted public listen files without materializing them.""" streams = [iter(iter_listen_users(path, item_index)) for path in paths] heads: list[tuple[int, ListenEvents] | None] = [ next(stream, None) for stream in streams ] while any(head is not None for head in heads): uid = min(head[0] for head in heads if head is not None) parts: list[ListenEvents] = [] for position, head in enumerate(heads): if head is not None and head[0] == uid: parts.append(head[1]) heads[position] = next(streams[position], None) yield uid, _combine_listen_chunks(parts) def load_explicit_events( data: Path, prefixes: tuple[str, ...], item_index: pd.Index, ) -> dict[int, ExplicitEvents]: """Load public explicit actions as chronological state changes.""" specifications = ( ("likes", 0, 1, 0), ("unlikes", 0, 0, 1), ("dislikes", 1, 1, 0), ("undislikes", 1, 0, 1), ) parts: list[pd.DataFrame] = [] for family, channel, active, tie_priority in specifications: for prefix in prefixes: frame = pd.read_parquet( data / f"{prefix}_{family}.parquet", columns=["uid", "timestamp", "item_id", "is_organic"], ) mapped = item_index.get_indexer( frame.item_id.to_numpy(dtype=np.int64, copy=False) ) keep = mapped >= 0 if not np.any(keep): continue retained = frame.loc[keep, ["uid", "timestamp", "is_organic"]].copy() retained["item"] = mapped[keep].astype(np.int32, copy=False) retained["channel"] = np.int8(channel) retained["active"] = np.int8(active) retained["tie_priority"] = np.int8(tie_priority) retained["organic_like"] = np.int8( family == "likes" ) * retained.is_organic.astype(np.int8) parts.append(retained.drop(columns="is_organic")) if not parts: return {} events = pd.concat(parts, ignore_index=True) events = events.sort_values( ["uid", "timestamp", "tie_priority"], kind="mergesort" ).reset_index(drop=True) result: dict[int, ExplicitEvents] = {} for uid, rows in events.groupby("uid", sort=False): result[int(uid)] = ExplicitEvents( timestamps=rows.timestamp.to_numpy(dtype=np.int64, copy=True), items=rows.item.to_numpy(dtype=np.int32, copy=True), channel=rows.channel.to_numpy(dtype=np.int8, copy=True), active=rows.active.to_numpy(dtype=np.int8, copy=True), organic_like=rows.organic_like.to_numpy(dtype=np.int8, copy=True), ) log(f"loaded explicit events: rows={len(events):,} users={len(result):,}") return result def empty_explicit_events() -> ExplicitEvents: return ExplicitEvents( timestamps=np.empty(0, dtype=np.int64), items=np.empty(0, dtype=np.int32), channel=np.empty(0, dtype=np.int8), active=np.empty(0, dtype=np.int8), organic_like=np.empty(0, dtype=np.int8), ) def pack_active_items( active: dict[int, int], width: int, padding_item: int ) -> np.ndarray: packed = np.full(width, padding_item, dtype=np.uint16) if not active: return packed ordered = sorted(active.items(), key=lambda pair: (-pair[1], pair[0]))[:width] packed[: len(ordered)] = np.fromiter( (item for item, _ in ordered), dtype=np.uint16, count=len(ordered) ) return packed def load_inference_state( path: Path, item_index: pd.Index, uids: np.ndarray, n_items: int, ) -> tuple[np.ndarray, np.ndarray, np.ndarray, np.ndarray]: """Pack the task-provided active explicit state.""" state = pd.read_parquet(path, columns=["uid", "item_id", "state"]) mapped = item_index.get_indexer(state.item_id.to_numpy(dtype=np.int64)) keep = mapped >= 0 #!/usr/bin/env python3 """Score a validation-stage ranking against public discovery labels. ``build_task.py`` publishes this module with the solver-visible task files. It loads target users, validation eligibility, and validation-window events from the adjacent ``data`` directory, then evaluates one ranking supplied on the command line. Stage-independent mechanics come from the adjacent public ``ranking_evaluation.py`` module. The builder installs the same checked-in module in the private judge, so public and private scoring mechanics cannot drift. A relevant candidate receives grade 3 for an organic like or grade 1 for an organic listen with at least 80 percent completion; a like takes precedence when both events exist. Before scoring, the ranking must contain exactly 100 distinct eligible items for every target user, with integer-valued ``uid``, ``item_id``, and ``rank`` columns and ranks 1 through 100 exactly once per user. Extra columns are ignored. Quality is graded NDCG@10, averaged only over users who have at least one eligible relevant item in the validation window. The evaluator prints a JSON object containing the model path and scores. It does not apply the task's pass threshold; its purpose is model development and selection. The private judge applies the threshold to the final submission. Usage:: python evaluate_public.py """ from __future__ import annotations import json import sys from pathlib import Path import pandas as pd from ranking_evaluation import ( CandidateSet, RankingValidationError, ranked_items, read_ranking, score_rankings, validate_ranking, ) HERE = Path(__file__).resolve().parent DATA = HERE / "data" LISTEN_STRONG = 80 def validation_truth( eligibility: CandidateSet, targets: set[int] ) -> dict[int, dict[int, int]]: """Build cutoff-correct graded relevance from public validation events. Only target-user events for eligible candidates are retained. Organic listens completed to at least 80 percent receive grade 1, and organic likes receive grade 3. Repeated user-item events are collapsed, and processing likes second ensures that grade 3 wins over grade 1. Args: eligibility: Validation-cutoff candidate membership service. targets: Complete set of target user IDs. Returns: A nested ``uid -> item_id -> grade`` mapping. Users without an eligible relevant event are omitted. """ listens = pd.read_parquet(DATA / "val_listens.parquet") likes = pd.read_parquet(DATA / "val_likes.parquet") strong = listens[ listens.uid.isin(targets) & (listens.is_organic == 1) & (listens.played_ratio_pct >= LISTEN_STRONG) ][["uid", "item_id"]].drop_duplicates() organic_likes = likes[ likes.uid.isin(targets) & (likes.is_organic == 1) ][["uid", "item_id"]].drop_duplicates() graded: dict[int, dict[int, int]] = {} for raw_uid, raw_item in strong.itertuples(index=False, name=None): uid, item = int(raw_uid), int(raw_item) if eligibility.is_eligible(uid, item): graded.setdefault(uid, {})[item] = 1 for raw_uid, raw_item in organic_likes.itertuples(index=False, name=None): uid, item = int(raw_uid), int(raw_item) if eligibility.is_eligible(uid, item): graded.setdefault(uid, {})[item] = 3 return graded def load_submission( path: Path, eligibility: CandidateSet, targets: set[int] ) -> dict[int, list[int]]: """Load and validate a public validation ranking. Files ending in ``.parquet`` are read as parquet; every other suffix is read as CSV. The required columns must be integer-valued, cover exactly the target-user set, contain 100 rows and ranks 1 through 100 per user, avoid duplicate user-item pairs, and contain only cutoff-eligible items. Args: path: Ranking file to read. eligibility: Validation-cutoff candidate membership service. targets: Exact set of users the ranking must cover. Returns: A ``uid -> ranked item IDs`` mapping ordered by ascending rank. Raises: ValueError: If the ranking violates the required schema or invariants. """ frame = validate_ranking(read_ranking(path), targets) if not all( eligibility.is_eligible(uid, item) for uid, item in frame[["uid", "item_id"]].itertuples(index=False, name=None) ): raise RankingValidationError( "submission contains an item rejected by eligibility service" ) return ranked_items(frame) def score( ranked: dict[int, list[int]], graded: dict[int, dict[int, int]], ) -> dict[str, float | int]: """Aggregate per-user NDCG@10 over users with public relevance labels. Args: ranked: Ranked item IDs for every target user. graded: Eligible validation relevance keyed by user and item. Returns: The six-decimal ``quality_ndcg@10`` value and number of scored users. """ return score_rankings(ranked, graded) def main() -> None: """Run the public evaluator CLI and print its JSON score report.""" targets_frame = pd.read_parquet(DATA / "target_users.parquet") targets = set(targets_frame.uid.astype(int)) eligibility = CandidateSet(DATA / "validation_eligible_candidates.npz") graded = validation_truth(eligibility, targets) if len(sys.argv) != 2: raise SystemExit( "usage: evaluate_public.py " ) path = Path(sys.argv[1]) ranked = load_submission(path, eligibility, targets) print(json.dumps({"model": str(path), "scores": score(ranked, graded)}, indent=2)) if __name__ == "__main__": main() candidate_catalog.parquet 349352 target_users.parquet 84127 test_eligible_candidates.npz 7736341 test_preference_state.parquet 1092329 train_dislikes.parquet 857213 train_likes.parquet 5374652 train_listens.parquet 319183255 train_undislikes.parquet 155988 train_unlikes.parquet 1855885 val_dislikes.parquet 36571 val_likes.parquet 298484 val_listens.parquet 9947609 val_undislikes.parquet 7845 val_unlikes.parquet 72536 validation_eligible_candidates.npz 7573821 validation_preference_state.parquet 1061761 ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44755842487d2a63d87cf5bbcaf58", "usage": { "input_tokens": 14900, "cached_input_tokens": 11136, "cache_write_input_tokens": 0, "output_tokens": 201, "reasoning_output_tokens": 20, "total_tokens": 15101 }, "turn_token_usage": { "input_tokens": 14900, "cached_input_tokens": 11136, "cache_write_input_tokens": 0, "output_tokens": 201, "reasoning_output_tokens": 20, "total_tokens": 15101 }, "thread_token_usage": { "input_tokens": 14900, "cached_input_tokens": 11136, "cache_write_input_tokens": 0, "output_tokens": 201, "reasoning_output_tokens": 20, "total_tokens": 15101 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-b4841a2a-5d15-4b47-8908-83d8e98dbd13", "process_id": "24776", "command": [ "/bin/sh", "-lc", "sed -n '1,260p' /task/current_model/train_current_model.py && sed -n '1,260p' /task/current_model/two_tower_model.py && sed -n '1,220p' /task/evaluate_public.py && find /task/data -maxdepth 1 -type f -printf '%f %s\n' | sort" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "read", "cmd": "sed -n '1,260p' /task/current_model/train_current_model.py", "name": "train_current_model.py", "path": "/task/current_model/train_current_model.py" }, { "type": "read", "cmd": "sed -n '1,260p' /task/current_model/two_tower_model.py", "name": "two_tower_model.py", "path": "/task/current_model/two_tower_model.py" }, { "type": "read", "cmd": "sed -n '1,220p' /task/evaluate_public.py", "name": "evaluate_public.py", "path": "/task/evaluate_public.py" }, { "type": "list_files", "cmd": "find /task/data -maxdepth 1 -type f -printf '%f %s\n'", "path": "data" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "#!/usr/bin/env python3\n\"\"\"Train the Yambda windowed two-tower baseline.\n\nEvery catalog listen with at least 50 percent completion is a sequence token.\nWithin each selected chronological window, every adjacent target contributes a\nloss. The fast default retains each user's most recent 128 training targets and\n16 held-out validation targets; passing zero for either cap restores the\nuncapped behavior for that side of the split. A 100-step truncated-BPTT block\ncomputes all of its timestep losses and carries the detached GRU hidden state\ninto the next block.\n\nThe model is a pure two-tower retriever: no user-ID embedding, no output\nnormalization, raw dot-product retrieval, sample-weighted binary cross entropy,\nand 24 uniform plus eight propensity-corrected unique in-batch negatives. Every\nselected adjacent target retains a nonzero weight. Only files under the supplied\npublic directory are read.\n\"\"\"\nfrom __future__ import annotations\n\nimport argparse\nimport json\nimport random\nimport sys\nimport time\nfrom dataclasses import asdict, dataclass\nfrom pathlib import Path\n\nimport numpy as np\nimport pandas as pd\nimport torch\nfrom torch import nn\nfrom torch.nn import functional as F\n\nimport two_tower_model as base\n\n\nCACHE_VERSION = 2\n\n\n@dataclass(frozen=True)\nclass Config:\n bptt_steps: int = 100\n user_batch_size: int = 64\n embedding_dim: int = 192\n hidden_dim: int = 192\n user_hidden_1: int = 512\n user_hidden_2: int = 256\n item_hidden_1: int = 512\n item_hidden_2: int = 256\n dropout: float = 0.05\n epochs: int = 1\n learning_rate: float = 1.0e-3\n weight_decay: float = 1.0e-5\n gradient_clip: float = 2.0\n loss_microbatch_size: int = 65_536\n uniform_negatives: int = 24\n inbatch_negatives: int = 8\n inbatch_correction_power: float = 0.5\n inbatch_correction_min: float = 0.25\n inbatch_correction_max: float = 4.0\n negative_filter_scope: str = \"full-training-history\"\n target_weighting: str = \"organic-strong\"\n ordinary_target_weight: float = 0.25\n organic_strong_target_weight: float = 1.0\n organic_like_target_weight: float = 3.0\n discovery_horizon_days: int = 7\n validation_fraction: float = 0.10\n max_train_targets_per_user: int = 128\n max_validation_targets_per_user: int = 16\n early_stopping_patience: int = 1\n early_stopping_min_delta: float = 1.0e-4\n seed: int = 29\n\n\n@dataclass(frozen=True)\nclass CandidateSet:\n uids: np.ndarray\n item_ids: np.ndarray\n packed: np.ndarray\n\n @classmethod\n def read(cls, path: Path) -> \"CandidateSet\":\n with np.load(path, allow_pickle=False) as artifact:\n result = cls(\n uids=artifact[\"uids\"].astype(np.int64, copy=True),\n item_ids=artifact[\"item_ids\"].astype(np.int64, copy=True),\n packed=artifact[\"packed_eligible\"].astype(np.uint8, copy=True),\n )\n expected = (len(result.uids), (len(result.item_ids) + 7) // 8)\n if result.packed.shape != expected:\n raise ValueError(\n f\"invalid candidate artifact shape {result.packed.shape}; \"\n f\"expected {expected}\"\n )\n return result\n\n\n@dataclass(frozen=True)\nclass SequenceData:\n item_ids: np.ndarray\n item_features: np.ndarray\n user_ids: np.ndarray\n offsets: np.ndarray\n sequence_timestamps: np.ndarray\n sequence_items: np.ndarray\n event_features: np.ndarray\n activity_features: np.ndarray\n state_ids: np.ndarray\n liked_states: np.ndarray\n disliked_states: np.ndarray\n state_counts: np.ndarray\n inference_user_rows: np.ndarray\n inference_liked_items: np.ndarray\n inference_disliked_items: np.ndarray\n inference_user_features: np.ndarray\n\n @property\n def lengths(self) -> np.ndarray:\n return np.diff(self.offsets)\n\n @property\n def target_count(self) -> int:\n return int(np.maximum(self.lengths - 1, 0).sum())\n\n\n@dataclass(frozen=True)\nclass TargetPartition:\n \"\"\"A contiguous recent target window and its chronological BCE split.\"\"\"\n\n window_starts: np.ndarray\n training_counts: np.ndarray\n validation_counts: np.ndarray\n history_training_counts: np.ndarray\n\n @property\n def selected_count(self) -> int:\n return int(self.training_counts.sum() + self.validation_counts.sum())\n\n\ndef log(message: str) -> None:\n print(message, file=sys.stderr, flush=True)\n\n\ndef seed_everything(seed: int) -> None:\n random.seed(seed)\n np.random.seed(seed)\n torch.manual_seed(seed)\n\n\ndef model_config(config: Config) -> base.TowerConfig:\n \"\"\"Map the dense trainer configuration onto the unchanged tower.\"\"\"\n return base.TowerConfig(\n sequence_length=config.bptt_steps,\n embedding_dim=config.embedding_dim,\n hidden_dim=config.hidden_dim,\n user_hidden_1=config.user_hidden_1,\n user_hidden_2=config.user_hidden_2,\n item_hidden_1=config.item_hidden_1,\n item_hidden_2=config.item_hidden_2,\n dropout=config.dropout,\n epochs=config.epochs,\n learning_rate=config.learning_rate,\n weight_decay=config.weight_decay,\n gradient_clip=config.gradient_clip,\n uniform_negatives=config.uniform_negatives,\n inbatch_negatives=config.inbatch_negatives,\n inbatch_correction_power=config.inbatch_correction_power,\n inbatch_correction_min=config.inbatch_correction_min,\n inbatch_correction_max=config.inbatch_correction_max,\n seed=config.seed,\n )\n\n\ndef append_state_snapshot(\n active_likes: dict[int, int],\n active_dislikes: dict[int, int],\n n_items: int,\n liked_states: list[np.ndarray],\n disliked_states: list[np.ndarray],\n state_counts: list[tuple[int, int]],\n) -> int:\n liked_states.append(base.pack_active_items(active_likes, base.LIKE_ITEMS, n_items))\n disliked_states.append(\n base.pack_active_items(active_dislikes, base.DISLIKE_ITEMS, n_items)\n )\n state_counts.append((len(active_likes), len(active_dislikes)))\n return len(liked_states) - 1\n\n\ndef causal_activity_features(\n timestamps: np.ndarray,\n items: np.ndarray,\n organic: np.ndarray,\n completion: np.ndarray,\n) -> np.ndarray:\n \"\"\"Compute the first four reviewed user features at every event cutoff.\"\"\"\n length = len(items)\n result = np.zeros((length, 4), dtype=np.float16)\n if not length:\n return result\n left_rows = np.searchsorted(\n timestamps,\n timestamps - base.PROFILE_LOOKBACK_DAYS * base.DAY,\n side=\"left\",\n )\n rows = np.arange(length, dtype=np.int64)\n counts = rows - left_rows + 1\n organic_sum = np.cumsum(organic.astype(np.float64))\n completion_sum = np.cumsum(np.minimum(completion, 100).astype(np.float64))\n before_organic = np.where(\n left_rows > 0, organic_sum[np.maximum(left_rows - 1, 0)], 0.0\n )\n before_completion = np.where(\n left_rows > 0, completion_sum[np.maximum(left_rows - 1, 0)], 0.0\n )\n\n unique_counts = np.empty(length, dtype=np.int32)\n frequencies: dict[int, int] = {}\n left = 0\n for right, raw_item in enumerate(items):\n item = int(raw_item)\n frequencies[item] = frequencies.get(item, 0) + 1\n required_left = int(left_rows[right])\n while left < required_left:\n old_item = int(items[left])\n remaining = frequencies[old_item] - 1\n if remaining:\n frequencies[old_item] = remaining\n else:\n del frequencies[old_item]\n left += 1\n unique_counts[right] = len(frequencies)\n\n result[:, 0] = (np.log1p(counts) / 8.0).astype(np.float16)\n result[:, 1] = (np.log1p(unique_counts) / 6.0).astype(np.float16)\n result[:, 2] = (\n (organic_sum - before_organic) / np.maximum(counts, 1)\n ).astype(np.float16)\n result[:, 3] = (\n (completion_sum - before_completion)\n / np.maximum(counts, 1)\n / 100.0\n ).astype(np.float16)\n return result\n\n\ndef build_sequence_parts(\n listens: base.ListenEvents,\n explicit: base.ExplicitEvents,\n n_items: int,\n liked_states: list[np.ndarray],\n disliked_states: list[np.ndarray],\n state_counts: list[tuple[int, int]],\n) -> tuple[np.ndarray, np.ndarray, np.ndarray, np.ndarray, np.ndarray] | None:\n qualifying = listens.completion_pct >= base.LISTEN_POSITIVE_THRESHOLD\n timestamps = listens.timestamps[qualifying].astype(np.int64, copy=False)\n items = listens.items[qualifying].astype(np.uint16, copy=False)\n organic = listens.organic[qualifying].astype(np.float32, copy=False)\n completion = listens.completion_pct[qualifying].astype(np.float32, copy=False)\n if not len(items):\n\"\"\"Shared public-data primitives for the Yambda two-tower baseline.\"\"\"\nfrom __future__ import annotations\n\nimport sys\nfrom dataclasses import dataclass\nfrom pathlib import Path\nfrom typing import Iterator\n\nimport numpy as np\nimport pandas as pd\nimport pyarrow.parquet as pq\nimport torch\nfrom torch import nn\n\n\nDAY = 86_400\nTRAIN_END = 24_786_800\nVALIDATION_END = 25_393_400\nLISTEN_POSITIVE_THRESHOLD = 50\nPROFILE_LOOKBACK_DAYS = 120\nLIKE_ITEMS = 48\nDISLIKE_ITEMS = 24\nTOP_N = 100\n\n\n@dataclass(frozen=True)\nclass TowerConfig:\n sequence_length: int = 100\n embedding_dim: int = 192\n hidden_dim: int = 192\n user_hidden_1: int = 512\n user_hidden_2: int = 256\n item_hidden_1: int = 512\n item_hidden_2: int = 256\n dropout: float = 0.05\n epochs: int = 1\n learning_rate: float = 1.0e-3\n weight_decay: float = 1.0e-5\n gradient_clip: float = 2.0\n uniform_negatives: int = 24\n inbatch_negatives: int = 8\n inbatch_correction_power: float = 0.5\n inbatch_correction_min: float = 0.25\n inbatch_correction_max: float = 4.0\n seed: int = 29\n\n\n@dataclass(frozen=True)\nclass ListenEvents:\n timestamps: np.ndarray\n items: np.ndarray\n organic: np.ndarray\n completion_pct: np.ndarray\n\n\n@dataclass(frozen=True)\nclass ExplicitEvents:\n timestamps: np.ndarray\n items: np.ndarray\n channel: np.ndarray\n active: np.ndarray\n organic_like: np.ndarray\n\n\ndef log(message: str) -> None:\n print(message, file=sys.stderr, flush=True)\n\n\ndef build_item_features(catalog: pd.DataFrame) -> np.ndarray:\n \"\"\"Return four standardized features built only from the public catalog.\"\"\"\n positives = catalog.positive_listens.to_numpy(dtype=np.float64, copy=False)\n organic = catalog.organic_positive_listens.to_numpy(dtype=np.float64, copy=False)\n popularity_rank = catalog.popularity_rank.to_numpy(dtype=np.float64, copy=False)\n features = np.column_stack(\n [\n np.log1p(positives),\n np.log1p(organic),\n organic / np.maximum(positives, 1.0),\n 1.0 - (popularity_rank - 1.0) / max(len(catalog) - 1, 1),\n ]\n )\n means = features.mean(axis=0, keepdims=True)\n scales = np.maximum(features.std(axis=0, keepdims=True), 1.0e-6)\n standardized = ((features - means) / scales).astype(np.float32)\n if not np.isfinite(standardized).all():\n raise RuntimeError(\"catalog features contain non-finite values\")\n return standardized\n\n\ndef _combine_listen_chunks(parts: list[ListenEvents]) -> ListenEvents:\n if len(parts) == 1:\n return parts[0]\n timestamps = np.concatenate([part.timestamps for part in parts])\n items = np.concatenate([part.items for part in parts])\n organic = np.concatenate([part.organic for part in parts])\n completion = np.concatenate([part.completion_pct for part in parts])\n order = np.argsort(timestamps, kind=\"stable\")\n return ListenEvents(\n timestamps=timestamps[order],\n items=items[order],\n organic=organic[order],\n completion_pct=completion[order],\n )\n\n\ndef iter_listen_users(\n path: Path, item_index: pd.Index\n) -> Iterator[tuple[int, ListenEvents]]:\n \"\"\"Stream one uid-sorted public listen file one user at a time.\"\"\"\n parquet = pq.ParquetFile(path)\n pending_uid: int | None = None\n pending: list[ListenEvents] = []\n previous_uid = -1\n for batch in parquet.iter_batches(\n batch_size=750_000,\n columns=[\"uid\", \"timestamp\", \"item_id\", \"is_organic\", \"played_ratio_pct\"],\n ):\n frame = batch.to_pandas()\n mapped = item_index.get_indexer(frame.item_id.to_numpy(dtype=np.int64))\n keep = mapped >= 0\n if not np.any(keep):\n continue\n uids = frame.uid.to_numpy(dtype=np.int64, copy=False)[keep]\n timestamps = frame.timestamp.to_numpy(dtype=np.int64, copy=False)[keep]\n items = mapped[keep].astype(np.int32, copy=False)\n organic = frame.is_organic.to_numpy(dtype=np.uint8, copy=False)[keep]\n completion = frame.played_ratio_pct.to_numpy(dtype=np.uint16, copy=False)[keep]\n if np.any(uids[1:] < uids[:-1]):\n raise RuntimeError(f\"{path.name} is not sorted by uid\")\n boundaries = np.r_[\n 0,\n np.flatnonzero(uids[1:] != uids[:-1]) + 1,\n len(uids),\n ]\n for start, end in zip(boundaries[:-1], boundaries[1:]):\n uid = int(uids[start])\n part = ListenEvents(\n timestamps[start:end].copy(),\n items[start:end].copy(),\n organic[start:end].copy(),\n completion[start:end].copy(),\n )\n if pending_uid is None:\n pending_uid = uid\n elif uid != pending_uid:\n if pending_uid < previous_uid:\n raise RuntimeError(f\"{path.name} user order regressed\")\n yield pending_uid, _combine_listen_chunks(pending)\n previous_uid = pending_uid\n pending_uid = uid\n pending = []\n pending.append(part)\n if pending_uid is not None:\n yield pending_uid, _combine_listen_chunks(pending)\n\n\ndef merge_listen_streams(\n paths: list[Path], item_index: pd.Index\n) -> Iterator[tuple[int, ListenEvents]]:\n \"\"\"Merge uid-sorted public listen files without materializing them.\"\"\"\n streams = [iter(iter_listen_users(path, item_index)) for path in paths]\n heads: list[tuple[int, ListenEvents] | None] = [\n next(stream, None) for stream in streams\n ]\n while any(head is not None for head in heads):\n uid = min(head[0] for head in heads if head is not None)\n parts: list[ListenEvents] = []\n for position, head in enumerate(heads):\n if head is not None and head[0] == uid:\n parts.append(head[1])\n heads[position] = next(streams[position], None)\n yield uid, _combine_listen_chunks(parts)\n\n\ndef load_explicit_events(\n data: Path,\n prefixes: tuple[str, ...],\n item_index: pd.Index,\n) -> dict[int, ExplicitEvents]:\n \"\"\"Load public explicit actions as chronological state changes.\"\"\"\n specifications = (\n (\"likes\", 0, 1, 0),\n (\"unlikes\", 0, 0, 1),\n (\"dislikes\", 1, 1, 0),\n (\"undislikes\", 1, 0, 1),\n )\n parts: list[pd.DataFrame] = []\n for family, channel, active, tie_priority in specifications:\n for prefix in prefixes:\n frame = pd.read_parquet(\n data / f\"{prefix}_{family}.parquet\",\n columns=[\"uid\", \"timestamp\", \"item_id\", \"is_organic\"],\n )\n mapped = item_index.get_indexer(\n frame.item_id.to_numpy(dtype=np.int64, copy=False)\n )\n keep = mapped >= 0\n if not np.any(keep):\n continue\n retained = frame.loc[keep, [\"uid\", \"timestamp\", \"is_organic\"]].copy()\n retained[\"item\"] = mapped[keep].astype(np.int32, copy=False)\n retained[\"channel\"] = np.int8(channel)\n retained[\"active\"] = np.int8(active)\n retained[\"tie_priority\"] = np.int8(tie_priority)\n retained[\"organic_like\"] = np.int8(\n family == \"likes\"\n ) * retained.is_organic.astype(np.int8)\n parts.append(retained.drop(columns=\"is_organic\"))\n if not parts:\n return {}\n events = pd.concat(parts, ignore_index=True)\n events = events.sort_values(\n [\"uid\", \"timestamp\", \"tie_priority\"], kind=\"mergesort\"\n ).reset_index(drop=True)\n result: dict[int, ExplicitEvents] = {}\n for uid, rows in events.groupby(\"uid\", sort=False):\n result[int(uid)] = ExplicitEvents(\n timestamps=rows.timestamp.to_numpy(dtype=np.int64, copy=True),\n items=rows.item.to_numpy(dtype=np.int32, copy=True),\n channel=rows.channel.to_numpy(dtype=np.int8, copy=True),\n active=rows.active.to_numpy(dtype=np.int8, copy=True),\n organic_like=rows.organic_like.to_numpy(dtype=np.int8, copy=True),\n )\n log(f\"loaded explicit events: rows={len(events):,} users={len(result):,}\")\n return result\n\n\ndef empty_explicit_events() -> ExplicitEvents:\n return ExplicitEvents(\n timestamps=np.empty(0, dtype=np.int64),\n items=np.empty(0, dtype=np.int32),\n channel=np.empty(0, dtype=np.int8),\n active=np.empty(0, dtype=np.int8),\n organic_like=np.empty(0, dtype=np.int8),\n )\n\n\ndef pack_active_items(\n active: dict[int, int], width: int, padding_item: int\n) -> np.ndarray:\n packed = np.full(width, padding_item, dtype=np.uint16)\n if not active:\n return packed\n ordered = sorted(active.items(), key=lambda pair: (-pair[1], pair[0]))[:width]\n packed[: len(ordered)] = np.fromiter(\n (item for item, _ in ordered), dtype=np.uint16, count=len(ordered)\n )\n return packed\n\n\ndef load_inference_state(\n path: Path,\n item_index: pd.Index,\n uids: np.ndarray,\n n_items: int,\n) -> tuple[np.ndarray, np.ndarray, np.ndarray, np.ndarray]:\n \"\"\"Pack the task-provided active explicit state.\"\"\"\n state = pd.read_parquet(path, columns=[\"uid\", \"item_id\", \"state\"])\n mapped = item_index.get_indexer(state.item_id.to_numpy(dtype=np.int64))\n keep = mapped >= 0\n#!/usr/bin/env python3\n\"\"\"Score a validation-stage ranking against public discovery labels.\n\n``build_task.py`` publishes this module with the solver-visible task files. It\nloads target users, validation eligibility, and validation-window events from\nthe adjacent ``data`` directory, then evaluates one ranking supplied on the\ncommand line. Stage-independent mechanics come from the adjacent public\n``ranking_evaluation.py`` module. The builder installs the same checked-in\nmodule in the private judge, so public and private scoring mechanics cannot\ndrift. A relevant candidate receives grade 3 for an organic like or grade 1 for\nan organic listen with at least 80 percent completion; a like takes precedence\nwhen both events exist.\n\nBefore scoring, the ranking must contain exactly 100 distinct eligible items\nfor every target user, with integer-valued ``uid``, ``item_id``, and ``rank``\ncolumns and ranks 1 through 100 exactly once per user. Extra columns are\nignored. Quality is graded NDCG@10, averaged only over users who have at least\none eligible relevant item in the validation window.\n\nThe evaluator prints a JSON object containing the model path and scores. It\ndoes not apply the task's pass threshold; its purpose is model development and\nselection. The private judge applies the threshold to the final submission.\n\nUsage::\n\n python evaluate_public.py \n\"\"\"\nfrom __future__ import annotations\n\nimport json\nimport sys\nfrom pathlib import Path\n\nimport pandas as pd\n\nfrom ranking_evaluation import (\n CandidateSet,\n RankingValidationError,\n ranked_items,\n read_ranking,\n score_rankings,\n validate_ranking,\n)\n\n\nHERE = Path(__file__).resolve().parent\nDATA = HERE / \"data\"\nLISTEN_STRONG = 80\n\n\ndef validation_truth(\n eligibility: CandidateSet, targets: set[int]\n) -> dict[int, dict[int, int]]:\n \"\"\"Build cutoff-correct graded relevance from public validation events.\n\n Only target-user events for eligible candidates are retained. Organic\n listens completed to at least 80 percent receive grade 1, and organic likes\n receive grade 3. Repeated user-item events are collapsed, and processing\n likes second ensures that grade 3 wins over grade 1.\n\n Args:\n eligibility: Validation-cutoff candidate membership service.\n targets: Complete set of target user IDs.\n\n Returns:\n A nested ``uid -> item_id -> grade`` mapping. Users without an eligible\n relevant event are omitted.\n \"\"\"\n listens = pd.read_parquet(DATA / \"val_listens.parquet\")\n likes = pd.read_parquet(DATA / \"val_likes.parquet\")\n strong = listens[\n listens.uid.isin(targets)\n & (listens.is_organic == 1)\n & (listens.played_ratio_pct >= LISTEN_STRONG)\n ][[\"uid\", \"item_id\"]].drop_duplicates()\n organic_likes = likes[\n likes.uid.isin(targets) & (likes.is_organic == 1)\n ][[\"uid\", \"item_id\"]].drop_duplicates()\n\n graded: dict[int, dict[int, int]] = {}\n for raw_uid, raw_item in strong.itertuples(index=False, name=None):\n uid, item = int(raw_uid), int(raw_item)\n if eligibility.is_eligible(uid, item):\n graded.setdefault(uid, {})[item] = 1\n for raw_uid, raw_item in organic_likes.itertuples(index=False, name=None):\n uid, item = int(raw_uid), int(raw_item)\n if eligibility.is_eligible(uid, item):\n graded.setdefault(uid, {})[item] = 3\n return graded\n\n\ndef load_submission(\n path: Path, eligibility: CandidateSet, targets: set[int]\n) -> dict[int, list[int]]:\n \"\"\"Load and validate a public validation ranking.\n\n Files ending in ``.parquet`` are read as parquet; every other suffix is\n read as CSV. The required columns must be integer-valued, cover exactly the\n target-user set, contain 100 rows and ranks 1 through 100 per user, avoid\n duplicate user-item pairs, and contain only cutoff-eligible items.\n\n Args:\n path: Ranking file to read.\n eligibility: Validation-cutoff candidate membership service.\n targets: Exact set of users the ranking must cover.\n\n Returns:\n A ``uid -> ranked item IDs`` mapping ordered by ascending rank.\n\n Raises:\n ValueError: If the ranking violates the required schema or invariants.\n \"\"\"\n frame = validate_ranking(read_ranking(path), targets)\n if not all(\n eligibility.is_eligible(uid, item)\n for uid, item in frame[[\"uid\", \"item_id\"]].itertuples(index=False, name=None)\n ):\n raise RankingValidationError(\n \"submission contains an item rejected by eligibility service\"\n )\n return ranked_items(frame)\n\n\ndef score(\n ranked: dict[int, list[int]],\n graded: dict[int, dict[int, int]],\n) -> dict[str, float | int]:\n \"\"\"Aggregate per-user NDCG@10 over users with public relevance labels.\n\n Args:\n ranked: Ranked item IDs for every target user.\n graded: Eligible validation relevance keyed by user and item.\n\n Returns:\n The six-decimal ``quality_ndcg@10`` value and number of scored users.\n \"\"\"\n return score_rankings(ranked, graded)\n\n\ndef main() -> None:\n \"\"\"Run the public evaluator CLI and print its JSON score report.\"\"\"\n targets_frame = pd.read_parquet(DATA / \"target_users.parquet\")\n targets = set(targets_frame.uid.astype(int))\n eligibility = CandidateSet(DATA / \"validation_eligible_candidates.npz\")\n graded = validation_truth(eligibility, targets)\n\n if len(sys.argv) != 2:\n raise SystemExit(\n \"usage: evaluate_public.py \"\n )\n path = Path(sys.argv[1])\n ranked = load_submission(path, eligibility, targets)\n print(json.dumps({\"model\": str(path), \"scores\": score(ranked, graded)}, indent=2))\n\n\nif __name__ == \"__main__\":\n main()\ncandidate_catalog.parquet 349352\ntarget_users.parquet 84127\ntest_eligible_candidates.npz 7736341\ntest_preference_state.parquet 1092329\ntrain_dislikes.parquet 857213\ntrain_likes.parquet 5374652\ntrain_listens.parquet 319183255\ntrain_undislikes.parquet 155988\ntrain_unlikes.parquet 1855885\nval_dislikes.parquet 36571\nval_likes.parquet 298484\nval_listens.parquet 9947609\nval_undislikes.parquet 7845\nval_unlikes.parquet 72536\nvalidation_eligible_candidates.npz 7573821\nvalidation_preference_state.parquet 1061761\n", "stderr": "", "aggregated_output": "#!/usr/bin/env python3\n\"\"\"Train the Yambda windowed two-tower baseline.\n\nEvery catalog listen with at least 50 percent completion is a sequence token.\nWithin each selected chronological window, every adjacent target contributes a\nloss. The fast default retains each user's most recent 128 training targets and\n16 held-out validation targets; passing zero for either cap restores the\nuncapped behavior for that side of the split. A 100-step truncated-BPTT block\ncomputes all of its timestep losses and carries the detached GRU hidden state\ninto the next block.\n\nThe model is a pure two-tower retriever: no user-ID embedding, no output\nnormalization, raw dot-product retrieval, sample-weighted binary cross entropy,\nand 24 uniform plus eight propensity-corrected unique in-batch negatives. Every\nselected adjacent target retains a nonzero weight. Only files under the supplied\npublic directory are read.\n\"\"\"\nfrom __future__ import annotations\n\nimport argparse\nimport json\nimport random\nimport sys\nimport time\nfrom dataclasses import asdict, dataclass\nfrom pathlib import Path\n\nimport numpy as np\nimport pandas as pd\nimport torch\nfrom torch import nn\nfrom torch.nn import functional as F\n\nimport two_tower_model as base\n\n\nCACHE_VERSION = 2\n\n\n@dataclass(frozen=True)\nclass Config:\n bptt_steps: int = 100\n user_batch_size: int = 64\n embedding_dim: int = 192\n hidden_dim: int = 192\n user_hidden_1: int = 512\n user_hidden_2: int = 256\n item_hidden_1: int = 512\n item_hidden_2: int = 256\n dropout: float = 0.05\n epochs: int = 1\n learning_rate: float = 1.0e-3\n weight_decay: float = 1.0e-5\n gradient_clip: float = 2.0\n loss_microbatch_size: int = 65_536\n uniform_negatives: int = 24\n inbatch_negatives: int = 8\n inbatch_correction_power: float = 0.5\n inbatch_correction_min: float = 0.25\n inbatch_correction_max: float = 4.0\n negative_filter_scope: str = \"full-training-history\"\n target_weighting: str = \"organic-strong\"\n ordinary_target_weight: float = 0.25\n organic_strong_target_weight: float = 1.0\n organic_like_target_weight: float = 3.0\n discovery_horizon_days: int = 7\n validation_fraction: float = 0.10\n max_train_targets_per_user: int = 128\n max_validation_targets_per_user: int = 16\n early_stopping_patience: int = 1\n early_stopping_min_delta: float = 1.0e-4\n seed: int = 29\n\n\n@dataclass(frozen=True)\nclass CandidateSet:\n uids: np.ndarray\n item_ids: np.ndarray\n packed: np.ndarray\n\n @classmethod\n def read(cls, path: Path) -> \"CandidateSet\":\n with np.load(path, allow_pickle=False) as artifact:\n result = cls(\n uids=artifact[\"uids\"].astype(np.int64, copy=True),\n item_ids=artifact[\"item_ids\"].astype(np.int64, copy=True),\n packed=artifact[\"packed_eligible\"].astype(np.uint8, copy=True),\n )\n expected = (len(result.uids), (len(result.item_ids) + 7) // 8)\n if result.packed.shape != expected:\n raise ValueError(\n f\"invalid candidate artifact shape {result.packed.shape}; \"\n f\"expected {expected}\"\n )\n return result\n\n\n@dataclass(frozen=True)\nclass SequenceData:\n item_ids: np.ndarray\n item_features: np.ndarray\n user_ids: np.ndarray\n offsets: np.ndarray\n sequence_timestamps: np.ndarray\n sequence_items: np.ndarray\n event_features: np.ndarray\n activity_features: np.ndarray\n state_ids: np.ndarray\n liked_states: np.ndarray\n disliked_states: np.ndarray\n state_counts: np.ndarray\n inference_user_rows: np.ndarray\n inference_liked_items: np.ndarray\n inference_disliked_items: np.ndarray\n inference_user_features: np.ndarray\n\n @property\n def lengths(self) -> np.ndarray:\n return np.diff(self.offsets)\n\n @property\n def target_count(self) -> int:\n return int(np.maximum(self.lengths - 1, 0).sum())\n\n\n@dataclass(frozen=True)\nclass TargetPartition:\n \"\"\"A contiguous recent target window and its chronological BCE split.\"\"\"\n\n window_starts: np.ndarray\n training_counts: np.ndarray\n validation_counts: np.ndarray\n history_training_counts: np.ndarray\n\n @property\n def selected_count(self) -> int:\n return int(self.training_counts.sum() + self.validation_counts.sum())\n\n\ndef log(message: str) -> None:\n print(message, file=sys.stderr, flush=True)\n\n\ndef seed_everything(seed: int) -> None:\n random.seed(seed)\n np.random.seed(seed)\n torch.manual_seed(seed)\n\n\ndef model_config(config: Config) -> base.TowerConfig:\n \"\"\"Map the dense trainer configuration onto the unchanged tower.\"\"\"\n return base.TowerConfig(\n sequence_length=config.bptt_steps,\n embedding_dim=config.embedding_dim,\n hidden_dim=config.hidden_dim,\n user_hidden_1=config.user_hidden_1,\n user_hidden_2=config.user_hidden_2,\n item_hidden_1=config.item_hidden_1,\n item_hidden_2=config.item_hidden_2,\n dropout=config.dropout,\n epochs=config.epochs,\n learning_rate=config.learning_rate,\n weight_decay=config.weight_decay,\n gradient_clip=config.gradient_clip,\n uniform_negatives=config.uniform_negatives,\n inbatch_negatives=config.inbatch_negatives,\n inbatch_correction_power=config.inbatch_correction_power,\n inbatch_correction_min=config.inbatch_correction_min,\n inbatch_correction_max=config.inbatch_correction_max,\n seed=config.seed,\n )\n\n\ndef append_state_snapshot(\n active_likes: dict[int, int],\n active_dislikes: dict[int, int],\n n_items: int,\n liked_states: list[np.ndarray],\n disliked_states: list[np.ndarray],\n state_counts: list[tuple[int, int]],\n) -> int:\n liked_states.append(base.pack_active_items(active_likes, base.LIKE_ITEMS, n_items))\n disliked_states.append(\n base.pack_active_items(active_dislikes, base.DISLIKE_ITEMS, n_items)\n )\n state_counts.append((len(active_likes), len(active_dislikes)))\n return len(liked_states) - 1\n\n\ndef causal_activity_features(\n timestamps: np.ndarray,\n items: np.ndarray,\n organic: np.ndarray,\n completion: np.ndarray,\n) -> np.ndarray:\n \"\"\"Compute the first four reviewed user features at every event cutoff.\"\"\"\n length = len(items)\n result = np.zeros((length, 4), dtype=np.float16)\n if not length:\n return result\n left_rows = np.searchsorted(\n timestamps,\n timestamps - base.PROFILE_LOOKBACK_DAYS * base.DAY,\n side=\"left\",\n )\n rows = np.arange(length, dtype=np.int64)\n counts = rows - left_rows + 1\n organic_sum = np.cumsum(organic.astype(np.float64))\n completion_sum = np.cumsum(np.minimum(completion, 100).astype(np.float64))\n before_organic = np.where(\n left_rows > 0, organic_sum[np.maximum(left_rows - 1, 0)], 0.0\n )\n before_completion = np.where(\n left_rows > 0, completion_sum[np.maximum(left_rows - 1, 0)], 0.0\n )\n\n unique_counts = np.empty(length, dtype=np.int32)\n frequencies: dict[int, int] = {}\n left = 0\n for right, raw_item in enumerate(items):\n item = int(raw_item)\n frequencies[item] = frequencies.get(item, 0) + 1\n required_left = int(left_rows[right])\n while left < required_left:\n old_item = int(items[left])\n remaining = frequencies[old_item] - 1\n if remaining:\n frequencies[old_item] = remaining\n else:\n del frequencies[old_item]\n left += 1\n unique_counts[right] = len(frequencies)\n\n result[:, 0] = (np.log1p(counts) / 8.0).astype(np.float16)\n result[:, 1] = (np.log1p(unique_counts) / 6.0).astype(np.float16)\n result[:, 2] = (\n (organic_sum - before_organic) / np.maximum(counts, 1)\n ).astype(np.float16)\n result[:, 3] = (\n (completion_sum - before_completion)\n / np.maximum(counts, 1)\n / 100.0\n ).astype(np.float16)\n return result\n\n\ndef build_sequence_parts(\n listens: base.ListenEvents,\n explicit: base.ExplicitEvents,\n n_items: int,\n liked_states: list[np.ndarray],\n disliked_states: list[np.ndarray],\n state_counts: list[tuple[int, int]],\n) -> tuple[np.ndarray, np.ndarray, np.ndarray, np.ndarray, np.ndarray] | None:\n qualifying = listens.completion_pct >= base.LISTEN_POSITIVE_THRESHOLD\n timestamps = listens.timestamps[qualifying].astype(np.int64, copy=False)\n items = listens.items[qualifying].astype(np.uint16, copy=False)\n organic = listens.organic[qualifying].astype(np.float32, copy=False)\n completion = listens.completion_pct[qualifying].astype(np.float32, copy=False)\n if not len(items):\n\"\"\"Shared public-data primitives for the Yambda two-tower baseline.\"\"\"\nfrom __future__ import annotations\n\nimport sys\nfrom dataclasses import dataclass\nfrom pathlib import Path\nfrom typing import Iterator\n\nimport numpy as np\nimport pandas as pd\nimport pyarrow.parquet as pq\nimport torch\nfrom torch import nn\n\n\nDAY = 86_400\nTRAIN_END = 24_786_800\nVALIDATION_END = 25_393_400\nLISTEN_POSITIVE_THRESHOLD = 50\nPROFILE_LOOKBACK_DAYS = 120\nLIKE_ITEMS = 48\nDISLIKE_ITEMS = 24\nTOP_N = 100\n\n\n@dataclass(frozen=True)\nclass TowerConfig:\n sequence_length: int = 100\n embedding_dim: int = 192\n hidden_dim: int = 192\n user_hidden_1: int = 512\n user_hidden_2: int = 256\n item_hidden_1: int = 512\n item_hidden_2: int = 256\n dropout: float = 0.05\n epochs: int = 1\n learning_rate: float = 1.0e-3\n weight_decay: float = 1.0e-5\n gradient_clip: float = 2.0\n uniform_negatives: int = 24\n inbatch_negatives: int = 8\n inbatch_correction_power: float = 0.5\n inbatch_correction_min: float = 0.25\n inbatch_correction_max: float = 4.0\n seed: int = 29\n\n\n@dataclass(frozen=True)\nclass ListenEvents:\n timestamps: np.ndarray\n items: np.ndarray\n organic: np.ndarray\n completion_pct: np.ndarray\n\n\n@dataclass(frozen=True)\nclass ExplicitEvents:\n timestamps: np.ndarray\n items: np.ndarray\n channel: np.ndarray\n active: np.ndarray\n organic_like: np.ndarray\n\n\ndef log(message: str) -> None:\n print(message, file=sys.stderr, flush=True)\n\n\ndef build_item_features(catalog: pd.DataFrame) -> np.ndarray:\n \"\"\"Return four standardized features built only from the public catalog.\"\"\"\n positives = catalog.positive_listens.to_numpy(dtype=np.float64, copy=False)\n organic = catalog.organic_positive_listens.to_numpy(dtype=np.float64, copy=False)\n popularity_rank = catalog.popularity_rank.to_numpy(dtype=np.float64, copy=False)\n features = np.column_stack(\n [\n np.log1p(positives),\n np.log1p(organic),\n organic / np.maximum(positives, 1.0),\n 1.0 - (popularity_rank - 1.0) / max(len(catalog) - 1, 1),\n ]\n )\n means = features.mean(axis=0, keepdims=True)\n scales = np.maximum(features.std(axis=0, keepdims=True), 1.0e-6)\n standardized = ((features - means) / scales).astype(np.float32)\n if not np.isfinite(standardized).all():\n raise RuntimeError(\"catalog features contain non-finite values\")\n return standardized\n\n\ndef _combine_listen_chunks(parts: list[ListenEvents]) -> ListenEvents:\n if len(parts) == 1:\n return parts[0]\n timestamps = np.concatenate([part.timestamps for part in parts])\n items = np.concatenate([part.items for part in parts])\n organic = np.concatenate([part.organic for part in parts])\n completion = np.concatenate([part.completion_pct for part in parts])\n order = np.argsort(timestamps, kind=\"stable\")\n return ListenEvents(\n timestamps=timestamps[order],\n items=items[order],\n organic=organic[order],\n completion_pct=completion[order],\n )\n\n\ndef iter_listen_users(\n path: Path, item_index: pd.Index\n) -> Iterator[tuple[int, ListenEvents]]:\n \"\"\"Stream one uid-sorted public listen file one user at a time.\"\"\"\n parquet = pq.ParquetFile(path)\n pending_uid: int | None = None\n pending: list[ListenEvents] = []\n previous_uid = -1\n for batch in parquet.iter_batches(\n batch_size=750_000,\n columns=[\"uid\", \"timestamp\", \"item_id\", \"is_organic\", \"played_ratio_pct\"],\n ):\n frame = batch.to_pandas()\n mapped = item_index.get_indexer(frame.item_id.to_numpy(dtype=np.int64))\n keep = mapped >= 0\n if not np.any(keep):\n continue\n uids = frame.uid.to_numpy(dtype=np.int64, copy=False)[keep]\n timestamps = frame.timestamp.to_numpy(dtype=np.int64, copy=False)[keep]\n items = mapped[keep].astype(np.int32, copy=False)\n organic = frame.is_organic.to_numpy(dtype=np.uint8, copy=False)[keep]\n completion = frame.played_ratio_pct.to_numpy(dtype=np.uint16, copy=False)[keep]\n if np.any(uids[1:] < uids[:-1]):\n raise RuntimeError(f\"{path.name} is not sorted by uid\")\n boundaries = np.r_[\n 0,\n np.flatnonzero(uids[1:] != uids[:-1]) + 1,\n len(uids),\n ]\n for start, end in zip(boundaries[:-1], boundaries[1:]):\n uid = int(uids[start])\n part = ListenEvents(\n timestamps[start:end].copy(),\n items[start:end].copy(),\n organic[start:end].copy(),\n completion[start:end].copy(),\n )\n if pending_uid is None:\n pending_uid = uid\n elif uid != pending_uid:\n if pending_uid < previous_uid:\n raise RuntimeError(f\"{path.name} user order regressed\")\n yield pending_uid, _combine_listen_chunks(pending)\n previous_uid = pending_uid\n pending_uid = uid\n pending = []\n pending.append(part)\n if pending_uid is not None:\n yield pending_uid, _combine_listen_chunks(pending)\n\n\ndef merge_listen_streams(\n paths: list[Path], item_index: pd.Index\n) -> Iterator[tuple[int, ListenEvents]]:\n \"\"\"Merge uid-sorted public listen files without materializing them.\"\"\"\n streams = [iter(iter_listen_users(path, item_index)) for path in paths]\n heads: list[tuple[int, ListenEvents] | None] = [\n next(stream, None) for stream in streams\n ]\n while any(head is not None for head in heads):\n uid = min(head[0] for head in heads if head is not None)\n parts: list[ListenEvents] = []\n for position, head in enumerate(heads):\n if head is not None and head[0] == uid:\n parts.append(head[1])\n heads[position] = next(streams[position], None)\n yield uid, _combine_listen_chunks(parts)\n\n\ndef load_explicit_events(\n data: Path,\n prefixes: tuple[str, ...],\n item_index: pd.Index,\n) -> dict[int, ExplicitEvents]:\n \"\"\"Load public explicit actions as chronological state changes.\"\"\"\n specifications = (\n (\"likes\", 0, 1, 0),\n (\"unlikes\", 0, 0, 1),\n (\"dislikes\", 1, 1, 0),\n (\"undislikes\", 1, 0, 1),\n )\n parts: list[pd.DataFrame] = []\n for family, channel, active, tie_priority in specifications:\n for prefix in prefixes:\n frame = pd.read_parquet(\n data / f\"{prefix}_{family}.parquet\",\n columns=[\"uid\", \"timestamp\", \"item_id\", \"is_organic\"],\n )\n mapped = item_index.get_indexer(\n frame.item_id.to_numpy(dtype=np.int64, copy=False)\n )\n keep = mapped >= 0\n if not np.any(keep):\n continue\n retained = frame.loc[keep, [\"uid\", \"timestamp\", \"is_organic\"]].copy()\n retained[\"item\"] = mapped[keep].astype(np.int32, copy=False)\n retained[\"channel\"] = np.int8(channel)\n retained[\"active\"] = np.int8(active)\n retained[\"tie_priority\"] = np.int8(tie_priority)\n retained[\"organic_like\"] = np.int8(\n family == \"likes\"\n ) * retained.is_organic.astype(np.int8)\n parts.append(retained.drop(columns=\"is_organic\"))\n if not parts:\n return {}\n events = pd.concat(parts, ignore_index=True)\n events = events.sort_values(\n [\"uid\", \"timestamp\", \"tie_priority\"], kind=\"mergesort\"\n ).reset_index(drop=True)\n result: dict[int, ExplicitEvents] = {}\n for uid, rows in events.groupby(\"uid\", sort=False):\n result[int(uid)] = ExplicitEvents(\n timestamps=rows.timestamp.to_numpy(dtype=np.int64, copy=True),\n items=rows.item.to_numpy(dtype=np.int32, copy=True),\n channel=rows.channel.to_numpy(dtype=np.int8, copy=True),\n active=rows.active.to_numpy(dtype=np.int8, copy=True),\n organic_like=rows.organic_like.to_numpy(dtype=np.int8, copy=True),\n )\n log(f\"loaded explicit events: rows={len(events):,} users={len(result):,}\")\n return result\n\n\ndef empty_explicit_events() -> ExplicitEvents:\n return ExplicitEvents(\n timestamps=np.empty(0, dtype=np.int64),\n items=np.empty(0, dtype=np.int32),\n channel=np.empty(0, dtype=np.int8),\n active=np.empty(0, dtype=np.int8),\n organic_like=np.empty(0, dtype=np.int8),\n )\n\n\ndef pack_active_items(\n active: dict[int, int], width: int, padding_item: int\n) -> np.ndarray:\n packed = np.full(width, padding_item, dtype=np.uint16)\n if not active:\n return packed\n ordered = sorted(active.items(), key=lambda pair: (-pair[1], pair[0]))[:width]\n packed[: len(ordered)] = np.fromiter(\n (item for item, _ in ordered), dtype=np.uint16, count=len(ordered)\n )\n return packed\n\n\ndef load_inference_state(\n path: Path,\n item_index: pd.Index,\n uids: np.ndarray,\n n_items: int,\n) -> tuple[np.ndarray, np.ndarray, np.ndarray, np.ndarray]:\n \"\"\"Pack the task-provided active explicit state.\"\"\"\n state = pd.read_parquet(path, columns=[\"uid\", \"item_id\", \"state\"])\n mapped = item_index.get_indexer(state.item_id.to_numpy(dtype=np.int64))\n keep = mapped >= 0\n#!/usr/bin/env python3\n\"\"\"Score a validation-stage ranking against public discovery labels.\n\n``build_task.py`` publishes this module with the solver-visible task files. It\nloads target users, validation eligibility, and validation-window events from\nthe adjacent ``data`` directory, then evaluates one ranking supplied on the\ncommand line. Stage-independent mechanics come from the adjacent public\n``ranking_evaluation.py`` module. The builder installs the same checked-in\nmodule in the private judge, so public and private scoring mechanics cannot\ndrift. A relevant candidate receives grade 3 for an organic like or grade 1 for\nan organic listen with at least 80 percent completion; a like takes precedence\nwhen both events exist.\n\nBefore scoring, the ranking must contain exactly 100 distinct eligible items\nfor every target user, with integer-valued ``uid``, ``item_id``, and ``rank``\ncolumns and ranks 1 through 100 exactly once per user. Extra columns are\nignored. Quality is graded NDCG@10, averaged only over users who have at least\none eligible relevant item in the validation window.\n\nThe evaluator prints a JSON object containing the model path and scores. It\ndoes not apply the task's pass threshold; its purpose is model development and\nselection. The private judge applies the threshold to the final submission.\n\nUsage::\n\n python evaluate_public.py \n\"\"\"\nfrom __future__ import annotations\n\nimport json\nimport sys\nfrom pathlib import Path\n\nimport pandas as pd\n\nfrom ranking_evaluation import (\n CandidateSet,\n RankingValidationError,\n ranked_items,\n read_ranking,\n score_rankings,\n validate_ranking,\n)\n\n\nHERE = Path(__file__).resolve().parent\nDATA = HERE / \"data\"\nLISTEN_STRONG = 80\n\n\ndef validation_truth(\n eligibility: CandidateSet, targets: set[int]\n) -> dict[int, dict[int, int]]:\n \"\"\"Build cutoff-correct graded relevance from public validation events.\n\n Only target-user events for eligible candidates are retained. Organic\n listens completed to at least 80 percent receive grade 1, and organic likes\n receive grade 3. Repeated user-item events are collapsed, and processing\n likes second ensures that grade 3 wins over grade 1.\n\n Args:\n eligibility: Validation-cutoff candidate membership service.\n targets: Complete set of target user IDs.\n\n Returns:\n A nested ``uid -> item_id -> grade`` mapping. Users without an eligible\n relevant event are omitted.\n \"\"\"\n listens = pd.read_parquet(DATA / \"val_listens.parquet\")\n likes = pd.read_parquet(DATA / \"val_likes.parquet\")\n strong = listens[\n listens.uid.isin(targets)\n & (listens.is_organic == 1)\n & (listens.played_ratio_pct >= LISTEN_STRONG)\n ][[\"uid\", \"item_id\"]].drop_duplicates()\n organic_likes = likes[\n likes.uid.isin(targets) & (likes.is_organic == 1)\n ][[\"uid\", \"item_id\"]].drop_duplicates()\n\n graded: dict[int, dict[int, int]] = {}\n for raw_uid, raw_item in strong.itertuples(index=False, name=None):\n uid, item = int(raw_uid), int(raw_item)\n if eligibility.is_eligible(uid, item):\n graded.setdefault(uid, {})[item] = 1\n for raw_uid, raw_item in organic_likes.itertuples(index=False, name=None):\n uid, item = int(raw_uid), int(raw_item)\n if eligibility.is_eligible(uid, item):\n graded.setdefault(uid, {})[item] = 3\n return graded\n\n\ndef load_submission(\n path: Path, eligibility: CandidateSet, targets: set[int]\n) -> dict[int, list[int]]:\n \"\"\"Load and validate a public validation ranking.\n\n Files ending in ``.parquet`` are read as parquet; every other suffix is\n read as CSV. The required columns must be integer-valued, cover exactly the\n target-user set, contain 100 rows and ranks 1 through 100 per user, avoid\n duplicate user-item pairs, and contain only cutoff-eligible items.\n\n Args:\n path: Ranking file to read.\n eligibility: Validation-cutoff candidate membership service.\n targets: Exact set of users the ranking must cover.\n\n Returns:\n A ``uid -> ranked item IDs`` mapping ordered by ascending rank.\n\n Raises:\n ValueError: If the ranking violates the required schema or invariants.\n \"\"\"\n frame = validate_ranking(read_ranking(path), targets)\n if not all(\n eligibility.is_eligible(uid, item)\n for uid, item in frame[[\"uid\", \"item_id\"]].itertuples(index=False, name=None)\n ):\n raise RankingValidationError(\n \"submission contains an item rejected by eligibility service\"\n )\n return ranked_items(frame)\n\n\ndef score(\n ranked: dict[int, list[int]],\n graded: dict[int, dict[int, int]],\n) -> dict[str, float | int]:\n \"\"\"Aggregate per-user NDCG@10 over users with public relevance labels.\n\n Args:\n ranked: Ranked item IDs for every target user.\n graded: Eligible validation relevance keyed by user and item.\n\n Returns:\n The six-decimal ``quality_ndcg@10`` value and number of scored users.\n \"\"\"\n return score_rankings(ranked, graded)\n\n\ndef main() -> None:\n \"\"\"Run the public evaluator CLI and print its JSON score report.\"\"\"\n targets_frame = pd.read_parquet(DATA / \"target_users.parquet\")\n targets = set(targets_frame.uid.astype(int))\n eligibility = CandidateSet(DATA / \"validation_eligible_candidates.npz\")\n graded = validation_truth(eligibility, targets)\n\n if len(sys.argv) != 2:\n raise SystemExit(\n \"usage: evaluate_public.py \"\n )\n path = Path(sys.argv[1])\n ranked = load_submission(path, eligibility, targets)\n print(json.dumps({\"model\": str(path), \"scores\": score(ranked, graded)}, indent=2))\n\n\nif __name__ == \"__main__\":\n main()\ncandidate_catalog.parquet 349352\ntarget_users.parquet 84127\ntest_eligible_candidates.npz 7736341\ntest_preference_state.parquet 1092329\ntrain_dislikes.parquet 857213\ntrain_likes.parquet 5374652\ntrain_listens.parquet 319183255\ntrain_undislikes.parquet 155988\ntrain_unlikes.parquet 1855885\nval_dislikes.parquet 36571\nval_likes.parquet 298484\nval_listens.parquet 9947609\nval_undislikes.parquet 7845\nval_unlikes.parquet 72536\nvalidation_eligible_candidates.npz 7573821\nvalidation_preference_state.parquet 1061761\n", "exit_code": 0, "duration": { "secs": 0, "nanos": 4260 }, "formatted_output": "#!/usr/bin/env python3\n\"\"\"Train the Yambda windowed two-tower baseline.\n\nEvery catalog listen with at least 50 percent completion is a sequence token.\nWithin each selected chronological window, every adjacent target contributes a\nloss. The fast default retains each user's most recent 128 training targets and\n16 held-out validation targets; passing zero for either cap restores the\nuncapped behavior for that side of the split. A 100-step truncated-BPTT block\ncomputes all of its timestep losses and carries the detached GRU hidden state\ninto the next block.\n\nThe model is a pure two-tower retriever: no user-ID embedding, no output\nnormalization, raw dot-product retrieval, sample-weighted binary cross entropy,\nand 24 uniform plus eight propensity-corrected unique in-batch negatives. Every\nselected adjacent target retains a nonzero weight. Only files under the supplied\npublic directory are read.\n\"\"\"\nfrom __future__ import annotations\n\nimport argparse\nimport json\nimport random\nimport sys\nimport time\nfrom dataclasses import asdict, dataclass\nfrom pathlib import Path\n\nimport numpy as np\nimport pandas as pd\nimport torch\nfrom torch import nn\nfrom torch.nn import functional as F\n\nimport two_tower_model as base\n\n\nCACHE_VERSION = 2\n\n\n@dataclass(frozen=True)\nclass Config:\n bptt_steps: int = 100\n user_batch_size: int = 64\n embedding_dim: int = 192\n hidden_dim: int = 192\n user_hidden_1: int = 512\n user_hidden_2: int = 256\n item_hidden_1: int = 512\n item_hidden_2: int = 256\n dropout: float = 0.05\n epochs: int = 1\n learning_rate: float = 1.0e-3\n weight_decay: float = 1.0e-5\n gradient_clip: float = 2.0\n loss_microbatch_size: int = 65_536\n uniform_negatives: int = 24\n inbatch_negatives: int = 8\n inbatch_correction_power: float = 0.5\n inbatch_correction_min: float = 0.25\n inbatch_correction_max: float = 4.0\n negative_filter_scope: str = \"full-training-history\"\n target_weighting: str = \"organic-strong\"\n ordinary_target_weight: float = 0.25\n organic_strong_target_weight: float = 1.0\n organic_like_target_weight: float = 3.0\n discovery_horizon_days: int = 7\n validation_fraction: float = 0.10\n max_train_targets_per_user: int = 128\n max_validation_targets_per_user: int = 16\n early_stopping_patience: int = 1\n early_stopping_min_delta: float = 1.0e-4\n seed: int = 29\n\n\n@dataclass(frozen=True)\nclass CandidateSet:\n uids: np.ndarray\n item_ids: np.ndarray\n packed: np.ndarray\n\n @classmethod\n def read(cls, path: Path) -> \"CandidateSet\":\n with np.load(path, allow_pickle=False) as artifact:\n result = cls(\n uids=artifact[\"uids\"].astype(np.int64, copy=True),\n item_ids=artifact[\"item_ids\"].astype(np.int64, copy=True),\n packed=artifact[\"packed_eligible\"].astype(np.uint8, copy=True),\n )\n expected = (len(result.uids), (len(result.item_ids) + 7) // 8)\n if result.packed.shape != expected:\n raise ValueError(\n f\"invalid candidate artifact shape {result.packed.shape}; \"\n f\"expected {expected}\"\n )\n return result\n\n\n@dataclass(frozen=True)\nclass SequenceData:\n item_ids: np.ndarray\n item_features: np.ndarray\n user_ids: np.ndarray\n offsets: np.ndarray\n sequence_timestamps: np.ndarray\n sequence_items: np.ndarray\n event_features: np.ndarray\n activity_features: np.ndarray\n state_ids: np.ndarray\n liked_states: np.ndarray\n disliked_states: np.ndarray\n state_counts: np.ndarray\n inference_user_rows: np.ndarray\n inference_liked_items: np.ndarray\n inference_disliked_items: np.ndarray\n inference_user_features: np.ndarray\n\n @property\n def lengths(self) -> np.ndarray:\n return np.diff(self.offsets)\n\n @property\n def target_count(self) -> int:\n return int(np.maximum(self.lengths - 1, 0).sum())\n\n\n@dataclass(frozen=True)\nclass TargetPartition:\n \"\"\"A contiguous recent target window and its chronological BCE split.\"\"\"\n\n window_starts: np.ndarray\n training_counts: np.ndarray\n validation_counts: np.ndarray\n history_training_counts: np.ndarray\n\n @property\n def selected_count(self) -> int:\n return int(self.training_counts.sum() + self.validation_counts.sum())\n\n\ndef log(message: str) -> None:\n print(message, file=sys.stderr, flush=True)\n\n\ndef seed_everything(seed: int) -> None:\n random.seed(seed)\n np.random.seed(seed)\n torch.manual_seed(seed)\n\n\ndef model_config(config: Config) -> base.TowerConfig:\n \"\"\"Map the dense trainer configuration onto the unchanged tower.\"\"\"\n return base.TowerConfig(\n sequence_length=config.bptt_steps,\n embedding_dim=config.embedding_dim,\n hidden_dim=config.hidden_dim,\n user_hidden_1=config.user_hidden_1,\n user_hidden_2=config.user_hidden_2,\n item_hidden_1=config.item_hidden_1,\n item_hidden_2=config.item_hidden_2,\n dropout=config.dropout,\n epochs=config.epochs,\n learning_rate=config.learning_rate,\n weight_decay=config.weight_decay,\n gradient_clip=config.gradient_clip,\n uniform_negatives=config.uniform_negatives,\n inbatch_negatives=config.inbatch_negatives,\n inbatch_correction_power=config.inbatch_correction_power,\n inbatch_correction_min=config.inbatch_correction_min,\n inbatch_correction_max=config.inbatch_correction_max,\n seed=config.seed,\n )\n\n\ndef append_state_snapshot(\n active_likes: dict[int, int],\n active_dislikes: dict[int, int],\n n_items: int,\n liked_states: list[np.ndarray],\n disliked_states: list[np.ndarray],\n state_counts: list[tuple[int, int]],\n) -> int:\n liked_states.append(base.pack_active_items(active_likes, base.LIKE_ITEMS, n_items))\n disliked_states.append(\n base.pack_active_items(active_dislikes, base.DISLIKE_ITEMS, n_items)\n )\n state_counts.append((len(active_likes), len(active_dislikes)))\n return len(liked_states) - 1\n\n\ndef causal_activity_features(\n timestamps: np.ndarray,\n items: np.ndarray,\n organic: np.ndarray,\n completion: np.ndarray,\n) -> np.ndarray:\n \"\"\"Compute the first four reviewed user features at every event cutoff.\"\"\"\n length = len(items)\n result = np.zeros((length, 4), dtype=np.float16)\n if not length:\n return result\n left_rows = np.searchsorted(\n timestamps,\n timestamps - base.PROFILE_LOOKBACK_DAYS * base.DAY,\n side=\"left\",\n )\n rows = np.arange(length, dtype=np.int64)\n counts = rows - left_rows + 1\n organic_sum = np.cumsum(organic.astype(np.float64))\n completion_sum = np.cumsum(np.minimum(completion, 100).astype(np.float64))\n before_organic = np.where(\n left_rows > 0, organic_sum[np.maximum(left_rows - 1, 0)], 0.0\n )\n before_completion = np.where(\n left_rows > 0, completion_sum[np.maximum(left_rows - 1, 0)], 0.0\n )\n\n unique_counts = np.empty(length, dtype=np.int32)\n frequencies: dict[int, int] = {}\n left = 0\n for right, raw_item in enumerate(items):\n item = int(raw_item)\n frequencies[item] = frequencies.get(item, 0) + 1\n required_left = int(left_rows[right])\n while left < required_left:\n old_item = int(items[left])\n remaining = frequencies[old_item] - 1\n if remaining:\n frequencies[old_item] = remaining\n else:\n del frequencies[old_item]\n left += 1\n unique_counts[right] = len(frequencies)\n\n result[:, 0] = (np.log1p(counts) / 8.0).astype(np.float16)\n result[:, 1] = (np.log1p(unique_counts) / 6.0).astype(np.float16)\n result[:, 2] = (\n (organic_sum - before_organic) / np.maximum(counts, 1)\n ).astype(np.float16)\n result[:, 3] = (\n (completion_sum - before_completion)\n / np.maximum(counts, 1)\n / 100.0\n ).astype(np.float16)\n return result\n\n\ndef build_sequence_parts(\n listens: base.ListenEvents,\n explicit: base.ExplicitEvents,\n n_items: int,\n liked_states: list[np.ndarray],\n disliked_states: list[np.ndarray],\n state_counts: list[tuple[int, int]],\n) -> tuple[np.ndarray, np.ndarray, np.ndarray, np.ndarray, np.ndarray] | None:\n qualifying = listens.completion_pct >= base.LISTEN_POSITIVE_THRESHOLD\n timestamps = listens.timestamps[qualifying].astype(np.int64, copy=False)\n items = listens.items[qualifying].astype(np.uint16, copy=False)\n organic = listens.organic[qualifying].astype(np.float32, copy=False)\n completion = listens.completion_pct[qualifying].astype(np.float32, copy=False)\n if not len(items):\n\"\"\"Shared public-data primitives for the Yambda two-tower baseline.\"\"\"\nfrom __future__ import annotations\n\nimport sys\nfrom dataclasses import dataclass\nfrom pathlib import Path\nfrom typing import Iterator\n\nimport numpy as np\nimport pandas as pd\nimport pyarrow.parquet as pq\nimport torch\nfrom torch import nn\n\n\nDAY = 86_400\nTRAIN_END = 24_786_800\nVALIDATION_END = 25_393_400\nLISTEN_POSITIVE_THRESHOLD = 50\nPROFILE_LOOKBACK_DAYS = 120\nLIKE_ITEMS = 48\nDISLIKE_ITEMS = 24\nTOP_N = 100\n\n\n@dataclass(frozen=True)\nclass TowerConfig:\n sequence_length: int = 100\n embedding_dim: int = 192\n hidden_dim: int = 192\n user_hidden_1: int = 512\n user_hidden_2: int = 256\n item_hidden_1: int = 512\n item_hidden_2: int = 256\n dropout: float = 0.05\n epochs: int = 1\n learning_rate: float = 1.0e-3\n weight_decay: float = 1.0e-5\n gradient_clip: float = 2.0\n uniform_negatives: int = 24\n inbatch_negatives: int = 8\n inbatch_correction_power: float = 0.5\n inbatch_correction_min: float = 0.25\n inbatch_correction_max: float = 4.0\n seed: int = 29\n\n\n@dataclass(frozen=True)\nclass ListenEvents:\n timestamps: np.ndarray\n items: np.ndarray\n organic: np.ndarray\n completion_pct: np.ndarray\n\n\n@dataclass(frozen=True)\nclass ExplicitEvents:\n timestamps: np.ndarray\n items: np.ndarray\n channel: np.ndarray\n active: np.ndarray\n organic_like: np.ndarray\n\n\ndef log(message: str) -> None:\n print(message, file=sys.stderr, flush=True)\n\n\ndef build_item_features(catalog: pd.DataFrame) -> np.ndarray:\n \"\"\"Return four standardized features built only from the public catalog.\"\"\"\n positives = catalog.positive_listens.to_numpy(dtype=np.float64, copy=False)\n organic = catalog.organic_positive_listens.to_numpy(dtype=np.float64, copy=False)\n popularity_rank = catalog.popularity_rank.to_numpy(dtype=np.float64, copy=False)\n features = np.column_stack(\n [\n np.log1p(positives),\n np.log1p(organic),\n organic / np.maximum(positives, 1.0),\n 1.0 - (popularity_rank - 1.0) / max(len(catalog) - 1, 1),\n ]\n )\n means = features.mean(axis=0, keepdims=True)\n scales = np.maximum(features.std(axis=0, keepdims=True), 1.0e-6)\n standardized = ((features - means) / scales).astype(np.float32)\n if not np.isfinite(standardized).all():\n raise RuntimeError(\"catalog features contain non-finite values\")\n return standardized\n\n\ndef _combine_listen_chunks(parts: list[ListenEvents]) -> ListenEvents:\n if len(parts) == 1:\n return parts[0]\n timestamps = np.concatenate([part.timestamps for part in parts])\n items = np.concatenate([part.items for part in parts])\n organic = np.concatenate([part.organic for part in parts])\n completion = np.concatenate([part.completion_pct for part in parts])\n order = np.argsort(timestamps, kind=\"stable\")\n return ListenEvents(\n timestamps=timestamps[order],\n items=items[order],\n organic=organic[order],\n completion_pct=completion[order],\n )\n\n\ndef iter_listen_users(\n path: Path, item_index: pd.Index\n) -> Iterator[tuple[int, ListenEvents]]:\n \"\"\"Stream one uid-sorted public listen file one user at a time.\"\"\"\n parquet = pq.ParquetFile(path)\n pending_uid: int | None = None\n pending: list[ListenEvents] = []\n previous_uid = -1\n for batch in parquet.iter_batches(\n batch_size=750_000,\n columns=[\"uid\", \"timestamp\", \"item_id\", \"is_organic\", \"played_ratio_pct\"],\n ):\n frame = batch.to_pandas()\n mapped = item_index.get_indexer(frame.item_id.to_numpy(dtype=np.int64))\n keep = mapped >= 0\n if not np.any(keep):\n continue\n uids = frame.uid.to_numpy(dtype=np.int64, copy=False)[keep]\n timestamps = frame.timestamp.to_numpy(dtype=np.int64, copy=False)[keep]\n items = mapped[keep].astype(np.int32, copy=False)\n organic = frame.is_organic.to_numpy(dtype=np.uint8, copy=False)[keep]\n completion = frame.played_ratio_pct.to_numpy(dtype=np.uint16, copy=False)[keep]\n if np.any(uids[1:] < uids[:-1]):\n raise RuntimeError(f\"{path.name} is not sorted by uid\")\n boundaries = np.r_[\n 0,\n np.flatnonzero(uids[1:] != uids[:-1]) + 1,\n len(uids),\n ]\n for start, end in zip(boundaries[:-1], boundaries[1:]):\n uid = int(uids[start])\n part = ListenEvents(\n timestamps[start:end].copy(),\n items[start:end].copy(),\n organic[start:end].copy(),\n completion[start:end].copy(),\n )\n if pending_uid is None:\n pending_uid = uid\n elif uid != pending_uid:\n if pending_uid < previous_uid:\n raise RuntimeError(f\"{path.name} user order regressed\")\n yield pending_uid, _combine_listen_chunks(pending)\n previous_uid = pending_uid\n pending_uid = uid\n pending = []\n pending.append(part)\n if pending_uid is not None:\n yield pending_uid, _combine_listen_chunks(pending)\n\n\ndef merge_listen_streams(\n paths: list[Path], item_index: pd.Index\n) -> Iterator[tuple[int, ListenEvents]]:\n \"\"\"Merge uid-sorted public listen files without materializing them.\"\"\"\n streams = [iter(iter_listen_users(path, item_index)) for path in paths]\n heads: list[tuple[int, ListenEvents] | None] = [\n next(stream, None) for stream in streams\n ]\n while any(head is not None for head in heads):\n uid = min(head[0] for head in heads if head is not None)\n parts: list[ListenEvents] = []\n for position, head in enumerate(heads):\n if head is not None and head[0] == uid:\n parts.append(head[1])\n heads[position] = next(streams[position], None)\n yield uid, _combine_listen_chunks(parts)\n\n\ndef load_explicit_events(\n data: Path,\n prefixes: tuple[str, ...],\n item_index: pd.Index,\n) -> dict[int, ExplicitEvents]:\n \"\"\"Load public explicit actions as chronological state changes.\"\"\"\n specifications = (\n (\"likes\", 0, 1, 0),\n (\"unlikes\", 0, 0, 1),\n (\"dislikes\", 1, 1, 0),\n (\"undislikes\", 1, 0, 1),\n )\n parts: list[pd.DataFrame] = []\n for family, channel, active, tie_priority in specifications:\n for prefix in prefixes:\n frame = pd.read_parquet(\n data / f\"{prefix}_{family}.parquet\",\n columns=[\"uid\", \"timestamp\", \"item_id\", \"is_organic\"],\n )\n mapped = item_index.get_indexer(\n frame.item_id.to_numpy(dtype=np.int64, copy=False)\n )\n keep = mapped >= 0\n if not np.any(keep):\n continue\n retained = frame.loc[keep, [\"uid\", \"timestamp\", \"is_organic\"]].copy()\n retained[\"item\"] = mapped[keep].astype(np.int32, copy=False)\n retained[\"channel\"] = np.int8(channel)\n retained[\"active\"] = np.int8(active)\n retained[\"tie_priority\"] = np.int8(tie_priority)\n retained[\"organic_like\"] = np.int8(\n family == \"likes\"\n ) * retained.is_organic.astype(np.int8)\n parts.append(retained.drop(columns=\"is_organic\"))\n if not parts:\n return {}\n events = pd.concat(parts, ignore_index=True)\n events = events.sort_values(\n [\"uid\", \"timestamp\", \"tie_priority\"], kind=\"mergesort\"\n ).reset_index(drop=True)\n result: dict[int, ExplicitEvents] = {}\n for uid, rows in events.groupby(\"uid\", sort=False):\n result[int(uid)] = ExplicitEvents(\n timestamps=rows.timestamp.to_numpy(dtype=np.int64, copy=True),\n items=rows.item.to_numpy(dtype=np.int32, copy=True),\n channel=rows.channel.to_numpy(dtype=np.int8, copy=True),\n active=rows.active.to_numpy(dtype=np.int8, copy=True),\n organic_like=rows.organic_like.to_numpy(dtype=np.int8, copy=True),\n )\n log(f\"loaded explicit events: rows={len(events):,} users={len(result):,}\")\n return result\n\n\ndef empty_explicit_events() -> ExplicitEvents:\n return ExplicitEvents(\n timestamps=np.empty(0, dtype=np.int64),\n items=np.empty(0, dtype=np.int32),\n channel=np.empty(0, dtype=np.int8),\n active=np.empty(0, dtype=np.int8),\n organic_like=np.empty(0, dtype=np.int8),\n )\n\n\ndef pack_active_items(\n active: dict[int, int], width: int, padding_item: int\n) -> np.ndarray:\n packed = np.full(width, padding_item, dtype=np.uint16)\n if not active:\n return packed\n ordered = sorted(active.items(), key=lambda pair: (-pair[1], pair[0]))[:width]\n packed[: len(ordered)] = np.fromiter(\n (item for item, _ in ordered), dtype=np.uint16, count=len(ordered)\n )\n return packed\n\n\ndef load_inference_state(\n path: Path,\n item_index: pd.Index,\n uids: np.ndarray,\n n_items: int,\n) -> tuple[np.ndarray, np.ndarray, np.ndarray, np.ndarray]:\n \"\"\"Pack the task-provided active explicit state.\"\"\"\n state = pd.read_parquet(path, columns=[\"uid\", \"item_id\", \"state\"])\n mapped = item_index.get_indexer(state.item_id.to_numpy(dtype=np.int64))\n keep = mapped >= 0\n#!/usr/bin/env python3\n\"\"\"Score a validation-stage ranking against public discovery labels.\n\n``build_task.py`` publishes this module with the solver-visible task files. It\nloads target users, validation eligibility, and validation-window events from\nthe adjacent ``data`` directory, then evaluates one ranking supplied on the\ncommand line. Stage-independent mechanics come from the adjacent public\n``ranking_evaluation.py`` module. The builder installs the same checked-in\nmodule in the private judge, so public and private scoring mechanics cannot\ndrift. A relevant candidate receives grade 3 for an organic like or grade 1 for\nan organic listen with at least 80 percent completion; a like takes precedence\nwhen both events exist.\n\nBefore scoring, the ranking must contain exactly 100 distinct eligible items\nfor every target user, with integer-valued ``uid``, ``item_id``, and ``rank``\ncolumns and ranks 1 through 100 exactly once per user. Extra columns are\nignored. Quality is graded NDCG@10, averaged only over users who have at least\none eligible relevant item in the validation window.\n\nThe evaluator prints a JSON object containing the model path and scores. It\ndoes not apply the task's pass threshold; its purpose is model development and\nselection. The private judge applies the threshold to the final submission.\n\nUsage::\n\n python evaluate_public.py \n\"\"\"\nfrom __future__ import annotations\n\nimport json\nimport sys\nfrom pathlib import Path\n\nimport pandas as pd\n\nfrom ranking_evaluation import (\n CandidateSet,\n RankingValidationError,\n ranked_items,\n read_ranking,\n score_rankings,\n validate_ranking,\n)\n\n\nHERE = Path(__file__).resolve().parent\nDATA = HERE / \"data\"\nLISTEN_STRONG = 80\n\n\ndef validation_truth(\n eligibility: CandidateSet, targets: set[int]\n) -> dict[int, dict[int, int]]:\n \"\"\"Build cutoff-correct graded relevance from public validation events.\n\n Only target-user events for eligible candidates are retained. Organic\n listens completed to at least 80 percent receive grade 1, and organic likes\n receive grade 3. Repeated user-item events are collapsed, and processing\n likes second ensures that grade 3 wins over grade 1.\n\n Args:\n eligibility: Validation-cutoff candidate membership service.\n targets: Complete set of target user IDs.\n\n Returns:\n A nested ``uid -> item_id -> grade`` mapping. Users without an eligible\n relevant event are omitted.\n \"\"\"\n listens = pd.read_parquet(DATA / \"val_listens.parquet\")\n likes = pd.read_parquet(DATA / \"val_likes.parquet\")\n strong = listens[\n listens.uid.isin(targets)\n & (listens.is_organic == 1)\n & (listens.played_ratio_pct >= LISTEN_STRONG)\n ][[\"uid\", \"item_id\"]].drop_duplicates()\n organic_likes = likes[\n likes.uid.isin(targets) & (likes.is_organic == 1)\n ][[\"uid\", \"item_id\"]].drop_duplicates()\n\n graded: dict[int, dict[int, int]] = {}\n for raw_uid, raw_item in strong.itertuples(index=False, name=None):\n uid, item = int(raw_uid), int(raw_item)\n if eligibility.is_eligible(uid, item):\n graded.setdefault(uid, {})[item] = 1\n for raw_uid, raw_item in organic_likes.itertuples(index=False, name=None):\n uid, item = int(raw_uid), int(raw_item)\n if eligibility.is_eligible(uid, item):\n graded.setdefault(uid, {})[item] = 3\n return graded\n\n\ndef load_submission(\n path: Path, eligibility: CandidateSet, targets: set[int]\n) -> dict[int, list[int]]:\n \"\"\"Load and validate a public validation ranking.\n\n Files ending in ``.parquet`` are read as parquet; every other suffix is\n read as CSV. The required columns must be integer-valued, cover exactly the\n target-user set, contain 100 rows and ranks 1 through 100 per user, avoid\n duplicate user-item pairs, and contain only cutoff-eligible items.\n\n Args:\n path: Ranking file to read.\n eligibility: Validation-cutoff candidate membership service.\n targets: Exact set of users the ranking must cover.\n\n Returns:\n A ``uid -> ranked item IDs`` mapping ordered by ascending rank.\n\n Raises:\n ValueError: If the ranking violates the required schema or invariants.\n \"\"\"\n frame = validate_ranking(read_ranking(path), targets)\n if not all(\n eligibility.is_eligible(uid, item)\n for uid, item in frame[[\"uid\", \"item_id\"]].itertuples(index=False, name=None)\n ):\n raise RankingValidationError(\n \"submission contains an item rejected by eligibility service\"\n )\n return ranked_items(frame)\n\n\ndef score(\n ranked: dict[int, list[int]],\n graded: dict[int, dict[int, int]],\n) -> dict[str, float | int]:\n \"\"\"Aggregate per-user NDCG@10 over users with public relevance labels.\n\n Args:\n ranked: Ranked item IDs for every target user.\n graded: Eligible validation relevance keyed by user and item.\n\n Returns:\n The six-decimal ``quality_ndcg@10`` value and number of scored users.\n \"\"\"\n return score_rankings(ranked, graded)\n\n\ndef main() -> None:\n \"\"\"Run the public evaluator CLI and print its JSON score report.\"\"\"\n targets_frame = pd.read_parquet(DATA / \"target_users.parquet\")\n targets = set(targets_frame.uid.astype(int))\n eligibility = CandidateSet(DATA / \"validation_eligible_candidates.npz\")\n graded = validation_truth(eligibility, targets)\n\n if len(sys.argv) != 2:\n raise SystemExit(\n \"usage: evaluate_public.py \"\n )\n path = Path(sys.argv[1])\n ranked = load_submission(path, eligibility, targets)\n print(json.dumps({\"model\": str(path), \"scores\": score(ranked, graded)}, indent=2))\n\n\nif __name__ == \"__main__\":\n main()\ncandidate_catalog.parquet 349352\ntarget_users.parquet 84127\ntest_eligible_candidates.npz 7736341\ntest_preference_state.parquet 1092329\ntrain_dislikes.parquet 857213\ntrain_likes.parquet 5374652\ntrain_listens.parquet 319183255\ntrain_undislikes.parquet 155988\ntrain_unlikes.parquet 1855885\nval_dislikes.parquet 36571\nval_likes.parquet 298484\nval_listens.parquet 9947609\nval_undislikes.parquet 7845\nval_unlikes.parquet 72536\nvalidation_eligible_candidates.npz 7573821\nvalidation_preference_state.parquet 1061761\n" } } ## Step 8 · agent · 2026-09-23T21:40:47.539Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:40:50.182Z { "code": "const r = await tools.exec_command({cmd:\"rg -n \\\"negative|loss|train_model|def main|ArgumentParser|partition|rank|sample|inbatch|uniform\\\" /task/current_model/train_current_model.py /task/current_model/two_tower_model.py\",\"workdir\":\"/app\",\"yield_time_ms\":10000,\"max_output_tokens\":20000}); text(r.output)\n" } ### Tool output · 2026-09-23T21:40:50.243Z Script completed Wall time 0.0 seconds Output: /task/current_model/two_tower_model.py:40: uniform_negatives: int = 24 /task/current_model/two_tower_model.py:41: inbatch_negatives: int = 8 /task/current_model/two_tower_model.py:42: inbatch_correction_power: float = 0.5 /task/current_model/two_tower_model.py:43: inbatch_correction_min: float = 0.25 /task/current_model/two_tower_model.py:44: inbatch_correction_max: float = 4.0 /task/current_model/two_tower_model.py:73: popularity_rank = catalog.popularity_rank.to_numpy(dtype=np.float64, copy=False) /task/current_model/two_tower_model.py:79: 1.0 - (popularity_rank - 1.0) / max(len(catalog) - 1, 1), /task/current_model/two_tower_model.py:346:def invalid_negative_mask( /task/current_model/two_tower_model.py:347: negatives: torch.Tensor, /task/current_model/two_tower_model.py:353: invalid = negatives.eq(targets[:, None]) /task/current_model/two_tower_model.py:354: invalid |= negatives[:, :, None].eq(context_items[:, None, :]).any(dim=2) /task/current_model/two_tower_model.py:355: invalid |= negatives[:, :, None].eq(liked_items[:, None, :]).any(dim=2) /task/current_model/two_tower_model.py:356: for column in range(1, negatives.shape[1]): /task/current_model/two_tower_model.py:357: invalid[:, column] |= negatives[:, column, None].eq( /task/current_model/two_tower_model.py:358: negatives[:, :column] /task/current_model/two_tower_model.py:363:def draw_filtered_mixed_negatives( /task/current_model/two_tower_model.py:368: uniform_count: int, /task/current_model/two_tower_model.py:369: inbatch_count: int, /task/current_model/two_tower_model.py:374: """Draw uniform and unique-target in-batch negatives.""" /task/current_model/two_tower_model.py:376: uniform = torch.randint( /task/current_model/two_tower_model.py:378: (batch_size, uniform_count), /task/current_model/two_tower_model.py:382: inbatch = torch.empty((batch_size, 0), dtype=torch.long, device="cpu") /task/current_model/two_tower_model.py:384: if inbatch_count: /task/current_model/two_tower_model.py:386: corrected_count = min(inbatch_count, max(len(unique_targets) - 1, 0)) /task/current_model/two_tower_model.py:396: inbatch = unique_targets[columns] /task/current_model/two_tower_model.py:397: if corrected_count < inbatch_count: /task/current_model/two_tower_model.py:400: (batch_size, inbatch_count - corrected_count), /task/current_model/two_tower_model.py:404: inbatch = torch.cat([inbatch, filler], dim=1) /task/current_model/two_tower_model.py:406: negatives_cpu = torch.cat([uniform, inbatch], dim=1) /task/current_model/two_tower_model.py:407: correction_cpu = torch.ones_like(negatives_cpu, dtype=torch.float32) /task/current_model/two_tower_model.py:410: :, uniform_count : uniform_count + corrected_count /task/current_model/two_tower_model.py:411: ] = item_correction[inbatch[:, :corrected_count]] /task/current_model/two_tower_model.py:412: negatives = negatives_cpu.to(device) /task/current_model/two_tower_model.py:415: invalid = invalid_negative_mask( /task/current_model/two_tower_model.py:416: negatives, targets, context_items, liked_items /task/current_model/two_tower_model.py:419: return negatives, correction /task/current_model/two_tower_model.py:426: negatives[invalid] = replacements /task/current_model/two_tower_model.py:428: invalid = invalid_negative_mask( /task/current_model/two_tower_model.py:429: negatives, targets, context_items, liked_items /task/current_model/two_tower_model.py:432: raise RuntimeError("mixed negative resampling failed false-negative filter") /task/current_model/two_tower_model.py:433: return negatives, correction /task/current_model/train_current_model.py:6:loss. The fast default retains each user's most recent 128 training targets and /task/current_model/train_current_model.py:9:computes all of its timestep losses and carries the detached GRU hidden state /task/current_model/train_current_model.py:13:normalization, raw dot-product retrieval, sample-weighted binary cross entropy, /task/current_model/train_current_model.py:14:and 24 uniform plus eight propensity-corrected unique in-batch negatives. Every /task/current_model/train_current_model.py:55: loss_microbatch_size: int = 65_536 /task/current_model/train_current_model.py:56: uniform_negatives: int = 24 /task/current_model/train_current_model.py:57: inbatch_negatives: int = 8 /task/current_model/train_current_model.py:58: inbatch_correction_power: float = 0.5 /task/current_model/train_current_model.py:59: inbatch_correction_min: float = 0.25 /task/current_model/train_current_model.py:60: inbatch_correction_max: float = 4.0 /task/current_model/train_current_model.py:61: negative_filter_scope: str = "full-training-history" /task/current_model/train_current_model.py:165: uniform_negatives=config.uniform_negatives, /task/current_model/train_current_model.py:166: inbatch_negatives=config.inbatch_negatives, /task/current_model/train_current_model.py:167: inbatch_correction_power=config.inbatch_correction_power, /task/current_model/train_current_model.py:168: inbatch_correction_min=config.inbatch_correction_min, /task/current_model/train_current_model.py:169: inbatch_correction_max=config.inbatch_correction_max, /task/current_model/train_current_model.py:346: "popularity_rank" /task/current_model/train_current_model.py:477: "event_time_feature": "exp-negative-gap-over-60-days", /task/current_model/train_current_model.py:562: config.inbatch_correction_power, /task/current_model/train_current_model.py:567: config.inbatch_correction_min, /task/current_model/train_current_model.py:568: config.inbatch_correction_max, /task/current_model/train_current_model.py:572: f"inbatch correction: min={correction.min():.3f} " /task/current_model/train_current_model.py:603: f"full-history false-negative filter: users={len(prepared.user_ids):,} " /task/current_model/train_current_model.py:609:def invalid_full_history_negatives( /task/current_model/train_current_model.py:610: negatives: np.ndarray, /task/current_model/train_current_model.py:616: """Return row-level invalid negatives using the complete training prefix.""" /task/current_model/train_current_model.py:617: byte_columns = negatives >> 3 /task/current_model/train_current_model.py:618: bit_columns = negatives & 7 /task/current_model/train_current_model.py:621: invalid |= negatives == targets[:, None] /task/current_model/train_current_model.py:622: invalid |= (negatives[:, :, None] == liked_items[:, None, :]).any(axis=2) /task/current_model/train_current_model.py:623: for column in range(1, negatives.shape[1]): /task/current_model/train_current_model.py:625: negatives[:, column, None] == negatives[:, :column] /task/current_model/train_current_model.py:630:def draw_full_history_filtered_negatives( /task/current_model/train_current_model.py:641: """Draw mixed negatives and reject all known public-training positives.""" /task/current_model/train_current_model.py:645: uniform = torch.randint( /task/current_model/train_current_model.py:647: (batch_size, config.uniform_negatives), /task/current_model/train_current_model.py:651: inbatch = torch.empty((batch_size, 0), dtype=torch.long) /task/current_model/train_current_model.py:653: if config.inbatch_negatives: /task/current_model/train_current_model.py:656: config.inbatch_negatives, max(len(unique_targets) - 1, 0) /task/current_model/train_current_model.py:671: inbatch = unique_targets[columns] /task/current_model/train_current_model.py:672: if corrected_count < config.inbatch_negatives: /task/current_model/train_current_model.py:675: (batch_size, config.inbatch_negatives - corrected_count), /task/current_model/train_current_model.py:679: inbatch = torch.cat([inbatch, filler], dim=1) /task/current_model/train_current_model.py:681: negatives = torch.cat([uniform, inbatch], dim=1).numpy() /task/current_model/train_current_model.py:682: correction = np.ones_like(negatives, dtype=np.float32) /task/current_model/train_current_model.py:685: :, config.uniform_negatives : config.uniform_negatives + corrected_count /task/current_model/train_current_model.py:686: ] = item_correction[inbatch[:, :corrected_count]].numpy() /task/current_model/train_current_model.py:688: invalid = invalid_full_history_negatives( /task/current_model/train_current_model.py:689: negatives, /task/current_model/train_current_model.py:697: torch.from_numpy(negatives).to(device), /task/current_model/train_current_model.py:706: negatives[invalid] = replacements /task/current_model/train_current_model.py:707: # Rejected in-batch items become ordinary uniform draws. /task/current_model/train_current_model.py:709: invalid = invalid_full_history_negatives( /task/current_model/train_current_model.py:710: negatives, /task/current_model/train_current_model.py:717: raise RuntimeError("full-history negative resampling failed") /task/current_model/train_current_model.py:719: torch.from_numpy(negatives).to(device), /task/current_model/train_current_model.py:724:def draw_training_negatives( /task/current_model/train_current_model.py:736: if config.negative_filter_scope == "full-training-history": /task/current_model/train_current_model.py:738: raise RuntimeError("full-history negative filter was not built") /task/current_model/train_current_model.py:739: return draw_full_history_filtered_negatives( /task/current_model/train_current_model.py:750: return base.draw_filtered_mixed_negatives( /task/current_model/train_current_model.py:755: config.uniform_negatives, /task/current_model/train_current_model.py:756: config.inbatch_negatives, /task/current_model/train_current_model.py:816: negatives: torch.Tensor, /task/current_model/train_current_model.py:818: all_items = torch.cat([positives, negatives.reshape(-1)]) /task/current_model/train_current_model.py:822: negative_vectors = encoded[inverse[len(positives) :]].reshape( /task/current_model/train_current_model.py:823: len(positives), negatives.shape[1], -1 /task/current_model/train_current_model.py:825: return positive_vectors, negative_vectors /task/current_model/train_current_model.py:845:def corrected_negative_loss( /task/current_model/train_current_model.py:851: total = config.uniform_negatives + config.inbatch_negatives /task/current_model/train_current_model.py:853: if config.uniform_negatives: /task/current_model/train_current_model.py:854: result += config.uniform_negatives * raw[ /task/current_model/train_current_model.py:855: :, : config.uniform_negatives /task/current_model/train_current_model.py:857: if config.inbatch_negatives: /task/current_model/train_current_model.py:858: selected = slice(config.uniform_negatives, total) /task/current_model/train_current_model.py:860: result += config.inbatch_negatives * ( /task/current_model/train_current_model.py:880: raise RuntimeError("chronological target partition produced negative counts") /task/current_model/train_current_model.py:888:def chronological_target_partition( /task/current_model/train_current_model.py:963: if config.target_weighting == "uniform": /task/current_model/train_current_model.py:1119: negatives: torch.Tensor, /task/current_model/train_current_model.py:1120: negative_weights: torch.Tensor, /task/current_model/train_current_model.py:1121: sample_weights: np.ndarray, /task/current_model/train_current_model.py:1127: total_weight = float(sample_weights.sum()) /task/current_model/train_current_model.py:1129: raise RuntimeError("target block has no positive sample weight") /task/current_model/train_current_model.py:1132: "loss_sum": 0.0, /task/current_model/train_current_model.py:1134: "negative_sum": 0.0, /task/current_model/train_current_model.py:1138: for begin in range(0, target_count, config.loss_microbatch_size): /task/current_model/train_current_model.py:1139: end = min(begin + config.loss_microbatch_size, target_count) /task/current_model/train_current_model.py:1162: positive_vectors, negative_vectors = candidate_vectors( /task/current_model/train_current_model.py:1165: negatives[begin:end], /task/current_model/train_current_model.py:1168: negative_logits = torch.einsum( /task/current_model/train_current_model.py:1169: "bd,bkd->bk", query_vectors, negative_vectors /task/current_model/train_current_model.py:1171: positive_loss = F.softplus(-positive_logits) /task/current_model/train_current_model.py:1172: negative_loss = corrected_negative_loss( /task/current_model/train_current_model.py:1173: negative_logits, negative_weights[begin:end], config /task/current_model/train_current_model.py:1176: sample_weights[begin:end].astype(np.float32, copy=False) /task/current_model/train_current_model.py:1178: loss_sum = ( /task/current_model/train_current_model.py:1179: selected_weights * (positive_loss + negative_loss) / 2.0 /task/current_model/train_current_model.py:1181: if not bool(torch.isfinite(loss_sum)): /task/current_model/train_current_model.py:1182: raise RuntimeError("dense next-item training produced non-finite loss") /task/current_model/train_current_model.py:1184: (loss_sum / total_weight).backward() /task/current_model/train_current_model.py:1188: statistics["loss_sum"] += float(loss_sum.detach().cpu()) /task/current_model/train_current_model.py:1190: statistics["negative_sum"] += float(negative_logits.detach().sum().cpu()) /task/current_model/train_current_model.py:1192: (positive_logits.detach()[:, None] > negative_logits.detach()).sum().cpu() /task/current_model/train_current_model.py:1227: negative_count = config.uniform_negatives + config.inbatch_negatives /task/current_model/train_current_model.py:1228: total_loss = 0.0 /task/current_model/train_current_model.py:1232: total_negative = 0.0 /task/current_model/train_current_model.py:1293: negatives, negative_weights = draw_training_negatives( /task/current_model/train_current_model.py:1314: negatives, /task/current_model/train_current_model.py:1315: negative_weights, /task/current_model/train_current_model.py:1327: total_loss += statistics["loss_sum"] /task/current_model/train_current_model.py:1331: total_negative += statistics["negative_sum"] /task/current_model/train_current_model.py:1337: batch_bce = statistics["loss_sum"] / max( /task/current_model/train_current_model.py:1340: running_bce = total_loss / max(total_weight, 1.0e-12) /task/current_model/train_current_model.py:1351: "loss": total_loss / max(total_weight, 1.0e-12), /task/current_model/train_current_model.py:1353: "negative_logit": total_negative / max(total_targets * negative_count, 1), /task/current_model/train_current_model.py:1355: / max(total_targets * negative_count, 1), /task/current_model/train_current_model.py:1388: total_loss = 0.0 /task/current_model/train_current_model.py:1449: negatives, negative_weights = draw_training_negatives( /task/current_model/train_current_model.py:1469: negatives, /task/current_model/train_current_model.py:1470: negative_weights, /task/current_model/train_current_model.py:1475: total_loss += statistics["loss_sum"] /task/current_model/train_current_model.py:1481: "validation_loss": total_loss / max(total_weight, 1.0e-12), /task/current_model/train_current_model.py:1521:def train_model( /task/current_model/train_current_model.py:1530: partition = chronological_target_partition( /task/current_model/train_current_model.py:1536: training_counts = partition.training_counts /task/current_model/train_current_model.py:1537: validation_counts = partition.validation_counts /task/current_model/train_current_model.py:1541: f"selected={partition.selected_count:,} " /task/current_model/train_current_model.py:1542: f"discarded_old_targets={int(partition.window_starts.sum()):,} " /task/current_model/train_current_model.py:1555: partition.window_starts, /task/current_model/train_current_model.py:1562: partition.history_training_counts, /task/current_model/train_current_model.py:1566: build_known_positive_filter(prepared, partition.history_training_counts) /task/current_model/train_current_model.py:1567: if config.negative_filter_scope == "full-training-history" /task/current_model/train_current_model.py:1571: best_loss = float("inf") /task/current_model/train_current_model.py:1601: "negative_filter_scope", "last-100" /task/current_model/train_current_model.py:1604: "target_weighting", "uniform" /task/current_model/train_current_model.py:1629: stored_filter_scope != config.negative_filter_scope /task/current_model/train_current_model.py:1657: prior.pop("validation_loss", None) /task/current_model/train_current_model.py:1660: f"{stored_filter_scope}->{config.negative_filter_scope}, " /task/current_model/train_current_model.py:1666: if "validation_loss" not in prior: /task/current_model/train_current_model.py:1673: partition.window_starts, /task/current_model/train_current_model.py:1682: best_loss = float(prior["validation_loss"]) /task/current_model/train_current_model.py:1687: f"loss={best_loss:.6f}" /task/current_model/train_current_model.py:1697: partition.window_starts, /task/current_model/train_current_model.py:1710: partition.window_starts, /task/current_model/train_current_model.py:1731: diagnostics["validation_loss"] /task/current_model/train_current_model.py:1732: < best_loss - config.early_stopping_min_delta /task/current_model/train_current_model.py:1735: best_loss = diagnostics["validation_loss"] /task/current_model/train_current_model.py:1754: f"epoch={epoch}/{config.epochs} train_loss={diagnostics['loss']:.5f} " /task/current_model/train_current_model.py:1755: f"validation_loss={diagnostics['validation_loss']:.5f} " /task/current_model/train_current_model.py:1766: f"best_epoch={best_epoch} best_validation_loss={best_loss:.6f}" /task/current_model/train_current_model.py:1776: f"loss={best_loss:.6f}" /task/current_model/train_current_model.py:1861:def rank_candidates( /task/current_model/train_current_model.py:1867: ranking_batch_size: int, /task/current_model/train_current_model.py:1882: for start in range(0, len(eligibility.uids), ranking_batch_size): /task/current_model/train_current_model.py:1883: end = min(start + ranking_batch_size, len(eligibility.uids)) /task/current_model/train_current_model.py:1896: (uid, int(prepared.item_ids[column]), rank) /task/current_model/train_current_model.py:1897: for rank, column in enumerate(columns, start=1) /task/current_model/train_current_model.py:1900: log(f"ranked users={end:,}/{len(eligibility.uids):,}") /task/current_model/train_current_model.py:1909: return pd.DataFrame(rows, columns=["uid", "item_id", "rank"]), diagnostics /task/current_model/train_current_model.py:1912:def write_ranking(frame: pd.DataFrame, output: Path) -> None: /task/current_model/train_current_model.py:1922:def main() -> int: /task/current_model/train_current_model.py:1923: parser = argparse.ArgumentParser(description=__doc__) /task/current_model/train_current_model.py:1939: "--loss-microbatch-size", /task/current_model/train_current_model.py:1941: default=Config.loss_microbatch_size, /task/current_model/train_current_model.py:1944: "--negative-filter-scope", /task/current_model/train_current_model.py:1946: default=Config.negative_filter_scope, /task/current_model/train_current_model.py:1950: choices=("discovery-graded", "organic-strong", "uniform"), /task/current_model/train_current_model.py:2003: parser.add_argument("--ranking-batch-size", type=int, default=64) /task/current_model/train_current_model.py:2012: or args.loss_microbatch_size < 1 /task/current_model/train_current_model.py:2033: loss_microbatch_size=args.loss_microbatch_size, /task/current_model/train_current_model.py:2034: negative_filter_scope=args.negative_filter_scope, /task/current_model/train_current_model.py:2061: target_partition = chronological_target_partition( /task/current_model/train_current_model.py:2076: target_partition.training_counts.sum() /task/current_model/train_current_model.py:2079: target_partition.validation_counts.sum() /task/current_model/train_current_model.py:2082: target_partition.window_starts.sum() /task/current_model/train_current_model.py:2093: model, training_history = train_model( /task/current_model/train_current_model.py:2102: ranking, embedding_diagnostics = rank_candidates( /task/current_model/train_current_model.py:2108: args.ranking_batch_size, /task/current_model/train_current_model.py:2110: write_ranking(ranking, args.output.resolve()) /task/current_model/train_current_model.py:2117: "rows": len(ranking), /task/current_model/train_current_model.py:2118: "users": int(ranking.uid.nunique()), /task/current_model/train_current_model.py:2126: "sequence_encoder": "one-layer-GRU-dense-timestep-loss", /task/current_model/train_current_model.py:2129: "loss_execution": "gradient-accumulated-microbatches", /task/current_model/train_current_model.py:2135: "objective": "sample-weighted-BCE-at-every-timestep", /task/current_model/train_current_model.py:2136: "negative_sampling": ( /task/current_model/train_current_model.py:2137: "24-uniform-plus-8-propensity-corrected-inbatch" /task/current_model/train_current_model.py:2139: "false_negative_filter": config.negative_filter_scope, /task/current_model/train_current_model.py:2146: target_partition.training_counts.sum() /task/current_model/train_current_model.py:2149: target_partition.validation_counts.sum() /task/current_model/train_current_model.py:2151: "discarded_old_targets": int(target_partition.window_starts.sum()), ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-f36e5bb8-bab3-404a-a47b-6f67bf95aac8", "process_id": "69967", "command": [ "/bin/sh", "-lc", "rg -n \"negative|loss|train_model|def main|ArgumentParser|partition|rank|sample|inbatch|uniform\" /task/current_model/train_current_model.py /task/current_model/two_tower_model.py" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "search", "cmd": "rg -n 'negative|loss|train_model|def main|ArgumentParser|partition|rank|sample|inbatch|uniform' /task/current_model/train_current_model.py /task/current_model/two_tower_model.py", "query": "negative|loss|train_model|def main|ArgumentParser|partition|rank|sample|inbatch|uniform", "path": "train_current_model.py" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "/task/current_model/two_tower_model.py:40: uniform_negatives: int = 24\n/task/current_model/two_tower_model.py:41: inbatch_negatives: int = 8\n/task/current_model/two_tower_model.py:42: inbatch_correction_power: float = 0.5\n/task/current_model/two_tower_model.py:43: inbatch_correction_min: float = 0.25\n/task/current_model/two_tower_model.py:44: inbatch_correction_max: float = 4.0\n/task/current_model/two_tower_model.py:73: popularity_rank = catalog.popularity_rank.to_numpy(dtype=np.float64, copy=False)\n/task/current_model/two_tower_model.py:79: 1.0 - (popularity_rank - 1.0) / max(len(catalog) - 1, 1),\n/task/current_model/two_tower_model.py:346:def invalid_negative_mask(\n/task/current_model/two_tower_model.py:347: negatives: torch.Tensor,\n/task/current_model/two_tower_model.py:353: invalid = negatives.eq(targets[:, None])\n/task/current_model/two_tower_model.py:354: invalid |= negatives[:, :, None].eq(context_items[:, None, :]).any(dim=2)\n/task/current_model/two_tower_model.py:355: invalid |= negatives[:, :, None].eq(liked_items[:, None, :]).any(dim=2)\n/task/current_model/two_tower_model.py:356: for column in range(1, negatives.shape[1]):\n/task/current_model/two_tower_model.py:357: invalid[:, column] |= negatives[:, column, None].eq(\n/task/current_model/two_tower_model.py:358: negatives[:, :column]\n/task/current_model/two_tower_model.py:363:def draw_filtered_mixed_negatives(\n/task/current_model/two_tower_model.py:368: uniform_count: int,\n/task/current_model/two_tower_model.py:369: inbatch_count: int,\n/task/current_model/two_tower_model.py:374: \"\"\"Draw uniform and unique-target in-batch negatives.\"\"\"\n/task/current_model/two_tower_model.py:376: uniform = torch.randint(\n/task/current_model/two_tower_model.py:378: (batch_size, uniform_count),\n/task/current_model/two_tower_model.py:382: inbatch = torch.empty((batch_size, 0), dtype=torch.long, device=\"cpu\")\n/task/current_model/two_tower_model.py:384: if inbatch_count:\n/task/current_model/two_tower_model.py:386: corrected_count = min(inbatch_count, max(len(unique_targets) - 1, 0))\n/task/current_model/two_tower_model.py:396: inbatch = unique_targets[columns]\n/task/current_model/two_tower_model.py:397: if corrected_count < inbatch_count:\n/task/current_model/two_tower_model.py:400: (batch_size, inbatch_count - corrected_count),\n/task/current_model/two_tower_model.py:404: inbatch = torch.cat([inbatch, filler], dim=1)\n/task/current_model/two_tower_model.py:406: negatives_cpu = torch.cat([uniform, inbatch], dim=1)\n/task/current_model/two_tower_model.py:407: correction_cpu = torch.ones_like(negatives_cpu, dtype=torch.float32)\n/task/current_model/two_tower_model.py:410: :, uniform_count : uniform_count + corrected_count\n/task/current_model/two_tower_model.py:411: ] = item_correction[inbatch[:, :corrected_count]]\n/task/current_model/two_tower_model.py:412: negatives = negatives_cpu.to(device)\n/task/current_model/two_tower_model.py:415: invalid = invalid_negative_mask(\n/task/current_model/two_tower_model.py:416: negatives, targets, context_items, liked_items\n/task/current_model/two_tower_model.py:419: return negatives, correction\n/task/current_model/two_tower_model.py:426: negatives[invalid] = replacements\n/task/current_model/two_tower_model.py:428: invalid = invalid_negative_mask(\n/task/current_model/two_tower_model.py:429: negatives, targets, context_items, liked_items\n/task/current_model/two_tower_model.py:432: raise RuntimeError(\"mixed negative resampling failed false-negative filter\")\n/task/current_model/two_tower_model.py:433: return negatives, correction\n/task/current_model/train_current_model.py:6:loss. The fast default retains each user's most recent 128 training targets and\n/task/current_model/train_current_model.py:9:computes all of its timestep losses and carries the detached GRU hidden state\n/task/current_model/train_current_model.py:13:normalization, raw dot-product retrieval, sample-weighted binary cross entropy,\n/task/current_model/train_current_model.py:14:and 24 uniform plus eight propensity-corrected unique in-batch negatives. Every\n/task/current_model/train_current_model.py:55: loss_microbatch_size: int = 65_536\n/task/current_model/train_current_model.py:56: uniform_negatives: int = 24\n/task/current_model/train_current_model.py:57: inbatch_negatives: int = 8\n/task/current_model/train_current_model.py:58: inbatch_correction_power: float = 0.5\n/task/current_model/train_current_model.py:59: inbatch_correction_min: float = 0.25\n/task/current_model/train_current_model.py:60: inbatch_correction_max: float = 4.0\n/task/current_model/train_current_model.py:61: negative_filter_scope: str = \"full-training-history\"\n/task/current_model/train_current_model.py:165: uniform_negatives=config.uniform_negatives,\n/task/current_model/train_current_model.py:166: inbatch_negatives=config.inbatch_negatives,\n/task/current_model/train_current_model.py:167: inbatch_correction_power=config.inbatch_correction_power,\n/task/current_model/train_current_model.py:168: inbatch_correction_min=config.inbatch_correction_min,\n/task/current_model/train_current_model.py:169: inbatch_correction_max=config.inbatch_correction_max,\n/task/current_model/train_current_model.py:346: \"popularity_rank\"\n/task/current_model/train_current_model.py:477: \"event_time_feature\": \"exp-negative-gap-over-60-days\",\n/task/current_model/train_current_model.py:562: config.inbatch_correction_power,\n/task/current_model/train_current_model.py:567: config.inbatch_correction_min,\n/task/current_model/train_current_model.py:568: config.inbatch_correction_max,\n/task/current_model/train_current_model.py:572: f\"inbatch correction: min={correction.min():.3f} \"\n/task/current_model/train_current_model.py:603: f\"full-history false-negative filter: users={len(prepared.user_ids):,} \"\n/task/current_model/train_current_model.py:609:def invalid_full_history_negatives(\n/task/current_model/train_current_model.py:610: negatives: np.ndarray,\n/task/current_model/train_current_model.py:616: \"\"\"Return row-level invalid negatives using the complete training prefix.\"\"\"\n/task/current_model/train_current_model.py:617: byte_columns = negatives >> 3\n/task/current_model/train_current_model.py:618: bit_columns = negatives & 7\n/task/current_model/train_current_model.py:621: invalid |= negatives == targets[:, None]\n/task/current_model/train_current_model.py:622: invalid |= (negatives[:, :, None] == liked_items[:, None, :]).any(axis=2)\n/task/current_model/train_current_model.py:623: for column in range(1, negatives.shape[1]):\n/task/current_model/train_current_model.py:625: negatives[:, column, None] == negatives[:, :column]\n/task/current_model/train_current_model.py:630:def draw_full_history_filtered_negatives(\n/task/current_model/train_current_model.py:641: \"\"\"Draw mixed negatives and reject all known public-training positives.\"\"\"\n/task/current_model/train_current_model.py:645: uniform = torch.randint(\n/task/current_model/train_current_model.py:647: (batch_size, config.uniform_negatives),\n/task/current_model/train_current_model.py:651: inbatch = torch.empty((batch_size, 0), dtype=torch.long)\n/task/current_model/train_current_model.py:653: if config.inbatch_negatives:\n/task/current_model/train_current_model.py:656: config.inbatch_negatives, max(len(unique_targets) - 1, 0)\n/task/current_model/train_current_model.py:671: inbatch = unique_targets[columns]\n/task/current_model/train_current_model.py:672: if corrected_count < config.inbatch_negatives:\n/task/current_model/train_current_model.py:675: (batch_size, config.inbatch_negatives - corrected_count),\n/task/current_model/train_current_model.py:679: inbatch = torch.cat([inbatch, filler], dim=1)\n/task/current_model/train_current_model.py:681: negatives = torch.cat([uniform, inbatch], dim=1).numpy()\n/task/current_model/train_current_model.py:682: correction = np.ones_like(negatives, dtype=np.float32)\n/task/current_model/train_current_model.py:685: :, config.uniform_negatives : config.uniform_negatives + corrected_count\n/task/current_model/train_current_model.py:686: ] = item_correction[inbatch[:, :corrected_count]].numpy()\n/task/current_model/train_current_model.py:688: invalid = invalid_full_history_negatives(\n/task/current_model/train_current_model.py:689: negatives,\n/task/current_model/train_current_model.py:697: torch.from_numpy(negatives).to(device),\n/task/current_model/train_current_model.py:706: negatives[invalid] = replacements\n/task/current_model/train_current_model.py:707: # Rejected in-batch items become ordinary uniform draws.\n/task/current_model/train_current_model.py:709: invalid = invalid_full_history_negatives(\n/task/current_model/train_current_model.py:710: negatives,\n/task/current_model/train_current_model.py:717: raise RuntimeError(\"full-history negative resampling failed\")\n/task/current_model/train_current_model.py:719: torch.from_numpy(negatives).to(device),\n/task/current_model/train_current_model.py:724:def draw_training_negatives(\n/task/current_model/train_current_model.py:736: if config.negative_filter_scope == \"full-training-history\":\n/task/current_model/train_current_model.py:738: raise RuntimeError(\"full-history negative filter was not built\")\n/task/current_model/train_current_model.py:739: return draw_full_history_filtered_negatives(\n/task/current_model/train_current_model.py:750: return base.draw_filtered_mixed_negatives(\n/task/current_model/train_current_model.py:755: config.uniform_negatives,\n/task/current_model/train_current_model.py:756: config.inbatch_negatives,\n/task/current_model/train_current_model.py:816: negatives: torch.Tensor,\n/task/current_model/train_current_model.py:818: all_items = torch.cat([positives, negatives.reshape(-1)])\n/task/current_model/train_current_model.py:822: negative_vectors = encoded[inverse[len(positives) :]].reshape(\n/task/current_model/train_current_model.py:823: len(positives), negatives.shape[1], -1\n/task/current_model/train_current_model.py:825: return positive_vectors, negative_vectors\n/task/current_model/train_current_model.py:845:def corrected_negative_loss(\n/task/current_model/train_current_model.py:851: total = config.uniform_negatives + config.inbatch_negatives\n/task/current_model/train_current_model.py:853: if config.uniform_negatives:\n/task/current_model/train_current_model.py:854: result += config.uniform_negatives * raw[\n/task/current_model/train_current_model.py:855: :, : config.uniform_negatives\n/task/current_model/train_current_model.py:857: if config.inbatch_negatives:\n/task/current_model/train_current_model.py:858: selected = slice(config.uniform_negatives, total)\n/task/current_model/train_current_model.py:860: result += config.inbatch_negatives * (\n/task/current_model/train_current_model.py:880: raise RuntimeError(\"chronological target partition produced negative counts\")\n/task/current_model/train_current_model.py:888:def chronological_target_partition(\n/task/current_model/train_current_model.py:963: if config.target_weighting == \"uniform\":\n/task/current_model/train_current_model.py:1119: negatives: torch.Tensor,\n/task/current_model/train_current_model.py:1120: negative_weights: torch.Tensor,\n/task/current_model/train_current_model.py:1121: sample_weights: np.ndarray,\n/task/current_model/train_current_model.py:1127: total_weight = float(sample_weights.sum())\n/task/current_model/train_current_model.py:1129: raise RuntimeError(\"target block has no positive sample weight\")\n/task/current_model/train_current_model.py:1132: \"loss_sum\": 0.0,\n/task/current_model/train_current_model.py:1134: \"negative_sum\": 0.0,\n/task/current_model/train_current_model.py:1138: for begin in range(0, target_count, config.loss_microbatch_size):\n/task/current_model/train_current_model.py:1139: end = min(begin + config.loss_microbatch_size, target_count)\n/task/current_model/train_current_model.py:1162: positive_vectors, negative_vectors = candidate_vectors(\n/task/current_model/train_current_model.py:1165: negatives[begin:end],\n/task/current_model/train_current_model.py:1168: negative_logits = torch.einsum(\n/task/current_model/train_current_model.py:1169: \"bd,bkd->bk\", query_vectors, negative_vectors\n/task/current_model/train_current_model.py:1171: positive_loss = F.softplus(-positive_logits)\n/task/current_model/train_current_model.py:1172: negative_loss = corrected_negative_loss(\n/task/current_model/train_current_model.py:1173: negative_logits, negative_weights[begin:end], config\n/task/current_model/train_current_model.py:1176: sample_weights[begin:end].astype(np.float32, copy=False)\n/task/current_model/train_current_model.py:1178: loss_sum = (\n/task/current_model/train_current_model.py:1179: selected_weights * (positive_loss + negative_loss) / 2.0\n/task/current_model/train_current_model.py:1181: if not bool(torch.isfinite(loss_sum)):\n/task/current_model/train_current_model.py:1182: raise RuntimeError(\"dense next-item training produced non-finite loss\")\n/task/current_model/train_current_model.py:1184: (loss_sum / total_weight).backward()\n/task/current_model/train_current_model.py:1188: statistics[\"loss_sum\"] += float(loss_sum.detach().cpu())\n/task/current_model/train_current_model.py:1190: statistics[\"negative_sum\"] += float(negative_logits.detach().sum().cpu())\n/task/current_model/train_current_model.py:1192: (positive_logits.detach()[:, None] > negative_logits.detach()).sum().cpu()\n/task/current_model/train_current_model.py:1227: negative_count = config.uniform_negatives + config.inbatch_negatives\n/task/current_model/train_current_model.py:1228: total_loss = 0.0\n/task/current_model/train_current_model.py:1232: total_negative = 0.0\n/task/current_model/train_current_model.py:1293: negatives, negative_weights = draw_training_negatives(\n/task/current_model/train_current_model.py:1314: negatives,\n/task/current_model/train_current_model.py:1315: negative_weights,\n/task/current_model/train_current_model.py:1327: total_loss += statistics[\"loss_sum\"]\n/task/current_model/train_current_model.py:1331: total_negative += statistics[\"negative_sum\"]\n/task/current_model/train_current_model.py:1337: batch_bce = statistics[\"loss_sum\"] / max(\n/task/current_model/train_current_model.py:1340: running_bce = total_loss / max(total_weight, 1.0e-12)\n/task/current_model/train_current_model.py:1351: \"loss\": total_loss / max(total_weight, 1.0e-12),\n/task/current_model/train_current_model.py:1353: \"negative_logit\": total_negative / max(total_targets * negative_count, 1),\n/task/current_model/train_current_model.py:1355: / max(total_targets * negative_count, 1),\n/task/current_model/train_current_model.py:1388: total_loss = 0.0\n/task/current_model/train_current_model.py:1449: negatives, negative_weights = draw_training_negatives(\n/task/current_model/train_current_model.py:1469: negatives,\n/task/current_model/train_current_model.py:1470: negative_weights,\n/task/current_model/train_current_model.py:1475: total_loss += statistics[\"loss_sum\"]\n/task/current_model/train_current_model.py:1481: \"validation_loss\": total_loss / max(total_weight, 1.0e-12),\n/task/current_model/train_current_model.py:1521:def train_model(\n/task/current_model/train_current_model.py:1530: partition = chronological_target_partition(\n/task/current_model/train_current_model.py:1536: training_counts = partition.training_counts\n/task/current_model/train_current_model.py:1537: validation_counts = partition.validation_counts\n/task/current_model/train_current_model.py:1541: f\"selected={partition.selected_count:,} \"\n/task/current_model/train_current_model.py:1542: f\"discarded_old_targets={int(partition.window_starts.sum()):,} \"\n/task/current_model/train_current_model.py:1555: partition.window_starts,\n/task/current_model/train_current_model.py:1562: partition.history_training_counts,\n/task/current_model/train_current_model.py:1566: build_known_positive_filter(prepared, partition.history_training_counts)\n/task/current_model/train_current_model.py:1567: if config.negative_filter_scope == \"full-training-history\"\n/task/current_model/train_current_model.py:1571: best_loss = float(\"inf\")\n/task/current_model/train_current_model.py:1601: \"negative_filter_scope\", \"last-100\"\n/task/current_model/train_current_model.py:1604: \"target_weighting\", \"uniform\"\n/task/current_model/train_current_model.py:1629: stored_filter_scope != config.negative_filter_scope\n/task/current_model/train_current_model.py:1657: prior.pop(\"validation_loss\", None)\n/task/current_model/train_current_model.py:1660: f\"{stored_filter_scope}->{config.negative_filter_scope}, \"\n/task/current_model/train_current_model.py:1666: if \"validation_loss\" not in prior:\n/task/current_model/train_current_model.py:1673: partition.window_starts,\n/task/current_model/train_current_model.py:1682: best_loss = float(prior[\"validation_loss\"])\n/task/current_model/train_current_model.py:1687: f\"loss={best_loss:.6f}\"\n/task/current_model/train_current_model.py:1697: partition.window_starts,\n/task/current_model/train_current_model.py:1710: partition.window_starts,\n/task/current_model/train_current_model.py:1731: diagnostics[\"validation_loss\"]\n/task/current_model/train_current_model.py:1732: < best_loss - config.early_stopping_min_delta\n/task/current_model/train_current_model.py:1735: best_loss = diagnostics[\"validation_loss\"]\n/task/current_model/train_current_model.py:1754: f\"epoch={epoch}/{config.epochs} train_loss={diagnostics['loss']:.5f} \"\n/task/current_model/train_current_model.py:1755: f\"validation_loss={diagnostics['validation_loss']:.5f} \"\n/task/current_model/train_current_model.py:1766: f\"best_epoch={best_epoch} best_validation_loss={best_loss:.6f}\"\n/task/current_model/train_current_model.py:1776: f\"loss={best_loss:.6f}\"\n/task/current_model/train_current_model.py:1861:def rank_candidates(\n/task/current_model/train_current_model.py:1867: ranking_batch_size: int,\n/task/current_model/train_current_model.py:1882: for start in range(0, len(eligibility.uids), ranking_batch_size):\n/task/current_model/train_current_model.py:1883: end = min(start + ranking_batch_size, len(eligibility.uids))\n/task/current_model/train_current_model.py:1896: (uid, int(prepared.item_ids[column]), rank)\n/task/current_model/train_current_model.py:1897: for rank, column in enumerate(columns, start=1)\n/task/current_model/train_current_model.py:1900: log(f\"ranked users={end:,}/{len(eligibility.uids):,}\")\n/task/current_model/train_current_model.py:1909: return pd.DataFrame(rows, columns=[\"uid\", \"item_id\", \"rank\"]), diagnostics\n/task/current_model/train_current_model.py:1912:def write_ranking(frame: pd.DataFrame, output: Path) -> None:\n/task/current_model/train_current_model.py:1922:def main() -> int:\n/task/current_model/train_current_model.py:1923: parser = argparse.ArgumentParser(description=__doc__)\n/task/current_model/train_current_model.py:1939: \"--loss-microbatch-size\",\n/task/current_model/train_current_model.py:1941: default=Config.loss_microbatch_size,\n/task/current_model/train_current_model.py:1944: \"--negative-filter-scope\",\n/task/current_model/train_current_model.py:1946: default=Config.negative_filter_scope,\n/task/current_model/train_current_model.py:1950: choices=(\"discovery-graded\", \"organic-strong\", \"uniform\"),\n/task/current_model/train_current_model.py:2003: parser.add_argument(\"--ranking-batch-size\", type=int, default=64)\n/task/current_model/train_current_model.py:2012: or args.loss_microbatch_size < 1\n/task/current_model/train_current_model.py:2033: loss_microbatch_size=args.loss_microbatch_size,\n/task/current_model/train_current_model.py:2034: negative_filter_scope=args.negative_filter_scope,\n/task/current_model/train_current_model.py:2061: target_partition = chronological_target_partition(\n/task/current_model/train_current_model.py:2076: target_partition.training_counts.sum()\n/task/current_model/train_current_model.py:2079: target_partition.validation_counts.sum()\n/task/current_model/train_current_model.py:2082: target_partition.window_starts.sum()\n/task/current_model/train_current_model.py:2093: model, training_history = train_model(\n/task/current_model/train_current_model.py:2102: ranking, embedding_diagnostics = rank_candidates(\n/task/current_model/train_current_model.py:2108: args.ranking_batch_size,\n/task/current_model/train_current_model.py:2110: write_ranking(ranking, args.output.resolve())\n/task/current_model/train_current_model.py:2117: \"rows\": len(ranking),\n/task/current_model/train_current_model.py:2118: \"users\": int(ranking.uid.nunique()),\n/task/current_model/train_current_model.py:2126: \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n/task/current_model/train_current_model.py:2129: \"loss_execution\": \"gradient-accumulated-microbatches\",\n/task/current_model/train_current_model.py:2135: \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n/task/current_model/train_current_model.py:2136: \"negative_sampling\": (\n/task/current_model/train_current_model.py:2137: \"24-uniform-plus-8-propensity-corrected-inbatch\"\n/task/current_model/train_current_model.py:2139: \"false_negative_filter\": config.negative_filter_scope,\n/task/current_model/train_current_model.py:2146: target_partition.training_counts.sum()\n/task/current_model/train_current_model.py:2149: target_partition.validation_counts.sum()\n/task/current_model/train_current_model.py:2151: \"discarded_old_targets\": int(target_partition.window_starts.sum()),\n", "stderr": "", "aggregated_output": "/task/current_model/two_tower_model.py:40: uniform_negatives: int = 24\n/task/current_model/two_tower_model.py:41: inbatch_negatives: int = 8\n/task/current_model/two_tower_model.py:42: inbatch_correction_power: float = 0.5\n/task/current_model/two_tower_model.py:43: inbatch_correction_min: float = 0.25\n/task/current_model/two_tower_model.py:44: inbatch_correction_max: float = 4.0\n/task/current_model/two_tower_model.py:73: popularity_rank = catalog.popularity_rank.to_numpy(dtype=np.float64, copy=False)\n/task/current_model/two_tower_model.py:79: 1.0 - (popularity_rank - 1.0) / max(len(catalog) - 1, 1),\n/task/current_model/two_tower_model.py:346:def invalid_negative_mask(\n/task/current_model/two_tower_model.py:347: negatives: torch.Tensor,\n/task/current_model/two_tower_model.py:353: invalid = negatives.eq(targets[:, None])\n/task/current_model/two_tower_model.py:354: invalid |= negatives[:, :, None].eq(context_items[:, None, :]).any(dim=2)\n/task/current_model/two_tower_model.py:355: invalid |= negatives[:, :, None].eq(liked_items[:, None, :]).any(dim=2)\n/task/current_model/two_tower_model.py:356: for column in range(1, negatives.shape[1]):\n/task/current_model/two_tower_model.py:357: invalid[:, column] |= negatives[:, column, None].eq(\n/task/current_model/two_tower_model.py:358: negatives[:, :column]\n/task/current_model/two_tower_model.py:363:def draw_filtered_mixed_negatives(\n/task/current_model/two_tower_model.py:368: uniform_count: int,\n/task/current_model/two_tower_model.py:369: inbatch_count: int,\n/task/current_model/two_tower_model.py:374: \"\"\"Draw uniform and unique-target in-batch negatives.\"\"\"\n/task/current_model/two_tower_model.py:376: uniform = torch.randint(\n/task/current_model/two_tower_model.py:378: (batch_size, uniform_count),\n/task/current_model/two_tower_model.py:382: inbatch = torch.empty((batch_size, 0), dtype=torch.long, device=\"cpu\")\n/task/current_model/two_tower_model.py:384: if inbatch_count:\n/task/current_model/two_tower_model.py:386: corrected_count = min(inbatch_count, max(len(unique_targets) - 1, 0))\n/task/current_model/two_tower_model.py:396: inbatch = unique_targets[columns]\n/task/current_model/two_tower_model.py:397: if corrected_count < inbatch_count:\n/task/current_model/two_tower_model.py:400: (batch_size, inbatch_count - corrected_count),\n/task/current_model/two_tower_model.py:404: inbatch = torch.cat([inbatch, filler], dim=1)\n/task/current_model/two_tower_model.py:406: negatives_cpu = torch.cat([uniform, inbatch], dim=1)\n/task/current_model/two_tower_model.py:407: correction_cpu = torch.ones_like(negatives_cpu, dtype=torch.float32)\n/task/current_model/two_tower_model.py:410: :, uniform_count : uniform_count + corrected_count\n/task/current_model/two_tower_model.py:411: ] = item_correction[inbatch[:, :corrected_count]]\n/task/current_model/two_tower_model.py:412: negatives = negatives_cpu.to(device)\n/task/current_model/two_tower_model.py:415: invalid = invalid_negative_mask(\n/task/current_model/two_tower_model.py:416: negatives, targets, context_items, liked_items\n/task/current_model/two_tower_model.py:419: return negatives, correction\n/task/current_model/two_tower_model.py:426: negatives[invalid] = replacements\n/task/current_model/two_tower_model.py:428: invalid = invalid_negative_mask(\n/task/current_model/two_tower_model.py:429: negatives, targets, context_items, liked_items\n/task/current_model/two_tower_model.py:432: raise RuntimeError(\"mixed negative resampling failed false-negative filter\")\n/task/current_model/two_tower_model.py:433: return negatives, correction\n/task/current_model/train_current_model.py:6:loss. The fast default retains each user's most recent 128 training targets and\n/task/current_model/train_current_model.py:9:computes all of its timestep losses and carries the detached GRU hidden state\n/task/current_model/train_current_model.py:13:normalization, raw dot-product retrieval, sample-weighted binary cross entropy,\n/task/current_model/train_current_model.py:14:and 24 uniform plus eight propensity-corrected unique in-batch negatives. Every\n/task/current_model/train_current_model.py:55: loss_microbatch_size: int = 65_536\n/task/current_model/train_current_model.py:56: uniform_negatives: int = 24\n/task/current_model/train_current_model.py:57: inbatch_negatives: int = 8\n/task/current_model/train_current_model.py:58: inbatch_correction_power: float = 0.5\n/task/current_model/train_current_model.py:59: inbatch_correction_min: float = 0.25\n/task/current_model/train_current_model.py:60: inbatch_correction_max: float = 4.0\n/task/current_model/train_current_model.py:61: negative_filter_scope: str = \"full-training-history\"\n/task/current_model/train_current_model.py:165: uniform_negatives=config.uniform_negatives,\n/task/current_model/train_current_model.py:166: inbatch_negatives=config.inbatch_negatives,\n/task/current_model/train_current_model.py:167: inbatch_correction_power=config.inbatch_correction_power,\n/task/current_model/train_current_model.py:168: inbatch_correction_min=config.inbatch_correction_min,\n/task/current_model/train_current_model.py:169: inbatch_correction_max=config.inbatch_correction_max,\n/task/current_model/train_current_model.py:346: \"popularity_rank\"\n/task/current_model/train_current_model.py:477: \"event_time_feature\": \"exp-negative-gap-over-60-days\",\n/task/current_model/train_current_model.py:562: config.inbatch_correction_power,\n/task/current_model/train_current_model.py:567: config.inbatch_correction_min,\n/task/current_model/train_current_model.py:568: config.inbatch_correction_max,\n/task/current_model/train_current_model.py:572: f\"inbatch correction: min={correction.min():.3f} \"\n/task/current_model/train_current_model.py:603: f\"full-history false-negative filter: users={len(prepared.user_ids):,} \"\n/task/current_model/train_current_model.py:609:def invalid_full_history_negatives(\n/task/current_model/train_current_model.py:610: negatives: np.ndarray,\n/task/current_model/train_current_model.py:616: \"\"\"Return row-level invalid negatives using the complete training prefix.\"\"\"\n/task/current_model/train_current_model.py:617: byte_columns = negatives >> 3\n/task/current_model/train_current_model.py:618: bit_columns = negatives & 7\n/task/current_model/train_current_model.py:621: invalid |= negatives == targets[:, None]\n/task/current_model/train_current_model.py:622: invalid |= (negatives[:, :, None] == liked_items[:, None, :]).any(axis=2)\n/task/current_model/train_current_model.py:623: for column in range(1, negatives.shape[1]):\n/task/current_model/train_current_model.py:625: negatives[:, column, None] == negatives[:, :column]\n/task/current_model/train_current_model.py:630:def draw_full_history_filtered_negatives(\n/task/current_model/train_current_model.py:641: \"\"\"Draw mixed negatives and reject all known public-training positives.\"\"\"\n/task/current_model/train_current_model.py:645: uniform = torch.randint(\n/task/current_model/train_current_model.py:647: (batch_size, config.uniform_negatives),\n/task/current_model/train_current_model.py:651: inbatch = torch.empty((batch_size, 0), dtype=torch.long)\n/task/current_model/train_current_model.py:653: if config.inbatch_negatives:\n/task/current_model/train_current_model.py:656: config.inbatch_negatives, max(len(unique_targets) - 1, 0)\n/task/current_model/train_current_model.py:671: inbatch = unique_targets[columns]\n/task/current_model/train_current_model.py:672: if corrected_count < config.inbatch_negatives:\n/task/current_model/train_current_model.py:675: (batch_size, config.inbatch_negatives - corrected_count),\n/task/current_model/train_current_model.py:679: inbatch = torch.cat([inbatch, filler], dim=1)\n/task/current_model/train_current_model.py:681: negatives = torch.cat([uniform, inbatch], dim=1).numpy()\n/task/current_model/train_current_model.py:682: correction = np.ones_like(negatives, dtype=np.float32)\n/task/current_model/train_current_model.py:685: :, config.uniform_negatives : config.uniform_negatives + corrected_count\n/task/current_model/train_current_model.py:686: ] = item_correction[inbatch[:, :corrected_count]].numpy()\n/task/current_model/train_current_model.py:688: invalid = invalid_full_history_negatives(\n/task/current_model/train_current_model.py:689: negatives,\n/task/current_model/train_current_model.py:697: torch.from_numpy(negatives).to(device),\n/task/current_model/train_current_model.py:706: negatives[invalid] = replacements\n/task/current_model/train_current_model.py:707: # Rejected in-batch items become ordinary uniform draws.\n/task/current_model/train_current_model.py:709: invalid = invalid_full_history_negatives(\n/task/current_model/train_current_model.py:710: negatives,\n/task/current_model/train_current_model.py:717: raise RuntimeError(\"full-history negative resampling failed\")\n/task/current_model/train_current_model.py:719: torch.from_numpy(negatives).to(device),\n/task/current_model/train_current_model.py:724:def draw_training_negatives(\n/task/current_model/train_current_model.py:736: if config.negative_filter_scope == \"full-training-history\":\n/task/current_model/train_current_model.py:738: raise RuntimeError(\"full-history negative filter was not built\")\n/task/current_model/train_current_model.py:739: return draw_full_history_filtered_negatives(\n/task/current_model/train_current_model.py:750: return base.draw_filtered_mixed_negatives(\n/task/current_model/train_current_model.py:755: config.uniform_negatives,\n/task/current_model/train_current_model.py:756: config.inbatch_negatives,\n/task/current_model/train_current_model.py:816: negatives: torch.Tensor,\n/task/current_model/train_current_model.py:818: all_items = torch.cat([positives, negatives.reshape(-1)])\n/task/current_model/train_current_model.py:822: negative_vectors = encoded[inverse[len(positives) :]].reshape(\n/task/current_model/train_current_model.py:823: len(positives), negatives.shape[1], -1\n/task/current_model/train_current_model.py:825: return positive_vectors, negative_vectors\n/task/current_model/train_current_model.py:845:def corrected_negative_loss(\n/task/current_model/train_current_model.py:851: total = config.uniform_negatives + config.inbatch_negatives\n/task/current_model/train_current_model.py:853: if config.uniform_negatives:\n/task/current_model/train_current_model.py:854: result += config.uniform_negatives * raw[\n/task/current_model/train_current_model.py:855: :, : config.uniform_negatives\n/task/current_model/train_current_model.py:857: if config.inbatch_negatives:\n/task/current_model/train_current_model.py:858: selected = slice(config.uniform_negatives, total)\n/task/current_model/train_current_model.py:860: result += config.inbatch_negatives * (\n/task/current_model/train_current_model.py:880: raise RuntimeError(\"chronological target partition produced negative counts\")\n/task/current_model/train_current_model.py:888:def chronological_target_partition(\n/task/current_model/train_current_model.py:963: if config.target_weighting == \"uniform\":\n/task/current_model/train_current_model.py:1119: negatives: torch.Tensor,\n/task/current_model/train_current_model.py:1120: negative_weights: torch.Tensor,\n/task/current_model/train_current_model.py:1121: sample_weights: np.ndarray,\n/task/current_model/train_current_model.py:1127: total_weight = float(sample_weights.sum())\n/task/current_model/train_current_model.py:1129: raise RuntimeError(\"target block has no positive sample weight\")\n/task/current_model/train_current_model.py:1132: \"loss_sum\": 0.0,\n/task/current_model/train_current_model.py:1134: \"negative_sum\": 0.0,\n/task/current_model/train_current_model.py:1138: for begin in range(0, target_count, config.loss_microbatch_size):\n/task/current_model/train_current_model.py:1139: end = min(begin + config.loss_microbatch_size, target_count)\n/task/current_model/train_current_model.py:1162: positive_vectors, negative_vectors = candidate_vectors(\n/task/current_model/train_current_model.py:1165: negatives[begin:end],\n/task/current_model/train_current_model.py:1168: negative_logits = torch.einsum(\n/task/current_model/train_current_model.py:1169: \"bd,bkd->bk\", query_vectors, negative_vectors\n/task/current_model/train_current_model.py:1171: positive_loss = F.softplus(-positive_logits)\n/task/current_model/train_current_model.py:1172: negative_loss = corrected_negative_loss(\n/task/current_model/train_current_model.py:1173: negative_logits, negative_weights[begin:end], config\n/task/current_model/train_current_model.py:1176: sample_weights[begin:end].astype(np.float32, copy=False)\n/task/current_model/train_current_model.py:1178: loss_sum = (\n/task/current_model/train_current_model.py:1179: selected_weights * (positive_loss + negative_loss) / 2.0\n/task/current_model/train_current_model.py:1181: if not bool(torch.isfinite(loss_sum)):\n/task/current_model/train_current_model.py:1182: raise RuntimeError(\"dense next-item training produced non-finite loss\")\n/task/current_model/train_current_model.py:1184: (loss_sum / total_weight).backward()\n/task/current_model/train_current_model.py:1188: statistics[\"loss_sum\"] += float(loss_sum.detach().cpu())\n/task/current_model/train_current_model.py:1190: statistics[\"negative_sum\"] += float(negative_logits.detach().sum().cpu())\n/task/current_model/train_current_model.py:1192: (positive_logits.detach()[:, None] > negative_logits.detach()).sum().cpu()\n/task/current_model/train_current_model.py:1227: negative_count = config.uniform_negatives + config.inbatch_negatives\n/task/current_model/train_current_model.py:1228: total_loss = 0.0\n/task/current_model/train_current_model.py:1232: total_negative = 0.0\n/task/current_model/train_current_model.py:1293: negatives, negative_weights = draw_training_negatives(\n/task/current_model/train_current_model.py:1314: negatives,\n/task/current_model/train_current_model.py:1315: negative_weights,\n/task/current_model/train_current_model.py:1327: total_loss += statistics[\"loss_sum\"]\n/task/current_model/train_current_model.py:1331: total_negative += statistics[\"negative_sum\"]\n/task/current_model/train_current_model.py:1337: batch_bce = statistics[\"loss_sum\"] / max(\n/task/current_model/train_current_model.py:1340: running_bce = total_loss / max(total_weight, 1.0e-12)\n/task/current_model/train_current_model.py:1351: \"loss\": total_loss / max(total_weight, 1.0e-12),\n/task/current_model/train_current_model.py:1353: \"negative_logit\": total_negative / max(total_targets * negative_count, 1),\n/task/current_model/train_current_model.py:1355: / max(total_targets * negative_count, 1),\n/task/current_model/train_current_model.py:1388: total_loss = 0.0\n/task/current_model/train_current_model.py:1449: negatives, negative_weights = draw_training_negatives(\n/task/current_model/train_current_model.py:1469: negatives,\n/task/current_model/train_current_model.py:1470: negative_weights,\n/task/current_model/train_current_model.py:1475: total_loss += statistics[\"loss_sum\"]\n/task/current_model/train_current_model.py:1481: \"validation_loss\": total_loss / max(total_weight, 1.0e-12),\n/task/current_model/train_current_model.py:1521:def train_model(\n/task/current_model/train_current_model.py:1530: partition = chronological_target_partition(\n/task/current_model/train_current_model.py:1536: training_counts = partition.training_counts\n/task/current_model/train_current_model.py:1537: validation_counts = partition.validation_counts\n/task/current_model/train_current_model.py:1541: f\"selected={partition.selected_count:,} \"\n/task/current_model/train_current_model.py:1542: f\"discarded_old_targets={int(partition.window_starts.sum()):,} \"\n/task/current_model/train_current_model.py:1555: partition.window_starts,\n/task/current_model/train_current_model.py:1562: partition.history_training_counts,\n/task/current_model/train_current_model.py:1566: build_known_positive_filter(prepared, partition.history_training_counts)\n/task/current_model/train_current_model.py:1567: if config.negative_filter_scope == \"full-training-history\"\n/task/current_model/train_current_model.py:1571: best_loss = float(\"inf\")\n/task/current_model/train_current_model.py:1601: \"negative_filter_scope\", \"last-100\"\n/task/current_model/train_current_model.py:1604: \"target_weighting\", \"uniform\"\n/task/current_model/train_current_model.py:1629: stored_filter_scope != config.negative_filter_scope\n/task/current_model/train_current_model.py:1657: prior.pop(\"validation_loss\", None)\n/task/current_model/train_current_model.py:1660: f\"{stored_filter_scope}->{config.negative_filter_scope}, \"\n/task/current_model/train_current_model.py:1666: if \"validation_loss\" not in prior:\n/task/current_model/train_current_model.py:1673: partition.window_starts,\n/task/current_model/train_current_model.py:1682: best_loss = float(prior[\"validation_loss\"])\n/task/current_model/train_current_model.py:1687: f\"loss={best_loss:.6f}\"\n/task/current_model/train_current_model.py:1697: partition.window_starts,\n/task/current_model/train_current_model.py:1710: partition.window_starts,\n/task/current_model/train_current_model.py:1731: diagnostics[\"validation_loss\"]\n/task/current_model/train_current_model.py:1732: < best_loss - config.early_stopping_min_delta\n/task/current_model/train_current_model.py:1735: best_loss = diagnostics[\"validation_loss\"]\n/task/current_model/train_current_model.py:1754: f\"epoch={epoch}/{config.epochs} train_loss={diagnostics['loss']:.5f} \"\n/task/current_model/train_current_model.py:1755: f\"validation_loss={diagnostics['validation_loss']:.5f} \"\n/task/current_model/train_current_model.py:1766: f\"best_epoch={best_epoch} best_validation_loss={best_loss:.6f}\"\n/task/current_model/train_current_model.py:1776: f\"loss={best_loss:.6f}\"\n/task/current_model/train_current_model.py:1861:def rank_candidates(\n/task/current_model/train_current_model.py:1867: ranking_batch_size: int,\n/task/current_model/train_current_model.py:1882: for start in range(0, len(eligibility.uids), ranking_batch_size):\n/task/current_model/train_current_model.py:1883: end = min(start + ranking_batch_size, len(eligibility.uids))\n/task/current_model/train_current_model.py:1896: (uid, int(prepared.item_ids[column]), rank)\n/task/current_model/train_current_model.py:1897: for rank, column in enumerate(columns, start=1)\n/task/current_model/train_current_model.py:1900: log(f\"ranked users={end:,}/{len(eligibility.uids):,}\")\n/task/current_model/train_current_model.py:1909: return pd.DataFrame(rows, columns=[\"uid\", \"item_id\", \"rank\"]), diagnostics\n/task/current_model/train_current_model.py:1912:def write_ranking(frame: pd.DataFrame, output: Path) -> None:\n/task/current_model/train_current_model.py:1922:def main() -> int:\n/task/current_model/train_current_model.py:1923: parser = argparse.ArgumentParser(description=__doc__)\n/task/current_model/train_current_model.py:1939: \"--loss-microbatch-size\",\n/task/current_model/train_current_model.py:1941: default=Config.loss_microbatch_size,\n/task/current_model/train_current_model.py:1944: \"--negative-filter-scope\",\n/task/current_model/train_current_model.py:1946: default=Config.negative_filter_scope,\n/task/current_model/train_current_model.py:1950: choices=(\"discovery-graded\", \"organic-strong\", \"uniform\"),\n/task/current_model/train_current_model.py:2003: parser.add_argument(\"--ranking-batch-size\", type=int, default=64)\n/task/current_model/train_current_model.py:2012: or args.loss_microbatch_size < 1\n/task/current_model/train_current_model.py:2033: loss_microbatch_size=args.loss_microbatch_size,\n/task/current_model/train_current_model.py:2034: negative_filter_scope=args.negative_filter_scope,\n/task/current_model/train_current_model.py:2061: target_partition = chronological_target_partition(\n/task/current_model/train_current_model.py:2076: target_partition.training_counts.sum()\n/task/current_model/train_current_model.py:2079: target_partition.validation_counts.sum()\n/task/current_model/train_current_model.py:2082: target_partition.window_starts.sum()\n/task/current_model/train_current_model.py:2093: model, training_history = train_model(\n/task/current_model/train_current_model.py:2102: ranking, embedding_diagnostics = rank_candidates(\n/task/current_model/train_current_model.py:2108: args.ranking_batch_size,\n/task/current_model/train_current_model.py:2110: write_ranking(ranking, args.output.resolve())\n/task/current_model/train_current_model.py:2117: \"rows\": len(ranking),\n/task/current_model/train_current_model.py:2118: \"users\": int(ranking.uid.nunique()),\n/task/current_model/train_current_model.py:2126: \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n/task/current_model/train_current_model.py:2129: \"loss_execution\": \"gradient-accumulated-microbatches\",\n/task/current_model/train_current_model.py:2135: \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n/task/current_model/train_current_model.py:2136: \"negative_sampling\": (\n/task/current_model/train_current_model.py:2137: \"24-uniform-plus-8-propensity-corrected-inbatch\"\n/task/current_model/train_current_model.py:2139: \"false_negative_filter\": config.negative_filter_scope,\n/task/current_model/train_current_model.py:2146: target_partition.training_counts.sum()\n/task/current_model/train_current_model.py:2149: target_partition.validation_counts.sum()\n/task/current_model/train_current_model.py:2151: \"discarded_old_targets\": int(target_partition.window_starts.sum()),\n", "exit_code": 0, "duration": { "secs": 0, "nanos": 4321 }, "formatted_output": "/task/current_model/two_tower_model.py:40: uniform_negatives: int = 24\n/task/current_model/two_tower_model.py:41: inbatch_negatives: int = 8\n/task/current_model/two_tower_model.py:42: inbatch_correction_power: float = 0.5\n/task/current_model/two_tower_model.py:43: inbatch_correction_min: float = 0.25\n/task/current_model/two_tower_model.py:44: inbatch_correction_max: float = 4.0\n/task/current_model/two_tower_model.py:73: popularity_rank = catalog.popularity_rank.to_numpy(dtype=np.float64, copy=False)\n/task/current_model/two_tower_model.py:79: 1.0 - (popularity_rank - 1.0) / max(len(catalog) - 1, 1),\n/task/current_model/two_tower_model.py:346:def invalid_negative_mask(\n/task/current_model/two_tower_model.py:347: negatives: torch.Tensor,\n/task/current_model/two_tower_model.py:353: invalid = negatives.eq(targets[:, None])\n/task/current_model/two_tower_model.py:354: invalid |= negatives[:, :, None].eq(context_items[:, None, :]).any(dim=2)\n/task/current_model/two_tower_model.py:355: invalid |= negatives[:, :, None].eq(liked_items[:, None, :]).any(dim=2)\n/task/current_model/two_tower_model.py:356: for column in range(1, negatives.shape[1]):\n/task/current_model/two_tower_model.py:357: invalid[:, column] |= negatives[:, column, None].eq(\n/task/current_model/two_tower_model.py:358: negatives[:, :column]\n/task/current_model/two_tower_model.py:363:def draw_filtered_mixed_negatives(\n/task/current_model/two_tower_model.py:368: uniform_count: int,\n/task/current_model/two_tower_model.py:369: inbatch_count: int,\n/task/current_model/two_tower_model.py:374: \"\"\"Draw uniform and unique-target in-batch negatives.\"\"\"\n/task/current_model/two_tower_model.py:376: uniform = torch.randint(\n/task/current_model/two_tower_model.py:378: (batch_size, uniform_count),\n/task/current_model/two_tower_model.py:382: inbatch = torch.empty((batch_size, 0), dtype=torch.long, device=\"cpu\")\n/task/current_model/two_tower_model.py:384: if inbatch_count:\n/task/current_model/two_tower_model.py:386: corrected_count = min(inbatch_count, max(len(unique_targets) - 1, 0))\n/task/current_model/two_tower_model.py:396: inbatch = unique_targets[columns]\n/task/current_model/two_tower_model.py:397: if corrected_count < inbatch_count:\n/task/current_model/two_tower_model.py:400: (batch_size, inbatch_count - corrected_count),\n/task/current_model/two_tower_model.py:404: inbatch = torch.cat([inbatch, filler], dim=1)\n/task/current_model/two_tower_model.py:406: negatives_cpu = torch.cat([uniform, inbatch], dim=1)\n/task/current_model/two_tower_model.py:407: correction_cpu = torch.ones_like(negatives_cpu, dtype=torch.float32)\n/task/current_model/two_tower_model.py:410: :, uniform_count : uniform_count + corrected_count\n/task/current_model/two_tower_model.py:411: ] = item_correction[inbatch[:, :corrected_count]]\n/task/current_model/two_tower_model.py:412: negatives = negatives_cpu.to(device)\n/task/current_model/two_tower_model.py:415: invalid = invalid_negative_mask(\n/task/current_model/two_tower_model.py:416: negatives, targets, context_items, liked_items\n/task/current_model/two_tower_model.py:419: return negatives, correction\n/task/current_model/two_tower_model.py:426: negatives[invalid] = replacements\n/task/current_model/two_tower_model.py:428: invalid = invalid_negative_mask(\n/task/current_model/two_tower_model.py:429: negatives, targets, context_items, liked_items\n/task/current_model/two_tower_model.py:432: raise RuntimeError(\"mixed negative resampling failed false-negative filter\")\n/task/current_model/two_tower_model.py:433: return negatives, correction\n/task/current_model/train_current_model.py:6:loss. The fast default retains each user's most recent 128 training targets and\n/task/current_model/train_current_model.py:9:computes all of its timestep losses and carries the detached GRU hidden state\n/task/current_model/train_current_model.py:13:normalization, raw dot-product retrieval, sample-weighted binary cross entropy,\n/task/current_model/train_current_model.py:14:and 24 uniform plus eight propensity-corrected unique in-batch negatives. Every\n/task/current_model/train_current_model.py:55: loss_microbatch_size: int = 65_536\n/task/current_model/train_current_model.py:56: uniform_negatives: int = 24\n/task/current_model/train_current_model.py:57: inbatch_negatives: int = 8\n/task/current_model/train_current_model.py:58: inbatch_correction_power: float = 0.5\n/task/current_model/train_current_model.py:59: inbatch_correction_min: float = 0.25\n/task/current_model/train_current_model.py:60: inbatch_correction_max: float = 4.0\n/task/current_model/train_current_model.py:61: negative_filter_scope: str = \"full-training-history\"\n/task/current_model/train_current_model.py:165: uniform_negatives=config.uniform_negatives,\n/task/current_model/train_current_model.py:166: inbatch_negatives=config.inbatch_negatives,\n/task/current_model/train_current_model.py:167: inbatch_correction_power=config.inbatch_correction_power,\n/task/current_model/train_current_model.py:168: inbatch_correction_min=config.inbatch_correction_min,\n/task/current_model/train_current_model.py:169: inbatch_correction_max=config.inbatch_correction_max,\n/task/current_model/train_current_model.py:346: \"popularity_rank\"\n/task/current_model/train_current_model.py:477: \"event_time_feature\": \"exp-negative-gap-over-60-days\",\n/task/current_model/train_current_model.py:562: config.inbatch_correction_power,\n/task/current_model/train_current_model.py:567: config.inbatch_correction_min,\n/task/current_model/train_current_model.py:568: config.inbatch_correction_max,\n/task/current_model/train_current_model.py:572: f\"inbatch correction: min={correction.min():.3f} \"\n/task/current_model/train_current_model.py:603: f\"full-history false-negative filter: users={len(prepared.user_ids):,} \"\n/task/current_model/train_current_model.py:609:def invalid_full_history_negatives(\n/task/current_model/train_current_model.py:610: negatives: np.ndarray,\n/task/current_model/train_current_model.py:616: \"\"\"Return row-level invalid negatives using the complete training prefix.\"\"\"\n/task/current_model/train_current_model.py:617: byte_columns = negatives >> 3\n/task/current_model/train_current_model.py:618: bit_columns = negatives & 7\n/task/current_model/train_current_model.py:621: invalid |= negatives == targets[:, None]\n/task/current_model/train_current_model.py:622: invalid |= (negatives[:, :, None] == liked_items[:, None, :]).any(axis=2)\n/task/current_model/train_current_model.py:623: for column in range(1, negatives.shape[1]):\n/task/current_model/train_current_model.py:625: negatives[:, column, None] == negatives[:, :column]\n/task/current_model/train_current_model.py:630:def draw_full_history_filtered_negatives(\n/task/current_model/train_current_model.py:641: \"\"\"Draw mixed negatives and reject all known public-training positives.\"\"\"\n/task/current_model/train_current_model.py:645: uniform = torch.randint(\n/task/current_model/train_current_model.py:647: (batch_size, config.uniform_negatives),\n/task/current_model/train_current_model.py:651: inbatch = torch.empty((batch_size, 0), dtype=torch.long)\n/task/current_model/train_current_model.py:653: if config.inbatch_negatives:\n/task/current_model/train_current_model.py:656: config.inbatch_negatives, max(len(unique_targets) - 1, 0)\n/task/current_model/train_current_model.py:671: inbatch = unique_targets[columns]\n/task/current_model/train_current_model.py:672: if corrected_count < config.inbatch_negatives:\n/task/current_model/train_current_model.py:675: (batch_size, config.inbatch_negatives - corrected_count),\n/task/current_model/train_current_model.py:679: inbatch = torch.cat([inbatch, filler], dim=1)\n/task/current_model/train_current_model.py:681: negatives = torch.cat([uniform, inbatch], dim=1).numpy()\n/task/current_model/train_current_model.py:682: correction = np.ones_like(negatives, dtype=np.float32)\n/task/current_model/train_current_model.py:685: :, config.uniform_negatives : config.uniform_negatives + corrected_count\n/task/current_model/train_current_model.py:686: ] = item_correction[inbatch[:, :corrected_count]].numpy()\n/task/current_model/train_current_model.py:688: invalid = invalid_full_history_negatives(\n/task/current_model/train_current_model.py:689: negatives,\n/task/current_model/train_current_model.py:697: torch.from_numpy(negatives).to(device),\n/task/current_model/train_current_model.py:706: negatives[invalid] = replacements\n/task/current_model/train_current_model.py:707: # Rejected in-batch items become ordinary uniform draws.\n/task/current_model/train_current_model.py:709: invalid = invalid_full_history_negatives(\n/task/current_model/train_current_model.py:710: negatives,\n/task/current_model/train_current_model.py:717: raise RuntimeError(\"full-history negative resampling failed\")\n/task/current_model/train_current_model.py:719: torch.from_numpy(negatives).to(device),\n/task/current_model/train_current_model.py:724:def draw_training_negatives(\n/task/current_model/train_current_model.py:736: if config.negative_filter_scope == \"full-training-history\":\n/task/current_model/train_current_model.py:738: raise RuntimeError(\"full-history negative filter was not built\")\n/task/current_model/train_current_model.py:739: return draw_full_history_filtered_negatives(\n/task/current_model/train_current_model.py:750: return base.draw_filtered_mixed_negatives(\n/task/current_model/train_current_model.py:755: config.uniform_negatives,\n/task/current_model/train_current_model.py:756: config.inbatch_negatives,\n/task/current_model/train_current_model.py:816: negatives: torch.Tensor,\n/task/current_model/train_current_model.py:818: all_items = torch.cat([positives, negatives.reshape(-1)])\n/task/current_model/train_current_model.py:822: negative_vectors = encoded[inverse[len(positives) :]].reshape(\n/task/current_model/train_current_model.py:823: len(positives), negatives.shape[1], -1\n/task/current_model/train_current_model.py:825: return positive_vectors, negative_vectors\n/task/current_model/train_current_model.py:845:def corrected_negative_loss(\n/task/current_model/train_current_model.py:851: total = config.uniform_negatives + config.inbatch_negatives\n/task/current_model/train_current_model.py:853: if config.uniform_negatives:\n/task/current_model/train_current_model.py:854: result += config.uniform_negatives * raw[\n/task/current_model/train_current_model.py:855: :, : config.uniform_negatives\n/task/current_model/train_current_model.py:857: if config.inbatch_negatives:\n/task/current_model/train_current_model.py:858: selected = slice(config.uniform_negatives, total)\n/task/current_model/train_current_model.py:860: result += config.inbatch_negatives * (\n/task/current_model/train_current_model.py:880: raise RuntimeError(\"chronological target partition produced negative counts\")\n/task/current_model/train_current_model.py:888:def chronological_target_partition(\n/task/current_model/train_current_model.py:963: if config.target_weighting == \"uniform\":\n/task/current_model/train_current_model.py:1119: negatives: torch.Tensor,\n/task/current_model/train_current_model.py:1120: negative_weights: torch.Tensor,\n/task/current_model/train_current_model.py:1121: sample_weights: np.ndarray,\n/task/current_model/train_current_model.py:1127: total_weight = float(sample_weights.sum())\n/task/current_model/train_current_model.py:1129: raise RuntimeError(\"target block has no positive sample weight\")\n/task/current_model/train_current_model.py:1132: \"loss_sum\": 0.0,\n/task/current_model/train_current_model.py:1134: \"negative_sum\": 0.0,\n/task/current_model/train_current_model.py:1138: for begin in range(0, target_count, config.loss_microbatch_size):\n/task/current_model/train_current_model.py:1139: end = min(begin + config.loss_microbatch_size, target_count)\n/task/current_model/train_current_model.py:1162: positive_vectors, negative_vectors = candidate_vectors(\n/task/current_model/train_current_model.py:1165: negatives[begin:end],\n/task/current_model/train_current_model.py:1168: negative_logits = torch.einsum(\n/task/current_model/train_current_model.py:1169: \"bd,bkd->bk\", query_vectors, negative_vectors\n/task/current_model/train_current_model.py:1171: positive_loss = F.softplus(-positive_logits)\n/task/current_model/train_current_model.py:1172: negative_loss = corrected_negative_loss(\n/task/current_model/train_current_model.py:1173: negative_logits, negative_weights[begin:end], config\n/task/current_model/train_current_model.py:1176: sample_weights[begin:end].astype(np.float32, copy=False)\n/task/current_model/train_current_model.py:1178: loss_sum = (\n/task/current_model/train_current_model.py:1179: selected_weights * (positive_loss + negative_loss) / 2.0\n/task/current_model/train_current_model.py:1181: if not bool(torch.isfinite(loss_sum)):\n/task/current_model/train_current_model.py:1182: raise RuntimeError(\"dense next-item training produced non-finite loss\")\n/task/current_model/train_current_model.py:1184: (loss_sum / total_weight).backward()\n/task/current_model/train_current_model.py:1188: statistics[\"loss_sum\"] += float(loss_sum.detach().cpu())\n/task/current_model/train_current_model.py:1190: statistics[\"negative_sum\"] += float(negative_logits.detach().sum().cpu())\n/task/current_model/train_current_model.py:1192: (positive_logits.detach()[:, None] > negative_logits.detach()).sum().cpu()\n/task/current_model/train_current_model.py:1227: negative_count = config.uniform_negatives + config.inbatch_negatives\n/task/current_model/train_current_model.py:1228: total_loss = 0.0\n/task/current_model/train_current_model.py:1232: total_negative = 0.0\n/task/current_model/train_current_model.py:1293: negatives, negative_weights = draw_training_negatives(\n/task/current_model/train_current_model.py:1314: negatives,\n/task/current_model/train_current_model.py:1315: negative_weights,\n/task/current_model/train_current_model.py:1327: total_loss += statistics[\"loss_sum\"]\n/task/current_model/train_current_model.py:1331: total_negative += statistics[\"negative_sum\"]\n/task/current_model/train_current_model.py:1337: batch_bce = statistics[\"loss_sum\"] / max(\n/task/current_model/train_current_model.py:1340: running_bce = total_loss / max(total_weight, 1.0e-12)\n/task/current_model/train_current_model.py:1351: \"loss\": total_loss / max(total_weight, 1.0e-12),\n/task/current_model/train_current_model.py:1353: \"negative_logit\": total_negative / max(total_targets * negative_count, 1),\n/task/current_model/train_current_model.py:1355: / max(total_targets * negative_count, 1),\n/task/current_model/train_current_model.py:1388: total_loss = 0.0\n/task/current_model/train_current_model.py:1449: negatives, negative_weights = draw_training_negatives(\n/task/current_model/train_current_model.py:1469: negatives,\n/task/current_model/train_current_model.py:1470: negative_weights,\n/task/current_model/train_current_model.py:1475: total_loss += statistics[\"loss_sum\"]\n/task/current_model/train_current_model.py:1481: \"validation_loss\": total_loss / max(total_weight, 1.0e-12),\n/task/current_model/train_current_model.py:1521:def train_model(\n/task/current_model/train_current_model.py:1530: partition = chronological_target_partition(\n/task/current_model/train_current_model.py:1536: training_counts = partition.training_counts\n/task/current_model/train_current_model.py:1537: validation_counts = partition.validation_counts\n/task/current_model/train_current_model.py:1541: f\"selected={partition.selected_count:,} \"\n/task/current_model/train_current_model.py:1542: f\"discarded_old_targets={int(partition.window_starts.sum()):,} \"\n/task/current_model/train_current_model.py:1555: partition.window_starts,\n/task/current_model/train_current_model.py:1562: partition.history_training_counts,\n/task/current_model/train_current_model.py:1566: build_known_positive_filter(prepared, partition.history_training_counts)\n/task/current_model/train_current_model.py:1567: if config.negative_filter_scope == \"full-training-history\"\n/task/current_model/train_current_model.py:1571: best_loss = float(\"inf\")\n/task/current_model/train_current_model.py:1601: \"negative_filter_scope\", \"last-100\"\n/task/current_model/train_current_model.py:1604: \"target_weighting\", \"uniform\"\n/task/current_model/train_current_model.py:1629: stored_filter_scope != config.negative_filter_scope\n/task/current_model/train_current_model.py:1657: prior.pop(\"validation_loss\", None)\n/task/current_model/train_current_model.py:1660: f\"{stored_filter_scope}->{config.negative_filter_scope}, \"\n/task/current_model/train_current_model.py:1666: if \"validation_loss\" not in prior:\n/task/current_model/train_current_model.py:1673: partition.window_starts,\n/task/current_model/train_current_model.py:1682: best_loss = float(prior[\"validation_loss\"])\n/task/current_model/train_current_model.py:1687: f\"loss={best_loss:.6f}\"\n/task/current_model/train_current_model.py:1697: partition.window_starts,\n/task/current_model/train_current_model.py:1710: partition.window_starts,\n/task/current_model/train_current_model.py:1731: diagnostics[\"validation_loss\"]\n/task/current_model/train_current_model.py:1732: < best_loss - config.early_stopping_min_delta\n/task/current_model/train_current_model.py:1735: best_loss = diagnostics[\"validation_loss\"]\n/task/current_model/train_current_model.py:1754: f\"epoch={epoch}/{config.epochs} train_loss={diagnostics['loss']:.5f} \"\n/task/current_model/train_current_model.py:1755: f\"validation_loss={diagnostics['validation_loss']:.5f} \"\n/task/current_model/train_current_model.py:1766: f\"best_epoch={best_epoch} best_validation_loss={best_loss:.6f}\"\n/task/current_model/train_current_model.py:1776: f\"loss={best_loss:.6f}\"\n/task/current_model/train_current_model.py:1861:def rank_candidates(\n/task/current_model/train_current_model.py:1867: ranking_batch_size: int,\n/task/current_model/train_current_model.py:1882: for start in range(0, len(eligibility.uids), ranking_batch_size):\n/task/current_model/train_current_model.py:1883: end = min(start + ranking_batch_size, len(eligibility.uids))\n/task/current_model/train_current_model.py:1896: (uid, int(prepared.item_ids[column]), rank)\n/task/current_model/train_current_model.py:1897: for rank, column in enumerate(columns, start=1)\n/task/current_model/train_current_model.py:1900: log(f\"ranked users={end:,}/{len(eligibility.uids):,}\")\n/task/current_model/train_current_model.py:1909: return pd.DataFrame(rows, columns=[\"uid\", \"item_id\", \"rank\"]), diagnostics\n/task/current_model/train_current_model.py:1912:def write_ranking(frame: pd.DataFrame, output: Path) -> None:\n/task/current_model/train_current_model.py:1922:def main() -> int:\n/task/current_model/train_current_model.py:1923: parser = argparse.ArgumentParser(description=__doc__)\n/task/current_model/train_current_model.py:1939: \"--loss-microbatch-size\",\n/task/current_model/train_current_model.py:1941: default=Config.loss_microbatch_size,\n/task/current_model/train_current_model.py:1944: \"--negative-filter-scope\",\n/task/current_model/train_current_model.py:1946: default=Config.negative_filter_scope,\n/task/current_model/train_current_model.py:1950: choices=(\"discovery-graded\", \"organic-strong\", \"uniform\"),\n/task/current_model/train_current_model.py:2003: parser.add_argument(\"--ranking-batch-size\", type=int, default=64)\n/task/current_model/train_current_model.py:2012: or args.loss_microbatch_size < 1\n/task/current_model/train_current_model.py:2033: loss_microbatch_size=args.loss_microbatch_size,\n/task/current_model/train_current_model.py:2034: negative_filter_scope=args.negative_filter_scope,\n/task/current_model/train_current_model.py:2061: target_partition = chronological_target_partition(\n/task/current_model/train_current_model.py:2076: target_partition.training_counts.sum()\n/task/current_model/train_current_model.py:2079: target_partition.validation_counts.sum()\n/task/current_model/train_current_model.py:2082: target_partition.window_starts.sum()\n/task/current_model/train_current_model.py:2093: model, training_history = train_model(\n/task/current_model/train_current_model.py:2102: ranking, embedding_diagnostics = rank_candidates(\n/task/current_model/train_current_model.py:2108: args.ranking_batch_size,\n/task/current_model/train_current_model.py:2110: write_ranking(ranking, args.output.resolve())\n/task/current_model/train_current_model.py:2117: \"rows\": len(ranking),\n/task/current_model/train_current_model.py:2118: \"users\": int(ranking.uid.nunique()),\n/task/current_model/train_current_model.py:2126: \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n/task/current_model/train_current_model.py:2129: \"loss_execution\": \"gradient-accumulated-microbatches\",\n/task/current_model/train_current_model.py:2135: \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n/task/current_model/train_current_model.py:2136: \"negative_sampling\": (\n/task/current_model/train_current_model.py:2137: \"24-uniform-plus-8-propensity-corrected-inbatch\"\n/task/current_model/train_current_model.py:2139: \"false_negative_filter\": config.negative_filter_scope,\n/task/current_model/train_current_model.py:2146: target_partition.training_counts.sum()\n/task/current_model/train_current_model.py:2149: target_partition.validation_counts.sum()\n/task/current_model/train_current_model.py:2151: \"discarded_old_targets\": int(target_partition.window_starts.sum()),\n" } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab4475d215c87d2b83452987630e4df", "usage": { "input_tokens": 21008, "cached_input_tokens": 14720, "cache_write_input_tokens": 0, "output_tokens": 120, "reasoning_output_tokens": 27, "total_tokens": 21128 }, "turn_token_usage": { "input_tokens": 35908, "cached_input_tokens": 25856, "cache_write_input_tokens": 0, "output_tokens": 321, "reasoning_output_tokens": 47, "total_tokens": 36229 }, "thread_token_usage": { "input_tokens": 35908, "cached_input_tokens": 25856, "cache_write_input_tokens": 0, "output_tokens": 321, "reasoning_output_tokens": 47, "total_tokens": 36229 } } ## Step 9 · agent · 2026-09-23T21:40:52.465Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:40:56.193Z { "code": "const r = await tools.exec_command({cmd:\"mkdir -p /app/solution && cp /task/current_model/train_current_model.py /app/solution/train_current_model.py && cp /task/current_model/two_tower_model.py /app/solution/two_tower_model.py && python /app/solution/train_current_model.py --stage validation --public-dir /task --output /app/solution/production_validation.parquet\",\"workdir\":\"/app/solution\",\"yield_time_ms\":1000,\"max_output_tokens\":12000}); text(JSON.stringify(r))\n" } ### Tool output · 2026-09-23T21:40:56.408Z Script completed Wall time 0.2 seconds Output: {"chunk_id":"5dc225","wall_time_seconds":0.047200788,"exit_code":1,"original_token_count":43,"output":"Traceback (most recent call last):\n File \"/app/solution/train_current_model.py\", line 28, in \n import numpy as np\nModuleNotFoundError: No module named 'numpy'\n"} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44762940c87d28ceccb7e0b53507a", "usage": { "input_tokens": 26387, "cached_input_tokens": 11136, "cache_write_input_tokens": 0, "output_tokens": 156, "reasoning_output_tokens": 30, "total_tokens": 26543 }, "turn_token_usage": { "input_tokens": 62295, "cached_input_tokens": 36992, "cache_write_input_tokens": 0, "output_tokens": 477, "reasoning_output_tokens": 77, "total_tokens": 62772 }, "thread_token_usage": { "input_tokens": 62295, "cached_input_tokens": 36992, "cache_write_input_tokens": 0, "output_tokens": 477, "reasoning_output_tokens": 77, "total_tokens": 62772 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-b448b3d9-0711-496a-b63b-11fae47c5a1c", "process_id": "65018", "command": [ "/bin/sh", "-lc", "mkdir -p /app/solution && cp /task/current_model/train_current_model.py /app/solution/train_current_model.py && cp /task/current_model/two_tower_model.py /app/solution/two_tower_model.py && python /app/solution/train_current_model.py --stage validation --public-dir /task --output /app/solution/production_validation.parquet" ], "cwd": "file:///app/solution", "parsed_cmd": [ { "type": "unknown", "cmd": "mkdir -p /app/solution && cp /task/current_model/train_current_model.py /app/solution/train_current_model.py && cp /task/current_model/two_tower_model.py /app/solution/two_tower_model.py && python /app/solution/train_current_model.py --stage validation --public-dir /task --output /app/solution/production_validation.parquet" } ], "source": "unified_exec_startup", "status": "failed", "stdout": "Traceback (most recent call last):\n File \"/app/solution/train_current_model.py\", line 28, in \n import numpy as np\nModuleNotFoundError: No module named 'numpy'\n", "stderr": "", "aggregated_output": "Traceback (most recent call last):\n File \"/app/solution/train_current_model.py\", line 28, in \n import numpy as np\nModuleNotFoundError: No module named 'numpy'\n", "exit_code": 1, "duration": { "secs": 0, "nanos": 47188398 }, "formatted_output": "Traceback (most recent call last):\n File \"/app/solution/train_current_model.py\", line 28, in \n import numpy as np\nModuleNotFoundError: No module named 'numpy'\n" } } ## Step 10 · agent · 2026-09-23T21:40:58.928Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:41:02.904Z { "code": "const r = await tools.exec_command({cmd:\"which -a python python3; python -V; python3 -c 'import sys; print(sys.executable); print(sys.path)' ; sed -n '1920,2165p' /app/solution/train_current_model.py; sed -n '330,455p' /app/solution/two_tower_model.py; sed -n '540,880p' /app/solution/train_current_model.py\",\"workdir\":\"/app\",\"yield_time_ms\":10000,\"max_output_tokens\":30000}); text(r.output)\n" } ### Tool output · 2026-09-23T21:41:02.974Z Script completed Wall time 0.1 seconds Output: /usr/local/bin/python /usr/local/bin/python3 Python 3.12.13 /usr/local/bin/python3 ['', '/usr/local/lib/python312.zip', '/usr/local/lib/python3.12', '/usr/local/lib/python3.12/lib-dynload', '/usr/local/lib/python3.12/site-packages'] def main() -> int: parser = argparse.ArgumentParser(description=__doc__) parser.add_argument( "--stage", choices=("validation", "submission"), default="validation" ) parser.add_argument("--output", type=Path, required=True) parser.add_argument("--public-dir", type=Path, required=True) parser.add_argument("--prepared-cache", type=Path) parser.add_argument("--device", choices=("cpu", "mps"), default="cpu") parser.add_argument("--threads", type=int, default=8) parser.add_argument("--bptt-steps", type=int, default=Config.bptt_steps) parser.add_argument( "--user-batch-size", type=int, default=Config.user_batch_size ) parser.add_argument("--epochs", type=int, default=Config.epochs) parser.add_argument("--learning-rate", type=float, default=Config.learning_rate) parser.add_argument( "--loss-microbatch-size", type=int, default=Config.loss_microbatch_size, ) parser.add_argument( "--negative-filter-scope", choices=("full-training-history", "last-100"), default=Config.negative_filter_scope, ) parser.add_argument( "--target-weighting", choices=("discovery-graded", "organic-strong", "uniform"), default=Config.target_weighting, ) parser.add_argument( "--ordinary-target-weight", type=float, default=Config.ordinary_target_weight, ) parser.add_argument( "--organic-strong-target-weight", type=float, default=Config.organic_strong_target_weight, ) parser.add_argument( "--organic-like-target-weight", type=float, default=Config.organic_like_target_weight, ) parser.add_argument( "--discovery-horizon-days", type=int, default=Config.discovery_horizon_days, ) parser.add_argument( "--validation-fraction", type=float, default=Config.validation_fraction, ) parser.add_argument( "--max-train-targets-per-user", type=int, default=Config.max_train_targets_per_user, help="retain this many recent pre-validation targets per user; 0 is uncapped", ) parser.add_argument( "--max-validation-targets-per-user", type=int, default=Config.max_validation_targets_per_user, help="retain this many final validation targets per user; 0 is uncapped", ) parser.add_argument( "--early-stopping-patience", type=int, default=Config.early_stopping_patience, ) parser.add_argument( "--early-stopping-min-delta", type=float, default=Config.early_stopping_min_delta, ) parser.add_argument("--checkpoint-dir", type=Path) parser.add_argument("--resume-checkpoint", type=Path) parser.add_argument("--seed", type=int, default=Config.seed) parser.add_argument("--ranking-batch-size", type=int, default=64) parser.add_argument("--prepare-only", action="store_true") args = parser.parse_args() if args.threads < 1 or args.bptt_steps < 2 or args.user_batch_size < 1: parser.error("threads, BPTT steps, and user batch size must be positive") if ( args.epochs < 1 or args.learning_rate <= 0 or args.loss_microbatch_size < 1 or args.early_stopping_patience < 1 or args.early_stopping_min_delta < 0 or args.ordinary_target_weight <= 0 or args.organic_strong_target_weight <= 0 or args.organic_like_target_weight <= 0 or args.discovery_horizon_days < 1 or args.max_train_targets_per_user < 0 or args.max_validation_targets_per_user < 0 ): parser.error("training counts, learning rate, and patience are invalid") if not 0.0 < args.validation_fraction < 1.0: parser.error("validation fraction must be strictly between zero and one") public = args.public_dir.resolve() if not (public / "data" / "candidate_catalog.parquet").is_file(): parser.error(f"public task data not found under {public}") config = Config( bptt_steps=args.bptt_steps, user_batch_size=args.user_batch_size, epochs=args.epochs, learning_rate=args.learning_rate, loss_microbatch_size=args.loss_microbatch_size, negative_filter_scope=args.negative_filter_scope, target_weighting=args.target_weighting, ordinary_target_weight=args.ordinary_target_weight, organic_strong_target_weight=args.organic_strong_target_weight, organic_like_target_weight=args.organic_like_target_weight, discovery_horizon_days=args.discovery_horizon_days, validation_fraction=args.validation_fraction, max_train_targets_per_user=args.max_train_targets_per_user, max_validation_targets_per_user=args.max_validation_targets_per_user, early_stopping_patience=args.early_stopping_patience, early_stopping_min_delta=args.early_stopping_min_delta, seed=args.seed, ) torch.set_num_threads(args.threads) torch.set_num_interop_threads(1) seed_everything(config.seed) device = torch.device(args.device) if device.type == "mps" and not torch.backends.mps.is_available(): parser.error("MPS was requested but is unavailable") started = time.monotonic() prepared, eligibility = load_or_prepare( public, args.stage, config, args.prepared_cache.resolve() if args.prepared_cache else None, ) target_partition = chronological_target_partition( prepared, config.validation_fraction, config.max_train_targets_per_user, config.max_validation_targets_per_user, ) if args.prepare_only: print( json.dumps( { "stage": args.stage, "sequence_users": len(prepared.user_ids), "sequence_tokens": len(prepared.sequence_items), "next_item_targets": prepared.target_count, "selected_training_targets": int( target_partition.training_counts.sum() ), "selected_validation_targets": int( target_partition.validation_counts.sum() ), "discarded_old_targets": int( target_partition.window_starts.sum() ), "target_users": len(eligibility.uids), "runtime_seconds": round(time.monotonic() - started, 3), "config": asdict(config), }, indent=2, ) ) return 0 model, training_history = train_model( public, args.stage, prepared, config, device, args.checkpoint_dir.resolve() if args.checkpoint_dir else None, args.resume_checkpoint.resolve() if args.resume_checkpoint else None, ) ranking, embedding_diagnostics = rank_candidates( model, prepared, eligibility, config, device, args.ranking_batch_size, ) write_ranking(ranking, args.output.resolve()) print( json.dumps( { "baseline": "yambda-windowed-sequence-two-tower-base", "stage": args.stage, "output": str(args.output.resolve()), "rows": len(ranking), "users": int(ranking.uid.nunique()), "runtime_seconds": round(time.monotonic() - started, 3), "public_inputs_only": True, "architecture": { "family": "pure-windowed-sequence-two-tower", "sequence_training": ( "every-adjacent-target-within-recent-chronological-window" ), "sequence_encoder": "one-layer-GRU-dense-timestep-loss", "bptt_hidden_state": "carried-and-detached", "model_selection": "chronological-validation-BCE-early-stopping", "loss_execution": "gradient-accumulated-microbatches", "user_id_embedding": False, "user_mlp": "582-512-256-192", "item_mlp": "196-512-256-192", "normalization": "none", "score": "raw-dot-product", "objective": "sample-weighted-BCE-at-every-timestep", "negative_sampling": ( "24-uniform-plus-8-propensity-corrected-inbatch" ), "false_negative_filter": config.negative_filter_scope, "target_weighting": config.target_weighting, }, "config": asdict(config), "sequence_tokens": len(prepared.sequence_items), "all_next_item_targets": prepared.target_count, "selected_training_targets": int( target_partition.training_counts.sum() ), "selected_validation_targets": int( target_partition.validation_counts.sum() ), "discarded_old_targets": int(target_partition.window_starts.sum()), "training_history": training_history, "embedding_diagnostics": embedding_diagnostics, "torch_version": torch.__version__, "device": str(device), }, indent=2, ) ) return 0 if __name__ == "__main__": raise SystemExit(main()) self.context_embedding.weight[n_items].zero_() def _mean_context_channel(self, items: torch.Tensor) -> torch.Tensor: mask = items.ne(self.n_items) vectors = self.context_embedding(items) return (vectors * mask.unsqueeze(-1)).sum(dim=1) / mask.sum( dim=1, keepdim=True ).clamp_min(1) def encode_items(self, items: torch.Tensor) -> torch.Tensor: inputs = torch.cat( [self.candidate_embedding(items), self.item_features[items]], dim=1 ) return self.item_tower(inputs) def invalid_negative_mask( negatives: torch.Tensor, targets: torch.Tensor, context_items: torch.Tensor, liked_items: torch.Tensor, ) -> torch.Tensor: """Identify targets, known positives, active likes, and row duplicates.""" invalid = negatives.eq(targets[:, None]) invalid |= negatives[:, :, None].eq(context_items[:, None, :]).any(dim=2) invalid |= negatives[:, :, None].eq(liked_items[:, None, :]).any(dim=2) for column in range(1, negatives.shape[1]): invalid[:, column] |= negatives[:, column, None].eq( negatives[:, :column] ).any(dim=1) return invalid def draw_filtered_mixed_negatives( targets: torch.Tensor, context_items: torch.Tensor, liked_items: torch.Tensor, n_items: int, uniform_count: int, inbatch_count: int, item_correction: torch.Tensor, generator: torch.Generator, device: torch.device, ) -> tuple[torch.Tensor, torch.Tensor]: """Draw uniform and unique-target in-batch negatives.""" batch_size = len(targets) uniform = torch.randint( n_items, (batch_size, uniform_count), generator=generator, device="cpu", ) inbatch = torch.empty((batch_size, 0), dtype=torch.long, device="cpu") corrected_count = 0 if inbatch_count: unique_targets = torch.unique(targets.detach().cpu()) corrected_count = min(inbatch_count, max(len(unique_targets) - 1, 0)) if corrected_count: priorities = torch.rand( (batch_size, len(unique_targets)), generator=generator ) priorities.masked_fill_( unique_targets[None, :].eq(targets.detach().cpu()[:, None]), -1.0, ) columns = torch.topk(priorities, k=corrected_count, dim=1).indices inbatch = unique_targets[columns] if corrected_count < inbatch_count: filler = torch.randint( n_items, (batch_size, inbatch_count - corrected_count), generator=generator, device="cpu", ) inbatch = torch.cat([inbatch, filler], dim=1) negatives_cpu = torch.cat([uniform, inbatch], dim=1) correction_cpu = torch.ones_like(negatives_cpu, dtype=torch.float32) if corrected_count: correction_cpu[ :, uniform_count : uniform_count + corrected_count ] = item_correction[inbatch[:, :corrected_count]] negatives = negatives_cpu.to(device) correction = correction_cpu.to(device) for _ in range(32): invalid = invalid_negative_mask( negatives, targets, context_items, liked_items ) if not bool(invalid.any()): return negatives, correction replacements = torch.randint( n_items, (int(invalid.sum().detach().cpu()),), generator=generator, device="cpu", ).to(device) negatives[invalid] = replacements correction[invalid] = 1.0 invalid = invalid_negative_mask( negatives, targets, context_items, liked_items ) if bool(invalid.any()): raise RuntimeError("mixed negative resampling failed false-negative filter") return negatives, correction """Estimate in-batch propensities from the selected training targets.""" counts = np.zeros(len(prepared.item_ids), dtype=np.float64) for user_row, count in enumerate(target_counts): if not count: continue offset = int(prepared.offsets[user_row]) target_start = int(target_starts[user_row]) counts += np.bincount( prepared.sequence_items[ offset + target_start + 1 : offset + target_start + int(count) + 1 ].astype(np.int64), minlength=len(prepared.item_ids), ) total = float(counts.sum()) probabilities = (counts + 1.0) / (total + len(counts)) raw = np.power( (1.0 / len(counts)) / probabilities, config.inbatch_correction_power, ) normalization = float(np.sum(counts * raw) / max(total, 1.0)) correction = np.clip( raw / max(normalization, 1.0e-12), config.inbatch_correction_min, config.inbatch_correction_max, ).astype(np.float32) mean_on_targets = float(np.sum(counts * correction) / max(total, 1.0)) log( f"inbatch correction: min={correction.min():.3f} " f"mean_on_targets={mean_on_targets:.3f} max={correction.max():.3f}" ) return torch.from_numpy(correction) def build_known_positive_filter( prepared: SequenceData, training_counts: np.ndarray ) -> np.ndarray: """Pack each user's complete public-training positive-item set.""" width = (len(prepared.item_ids) + 7) // 8 packed = np.zeros((len(prepared.user_ids), width), dtype=np.uint8) retained = 0 for user_row, target_count in enumerate(training_counts): if not target_count: continue offset = int(prepared.offsets[user_row]) # T adjacent targets consume sequence positions 0 through T. The # chronological BCE suffix starts at T + 1 and is intentionally absent. items = np.unique( prepared.sequence_items[ offset : offset + int(target_count) + 1 ].astype(np.int64) ) byte_columns = items >> 3 bit_values = np.left_shift( np.uint8(1), (items & 7).astype(np.uint8) ) np.bitwise_or.at(packed[user_row], byte_columns, bit_values) retained += len(items) log( f"full-history false-negative filter: users={len(prepared.user_ids):,} " f"unique_user_items={retained:,} bytes={packed.nbytes:,}" ) return packed def invalid_full_history_negatives( negatives: np.ndarray, targets: np.ndarray, user_rows: np.ndarray, known_positive_packed: np.ndarray, liked_items: np.ndarray, ) -> np.ndarray: """Return row-level invalid negatives using the complete training prefix.""" byte_columns = negatives >> 3 bit_columns = negatives & 7 known = known_positive_packed[user_rows[:, None], byte_columns] invalid = ((known >> bit_columns) & 1).astype(bool) invalid |= negatives == targets[:, None] invalid |= (negatives[:, :, None] == liked_items[:, None, :]).any(axis=2) for column in range(1, negatives.shape[1]): invalid[:, column] |= ( negatives[:, column, None] == negatives[:, :column] ).any(axis=1) return invalid def draw_full_history_filtered_negatives( targets: torch.Tensor, user_rows: np.ndarray, liked_items: torch.Tensor, known_positive_packed: np.ndarray, n_items: int, config: Config, item_correction: torch.Tensor, generator: torch.Generator, device: torch.device, ) -> tuple[torch.Tensor, torch.Tensor]: """Draw mixed negatives and reject all known public-training positives.""" targets_cpu = targets.detach().cpu().numpy().astype(np.int64, copy=False) liked_cpu = liked_items.detach().cpu().numpy().astype(np.int64, copy=False) batch_size = len(targets_cpu) uniform = torch.randint( n_items, (batch_size, config.uniform_negatives), generator=generator, device="cpu", ) inbatch = torch.empty((batch_size, 0), dtype=torch.long) corrected_count = 0 if config.inbatch_negatives: unique_targets = torch.unique(targets.detach().cpu()) corrected_count = min( config.inbatch_negatives, max(len(unique_targets) - 1, 0) ) if corrected_count: priorities = torch.rand( (batch_size, len(unique_targets)), generator=generator ) priorities.masked_fill_( unique_targets[None, :].eq( torch.from_numpy(targets_cpu)[:, None] ), -1.0, ) columns = torch.topk( priorities, k=corrected_count, dim=1 ).indices inbatch = unique_targets[columns] if corrected_count < config.inbatch_negatives: filler = torch.randint( n_items, (batch_size, config.inbatch_negatives - corrected_count), generator=generator, device="cpu", ) inbatch = torch.cat([inbatch, filler], dim=1) negatives = torch.cat([uniform, inbatch], dim=1).numpy() correction = np.ones_like(negatives, dtype=np.float32) if corrected_count: correction[ :, config.uniform_negatives : config.uniform_negatives + corrected_count ] = item_correction[inbatch[:, :corrected_count]].numpy() for _ in range(32): invalid = invalid_full_history_negatives( negatives, targets_cpu, user_rows, known_positive_packed, liked_cpu, ) if not np.any(invalid): return ( torch.from_numpy(negatives).to(device), torch.from_numpy(correction).to(device), ) replacements = torch.randint( n_items, (int(invalid.sum()),), generator=generator, device="cpu", ).numpy() negatives[invalid] = replacements # Rejected in-batch items become ordinary uniform draws. correction[invalid] = 1.0 invalid = invalid_full_history_negatives( negatives, targets_cpu, user_rows, known_positive_packed, liked_cpu, ) if np.any(invalid): raise RuntimeError("full-history negative resampling failed") return ( torch.from_numpy(negatives).to(device), torch.from_numpy(correction).to(device), ) def draw_training_negatives( positive_items: torch.Tensor, known_history: torch.Tensor, liked_items: torch.Tensor, user_rows: np.ndarray, known_positive_packed: np.ndarray | None, prepared: SequenceData, config: Config, item_correction: torch.Tensor, generator: torch.Generator, device: torch.device, ) -> tuple[torch.Tensor, torch.Tensor]: if config.negative_filter_scope == "full-training-history": if known_positive_packed is None: raise RuntimeError("full-history negative filter was not built") return draw_full_history_filtered_negatives( positive_items, user_rows, liked_items, known_positive_packed, len(prepared.item_ids), config, item_correction, generator, device, ) return base.draw_filtered_mixed_negatives( positive_items, known_history, liked_items, len(prepared.item_ids), config.uniform_negatives, config.inbatch_negatives, item_correction, generator, device, ) def event_sequence( model: base.SequentialTwoTower, items: torch.Tensor, features: torch.Tensor, hidden: torch.Tensor, ) -> tuple[torch.Tensor, torch.Tensor]: inputs = torch.cat([model.context_embedding(items), features], dim=-1) projected = model.event_projection(inputs) return model.sequence_encoder(projected, hidden) def pool_explicit_states( model: base.SequentialTwoTower, prepared: SequenceData, state_ids: np.ndarray, device: torch.device, ) -> tuple[torch.Tensor, torch.Tensor, torch.Tensor]: unique_states, inverse = np.unique(state_ids, return_inverse=True) liked_items = torch.from_numpy( prepared.liked_states[unique_states].astype(np.int64) ).to(device) disliked_items = torch.from_numpy( prepared.disliked_states[unique_states].astype(np.int64) ).to(device) liked_vectors = model._mean_context_channel(liked_items) disliked_vectors = model._mean_context_channel(disliked_items) inverse_rows = torch.from_numpy(inverse.astype(np.int64)).to(device) counts = prepared.state_counts[state_ids] return ( liked_vectors[inverse_rows], disliked_vectors[inverse_rows], torch.from_numpy(counts.astype(np.float32)).to(device), ) def user_queries( model: base.SequentialTwoTower, sequence_vectors: torch.Tensor, liked_vectors: torch.Tensor, disliked_vectors: torch.Tensor, user_features: torch.Tensor, ) -> torch.Tensor: return model.user_tower( torch.cat( [sequence_vectors, liked_vectors, disliked_vectors, user_features], dim=1, ) ) def candidate_vectors( model: base.SequentialTwoTower, positives: torch.Tensor, negatives: torch.Tensor, ) -> tuple[torch.Tensor, torch.Tensor]: all_items = torch.cat([positives, negatives.reshape(-1)]) unique_items, inverse = torch.unique(all_items, return_inverse=True) encoded = model.encode_items(unique_items) positive_vectors = encoded[inverse[: len(positives)]] negative_vectors = encoded[inverse[len(positives) :]].reshape( len(positives), negatives.shape[1], -1 ) return positive_vectors, negative_vectors def history_windows( sequence: np.ndarray, start: int, count: int, width: int, padding_item: int, ) -> np.ndarray: base_start = max(0, start - width + 1) segment = sequence[base_start : start + count] padded = np.concatenate( [np.full(width - 1, padding_item, dtype=np.uint16), segment] ) windows = np.lib.stride_tricks.sliding_window_view(padded, width) offset = start - base_start return windows[offset : offset + count].copy() def corrected_negative_loss( logits: torch.Tensor, correction: torch.Tensor, config: Config, ) -> torch.Tensor: raw = F.softplus(logits) total = config.uniform_negatives + config.inbatch_negatives result = torch.zeros(len(logits), device=logits.device) if config.uniform_negatives: result += config.uniform_negatives * raw[ :, : config.uniform_negatives ].mean(dim=1) if config.inbatch_negatives: selected = slice(config.uniform_negatives, total) weights = correction[:, selected] result += config.inbatch_negatives * ( (raw[:, selected] * weights).sum(dim=1) / weights.sum(dim=1).clamp_min(1.0e-6) ) return result / total def retained_target_window_starts( total_targets: np.ndarray, validation_counts: np.ndarray, training_counts: np.ndarray, ) -> np.ndarray: """Return the discarded prefix before the retained chronological suffix.""" training_region_ends = total_targets - validation_counts window_starts = training_region_ends - training_counts if ( np.any(window_starts < 0) or np.any(training_counts < 0) or np.any(validation_counts < 0) ): raise RuntimeError("chronological target partition produced negative counts") ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-29473453-967a-4350-98b7-d95e44f02756", "process_id": "48353", "command": [ "/bin/sh", "-lc", "which -a python python3; python -V; python3 -c 'import sys; print(sys.executable); print(sys.path)' ; sed -n '1920,2165p' /app/solution/train_current_model.py; sed -n '330,455p' /app/solution/two_tower_model.py; sed -n '540,880p' /app/solution/train_current_model.py" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "which -a python python3; python -V; python3 -c 'import sys; print(sys.executable); print(sys.path)' ; sed -n '1920,2165p' /app/solution/train_current_model.py; sed -n '330,455p' /app/solution/two_tower_model.py; sed -n '540,880p' /app/solution/train_current_model.py" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "/usr/local/bin/python\n/usr/local/bin/python3\nPython 3.12.13\n/usr/local/bin/python3\n['', '/usr/local/lib/python312.zip', '/usr/local/lib/python3.12', '/usr/local/lib/python3.12/lib-dynload', '/usr/local/lib/python3.12/site-packages']\n\n\ndef main() -> int:\n parser = argparse.ArgumentParser(description=__doc__)\n parser.add_argument(\n \"--stage\", choices=(\"validation\", \"submission\"), default=\"validation\"\n )\n parser.add_argument(\"--output\", type=Path, required=True)\n parser.add_argument(\"--public-dir\", type=Path, required=True)\n parser.add_argument(\"--prepared-cache\", type=Path)\n parser.add_argument(\"--device\", choices=(\"cpu\", \"mps\"), default=\"cpu\")\n parser.add_argument(\"--threads\", type=int, default=8)\n parser.add_argument(\"--bptt-steps\", type=int, default=Config.bptt_steps)\n parser.add_argument(\n \"--user-batch-size\", type=int, default=Config.user_batch_size\n )\n parser.add_argument(\"--epochs\", type=int, default=Config.epochs)\n parser.add_argument(\"--learning-rate\", type=float, default=Config.learning_rate)\n parser.add_argument(\n \"--loss-microbatch-size\",\n type=int,\n default=Config.loss_microbatch_size,\n )\n parser.add_argument(\n \"--negative-filter-scope\",\n choices=(\"full-training-history\", \"last-100\"),\n default=Config.negative_filter_scope,\n )\n parser.add_argument(\n \"--target-weighting\",\n choices=(\"discovery-graded\", \"organic-strong\", \"uniform\"),\n default=Config.target_weighting,\n )\n parser.add_argument(\n \"--ordinary-target-weight\",\n type=float,\n default=Config.ordinary_target_weight,\n )\n parser.add_argument(\n \"--organic-strong-target-weight\",\n type=float,\n default=Config.organic_strong_target_weight,\n )\n parser.add_argument(\n \"--organic-like-target-weight\",\n type=float,\n default=Config.organic_like_target_weight,\n )\n parser.add_argument(\n \"--discovery-horizon-days\",\n type=int,\n default=Config.discovery_horizon_days,\n )\n parser.add_argument(\n \"--validation-fraction\",\n type=float,\n default=Config.validation_fraction,\n )\n parser.add_argument(\n \"--max-train-targets-per-user\",\n type=int,\n default=Config.max_train_targets_per_user,\n help=\"retain this many recent pre-validation targets per user; 0 is uncapped\",\n )\n parser.add_argument(\n \"--max-validation-targets-per-user\",\n type=int,\n default=Config.max_validation_targets_per_user,\n help=\"retain this many final validation targets per user; 0 is uncapped\",\n )\n parser.add_argument(\n \"--early-stopping-patience\",\n type=int,\n default=Config.early_stopping_patience,\n )\n parser.add_argument(\n \"--early-stopping-min-delta\",\n type=float,\n default=Config.early_stopping_min_delta,\n )\n parser.add_argument(\"--checkpoint-dir\", type=Path)\n parser.add_argument(\"--resume-checkpoint\", type=Path)\n parser.add_argument(\"--seed\", type=int, default=Config.seed)\n parser.add_argument(\"--ranking-batch-size\", type=int, default=64)\n parser.add_argument(\"--prepare-only\", action=\"store_true\")\n args = parser.parse_args()\n\n if args.threads < 1 or args.bptt_steps < 2 or args.user_batch_size < 1:\n parser.error(\"threads, BPTT steps, and user batch size must be positive\")\n if (\n args.epochs < 1\n or args.learning_rate <= 0\n or args.loss_microbatch_size < 1\n or args.early_stopping_patience < 1\n or args.early_stopping_min_delta < 0\n or args.ordinary_target_weight <= 0\n or args.organic_strong_target_weight <= 0\n or args.organic_like_target_weight <= 0\n or args.discovery_horizon_days < 1\n or args.max_train_targets_per_user < 0\n or args.max_validation_targets_per_user < 0\n ):\n parser.error(\"training counts, learning rate, and patience are invalid\")\n if not 0.0 < args.validation_fraction < 1.0:\n parser.error(\"validation fraction must be strictly between zero and one\")\n public = args.public_dir.resolve()\n if not (public / \"data\" / \"candidate_catalog.parquet\").is_file():\n parser.error(f\"public task data not found under {public}\")\n config = Config(\n bptt_steps=args.bptt_steps,\n user_batch_size=args.user_batch_size,\n epochs=args.epochs,\n learning_rate=args.learning_rate,\n loss_microbatch_size=args.loss_microbatch_size,\n negative_filter_scope=args.negative_filter_scope,\n target_weighting=args.target_weighting,\n ordinary_target_weight=args.ordinary_target_weight,\n organic_strong_target_weight=args.organic_strong_target_weight,\n organic_like_target_weight=args.organic_like_target_weight,\n discovery_horizon_days=args.discovery_horizon_days,\n validation_fraction=args.validation_fraction,\n max_train_targets_per_user=args.max_train_targets_per_user,\n max_validation_targets_per_user=args.max_validation_targets_per_user,\n early_stopping_patience=args.early_stopping_patience,\n early_stopping_min_delta=args.early_stopping_min_delta,\n seed=args.seed,\n )\n torch.set_num_threads(args.threads)\n torch.set_num_interop_threads(1)\n seed_everything(config.seed)\n device = torch.device(args.device)\n if device.type == \"mps\" and not torch.backends.mps.is_available():\n parser.error(\"MPS was requested but is unavailable\")\n\n started = time.monotonic()\n prepared, eligibility = load_or_prepare(\n public,\n args.stage,\n config,\n args.prepared_cache.resolve() if args.prepared_cache else None,\n )\n target_partition = chronological_target_partition(\n prepared,\n config.validation_fraction,\n config.max_train_targets_per_user,\n config.max_validation_targets_per_user,\n )\n if args.prepare_only:\n print(\n json.dumps(\n {\n \"stage\": args.stage,\n \"sequence_users\": len(prepared.user_ids),\n \"sequence_tokens\": len(prepared.sequence_items),\n \"next_item_targets\": prepared.target_count,\n \"selected_training_targets\": int(\n target_partition.training_counts.sum()\n ),\n \"selected_validation_targets\": int(\n target_partition.validation_counts.sum()\n ),\n \"discarded_old_targets\": int(\n target_partition.window_starts.sum()\n ),\n \"target_users\": len(eligibility.uids),\n \"runtime_seconds\": round(time.monotonic() - started, 3),\n \"config\": asdict(config),\n },\n indent=2,\n )\n )\n return 0\n\n model, training_history = train_model(\n public,\n args.stage,\n prepared,\n config,\n device,\n args.checkpoint_dir.resolve() if args.checkpoint_dir else None,\n args.resume_checkpoint.resolve() if args.resume_checkpoint else None,\n )\n ranking, embedding_diagnostics = rank_candidates(\n model,\n prepared,\n eligibility,\n config,\n device,\n args.ranking_batch_size,\n )\n write_ranking(ranking, args.output.resolve())\n print(\n json.dumps(\n {\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": args.stage,\n \"output\": str(args.output.resolve()),\n \"rows\": len(ranking),\n \"users\": int(ranking.uid.nunique()),\n \"runtime_seconds\": round(time.monotonic() - started, 3),\n \"public_inputs_only\": True,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": (\n \"every-adjacent-target-within-recent-chronological-window\"\n ),\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": False,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": (\n \"24-uniform-plus-8-propensity-corrected-inbatch\"\n ),\n \"false_negative_filter\": config.negative_filter_scope,\n \"target_weighting\": config.target_weighting,\n },\n \"config\": asdict(config),\n \"sequence_tokens\": len(prepared.sequence_items),\n \"all_next_item_targets\": prepared.target_count,\n \"selected_training_targets\": int(\n target_partition.training_counts.sum()\n ),\n \"selected_validation_targets\": int(\n target_partition.validation_counts.sum()\n ),\n \"discarded_old_targets\": int(target_partition.window_starts.sum()),\n \"training_history\": training_history,\n \"embedding_diagnostics\": embedding_diagnostics,\n \"torch_version\": torch.__version__,\n \"device\": str(device),\n },\n indent=2,\n )\n )\n return 0\n\n\nif __name__ == \"__main__\":\n raise SystemExit(main())\n self.context_embedding.weight[n_items].zero_()\n\n def _mean_context_channel(self, items: torch.Tensor) -> torch.Tensor:\n mask = items.ne(self.n_items)\n vectors = self.context_embedding(items)\n return (vectors * mask.unsqueeze(-1)).sum(dim=1) / mask.sum(\n dim=1, keepdim=True\n ).clamp_min(1)\n\n def encode_items(self, items: torch.Tensor) -> torch.Tensor:\n inputs = torch.cat(\n [self.candidate_embedding(items), self.item_features[items]], dim=1\n )\n return self.item_tower(inputs)\n\n\ndef invalid_negative_mask(\n negatives: torch.Tensor,\n targets: torch.Tensor,\n context_items: torch.Tensor,\n liked_items: torch.Tensor,\n) -> torch.Tensor:\n \"\"\"Identify targets, known positives, active likes, and row duplicates.\"\"\"\n invalid = negatives.eq(targets[:, None])\n invalid |= negatives[:, :, None].eq(context_items[:, None, :]).any(dim=2)\n invalid |= negatives[:, :, None].eq(liked_items[:, None, :]).any(dim=2)\n for column in range(1, negatives.shape[1]):\n invalid[:, column] |= negatives[:, column, None].eq(\n negatives[:, :column]\n ).any(dim=1)\n return invalid\n\n\ndef draw_filtered_mixed_negatives(\n targets: torch.Tensor,\n context_items: torch.Tensor,\n liked_items: torch.Tensor,\n n_items: int,\n uniform_count: int,\n inbatch_count: int,\n item_correction: torch.Tensor,\n generator: torch.Generator,\n device: torch.device,\n) -> tuple[torch.Tensor, torch.Tensor]:\n \"\"\"Draw uniform and unique-target in-batch negatives.\"\"\"\n batch_size = len(targets)\n uniform = torch.randint(\n n_items,\n (batch_size, uniform_count),\n generator=generator,\n device=\"cpu\",\n )\n inbatch = torch.empty((batch_size, 0), dtype=torch.long, device=\"cpu\")\n corrected_count = 0\n if inbatch_count:\n unique_targets = torch.unique(targets.detach().cpu())\n corrected_count = min(inbatch_count, max(len(unique_targets) - 1, 0))\n if corrected_count:\n priorities = torch.rand(\n (batch_size, len(unique_targets)), generator=generator\n )\n priorities.masked_fill_(\n unique_targets[None, :].eq(targets.detach().cpu()[:, None]),\n -1.0,\n )\n columns = torch.topk(priorities, k=corrected_count, dim=1).indices\n inbatch = unique_targets[columns]\n if corrected_count < inbatch_count:\n filler = torch.randint(\n n_items,\n (batch_size, inbatch_count - corrected_count),\n generator=generator,\n device=\"cpu\",\n )\n inbatch = torch.cat([inbatch, filler], dim=1)\n\n negatives_cpu = torch.cat([uniform, inbatch], dim=1)\n correction_cpu = torch.ones_like(negatives_cpu, dtype=torch.float32)\n if corrected_count:\n correction_cpu[\n :, uniform_count : uniform_count + corrected_count\n ] = item_correction[inbatch[:, :corrected_count]]\n negatives = negatives_cpu.to(device)\n correction = correction_cpu.to(device)\n for _ in range(32):\n invalid = invalid_negative_mask(\n negatives, targets, context_items, liked_items\n )\n if not bool(invalid.any()):\n return negatives, correction\n replacements = torch.randint(\n n_items,\n (int(invalid.sum().detach().cpu()),),\n generator=generator,\n device=\"cpu\",\n ).to(device)\n negatives[invalid] = replacements\n correction[invalid] = 1.0\n invalid = invalid_negative_mask(\n negatives, targets, context_items, liked_items\n )\n if bool(invalid.any()):\n raise RuntimeError(\"mixed negative resampling failed false-negative filter\")\n return negatives, correction\n \"\"\"Estimate in-batch propensities from the selected training targets.\"\"\"\n counts = np.zeros(len(prepared.item_ids), dtype=np.float64)\n for user_row, count in enumerate(target_counts):\n if not count:\n continue\n offset = int(prepared.offsets[user_row])\n target_start = int(target_starts[user_row])\n counts += np.bincount(\n prepared.sequence_items[\n offset\n + target_start\n + 1 : offset\n + target_start\n + int(count)\n + 1\n ].astype(np.int64),\n minlength=len(prepared.item_ids),\n )\n total = float(counts.sum())\n probabilities = (counts + 1.0) / (total + len(counts))\n raw = np.power(\n (1.0 / len(counts)) / probabilities,\n config.inbatch_correction_power,\n )\n normalization = float(np.sum(counts * raw) / max(total, 1.0))\n correction = np.clip(\n raw / max(normalization, 1.0e-12),\n config.inbatch_correction_min,\n config.inbatch_correction_max,\n ).astype(np.float32)\n mean_on_targets = float(np.sum(counts * correction) / max(total, 1.0))\n log(\n f\"inbatch correction: min={correction.min():.3f} \"\n f\"mean_on_targets={mean_on_targets:.3f} max={correction.max():.3f}\"\n )\n return torch.from_numpy(correction)\n\n\ndef build_known_positive_filter(\n prepared: SequenceData, training_counts: np.ndarray\n) -> np.ndarray:\n \"\"\"Pack each user's complete public-training positive-item set.\"\"\"\n width = (len(prepared.item_ids) + 7) // 8\n packed = np.zeros((len(prepared.user_ids), width), dtype=np.uint8)\n retained = 0\n for user_row, target_count in enumerate(training_counts):\n if not target_count:\n continue\n offset = int(prepared.offsets[user_row])\n # T adjacent targets consume sequence positions 0 through T. The\n # chronological BCE suffix starts at T + 1 and is intentionally absent.\n items = np.unique(\n prepared.sequence_items[\n offset : offset + int(target_count) + 1\n ].astype(np.int64)\n )\n byte_columns = items >> 3\n bit_values = np.left_shift(\n np.uint8(1), (items & 7).astype(np.uint8)\n )\n np.bitwise_or.at(packed[user_row], byte_columns, bit_values)\n retained += len(items)\n log(\n f\"full-history false-negative filter: users={len(prepared.user_ids):,} \"\n f\"unique_user_items={retained:,} bytes={packed.nbytes:,}\"\n )\n return packed\n\n\ndef invalid_full_history_negatives(\n negatives: np.ndarray,\n targets: np.ndarray,\n user_rows: np.ndarray,\n known_positive_packed: np.ndarray,\n liked_items: np.ndarray,\n) -> np.ndarray:\n \"\"\"Return row-level invalid negatives using the complete training prefix.\"\"\"\n byte_columns = negatives >> 3\n bit_columns = negatives & 7\n known = known_positive_packed[user_rows[:, None], byte_columns]\n invalid = ((known >> bit_columns) & 1).astype(bool)\n invalid |= negatives == targets[:, None]\n invalid |= (negatives[:, :, None] == liked_items[:, None, :]).any(axis=2)\n for column in range(1, negatives.shape[1]):\n invalid[:, column] |= (\n negatives[:, column, None] == negatives[:, :column]\n ).any(axis=1)\n return invalid\n\n\ndef draw_full_history_filtered_negatives(\n targets: torch.Tensor,\n user_rows: np.ndarray,\n liked_items: torch.Tensor,\n known_positive_packed: np.ndarray,\n n_items: int,\n config: Config,\n item_correction: torch.Tensor,\n generator: torch.Generator,\n device: torch.device,\n) -> tuple[torch.Tensor, torch.Tensor]:\n \"\"\"Draw mixed negatives and reject all known public-training positives.\"\"\"\n targets_cpu = targets.detach().cpu().numpy().astype(np.int64, copy=False)\n liked_cpu = liked_items.detach().cpu().numpy().astype(np.int64, copy=False)\n batch_size = len(targets_cpu)\n uniform = torch.randint(\n n_items,\n (batch_size, config.uniform_negatives),\n generator=generator,\n device=\"cpu\",\n )\n inbatch = torch.empty((batch_size, 0), dtype=torch.long)\n corrected_count = 0\n if config.inbatch_negatives:\n unique_targets = torch.unique(targets.detach().cpu())\n corrected_count = min(\n config.inbatch_negatives, max(len(unique_targets) - 1, 0)\n )\n if corrected_count:\n priorities = torch.rand(\n (batch_size, len(unique_targets)), generator=generator\n )\n priorities.masked_fill_(\n unique_targets[None, :].eq(\n torch.from_numpy(targets_cpu)[:, None]\n ),\n -1.0,\n )\n columns = torch.topk(\n priorities, k=corrected_count, dim=1\n ).indices\n inbatch = unique_targets[columns]\n if corrected_count < config.inbatch_negatives:\n filler = torch.randint(\n n_items,\n (batch_size, config.inbatch_negatives - corrected_count),\n generator=generator,\n device=\"cpu\",\n )\n inbatch = torch.cat([inbatch, filler], dim=1)\n\n negatives = torch.cat([uniform, inbatch], dim=1).numpy()\n correction = np.ones_like(negatives, dtype=np.float32)\n if corrected_count:\n correction[\n :, config.uniform_negatives : config.uniform_negatives + corrected_count\n ] = item_correction[inbatch[:, :corrected_count]].numpy()\n for _ in range(32):\n invalid = invalid_full_history_negatives(\n negatives,\n targets_cpu,\n user_rows,\n known_positive_packed,\n liked_cpu,\n )\n if not np.any(invalid):\n return (\n torch.from_numpy(negatives).to(device),\n torch.from_numpy(correction).to(device),\n )\n replacements = torch.randint(\n n_items,\n (int(invalid.sum()),),\n generator=generator,\n device=\"cpu\",\n ).numpy()\n negatives[invalid] = replacements\n # Rejected in-batch items become ordinary uniform draws.\n correction[invalid] = 1.0\n invalid = invalid_full_history_negatives(\n negatives,\n targets_cpu,\n user_rows,\n known_positive_packed,\n liked_cpu,\n )\n if np.any(invalid):\n raise RuntimeError(\"full-history negative resampling failed\")\n return (\n torch.from_numpy(negatives).to(device),\n torch.from_numpy(correction).to(device),\n )\n\n\ndef draw_training_negatives(\n positive_items: torch.Tensor,\n known_history: torch.Tensor,\n liked_items: torch.Tensor,\n user_rows: np.ndarray,\n known_positive_packed: np.ndarray | None,\n prepared: SequenceData,\n config: Config,\n item_correction: torch.Tensor,\n generator: torch.Generator,\n device: torch.device,\n) -> tuple[torch.Tensor, torch.Tensor]:\n if config.negative_filter_scope == \"full-training-history\":\n if known_positive_packed is None:\n raise RuntimeError(\"full-history negative filter was not built\")\n return draw_full_history_filtered_negatives(\n positive_items,\n user_rows,\n liked_items,\n known_positive_packed,\n len(prepared.item_ids),\n config,\n item_correction,\n generator,\n device,\n )\n return base.draw_filtered_mixed_negatives(\n positive_items,\n known_history,\n liked_items,\n len(prepared.item_ids),\n config.uniform_negatives,\n config.inbatch_negatives,\n item_correction,\n generator,\n device,\n )\n\n\ndef event_sequence(\n model: base.SequentialTwoTower,\n items: torch.Tensor,\n features: torch.Tensor,\n hidden: torch.Tensor,\n) -> tuple[torch.Tensor, torch.Tensor]:\n inputs = torch.cat([model.context_embedding(items), features], dim=-1)\n projected = model.event_projection(inputs)\n return model.sequence_encoder(projected, hidden)\n\n\ndef pool_explicit_states(\n model: base.SequentialTwoTower,\n prepared: SequenceData,\n state_ids: np.ndarray,\n device: torch.device,\n) -> tuple[torch.Tensor, torch.Tensor, torch.Tensor]:\n unique_states, inverse = np.unique(state_ids, return_inverse=True)\n liked_items = torch.from_numpy(\n prepared.liked_states[unique_states].astype(np.int64)\n ).to(device)\n disliked_items = torch.from_numpy(\n prepared.disliked_states[unique_states].astype(np.int64)\n ).to(device)\n liked_vectors = model._mean_context_channel(liked_items)\n disliked_vectors = model._mean_context_channel(disliked_items)\n inverse_rows = torch.from_numpy(inverse.astype(np.int64)).to(device)\n counts = prepared.state_counts[state_ids]\n return (\n liked_vectors[inverse_rows],\n disliked_vectors[inverse_rows],\n torch.from_numpy(counts.astype(np.float32)).to(device),\n )\n\n\ndef user_queries(\n model: base.SequentialTwoTower,\n sequence_vectors: torch.Tensor,\n liked_vectors: torch.Tensor,\n disliked_vectors: torch.Tensor,\n user_features: torch.Tensor,\n) -> torch.Tensor:\n return model.user_tower(\n torch.cat(\n [sequence_vectors, liked_vectors, disliked_vectors, user_features],\n dim=1,\n )\n )\n\n\ndef candidate_vectors(\n model: base.SequentialTwoTower,\n positives: torch.Tensor,\n negatives: torch.Tensor,\n) -> tuple[torch.Tensor, torch.Tensor]:\n all_items = torch.cat([positives, negatives.reshape(-1)])\n unique_items, inverse = torch.unique(all_items, return_inverse=True)\n encoded = model.encode_items(unique_items)\n positive_vectors = encoded[inverse[: len(positives)]]\n negative_vectors = encoded[inverse[len(positives) :]].reshape(\n len(positives), negatives.shape[1], -1\n )\n return positive_vectors, negative_vectors\n\n\ndef history_windows(\n sequence: np.ndarray,\n start: int,\n count: int,\n width: int,\n padding_item: int,\n) -> np.ndarray:\n base_start = max(0, start - width + 1)\n segment = sequence[base_start : start + count]\n padded = np.concatenate(\n [np.full(width - 1, padding_item, dtype=np.uint16), segment]\n )\n windows = np.lib.stride_tricks.sliding_window_view(padded, width)\n offset = start - base_start\n return windows[offset : offset + count].copy()\n\n\ndef corrected_negative_loss(\n logits: torch.Tensor,\n correction: torch.Tensor,\n config: Config,\n) -> torch.Tensor:\n raw = F.softplus(logits)\n total = config.uniform_negatives + config.inbatch_negatives\n result = torch.zeros(len(logits), device=logits.device)\n if config.uniform_negatives:\n result += config.uniform_negatives * raw[\n :, : config.uniform_negatives\n ].mean(dim=1)\n if config.inbatch_negatives:\n selected = slice(config.uniform_negatives, total)\n weights = correction[:, selected]\n result += config.inbatch_negatives * (\n (raw[:, selected] * weights).sum(dim=1)\n / weights.sum(dim=1).clamp_min(1.0e-6)\n )\n return result / total\n\n\ndef retained_target_window_starts(\n total_targets: np.ndarray,\n validation_counts: np.ndarray,\n training_counts: np.ndarray,\n) -> np.ndarray:\n \"\"\"Return the discarded prefix before the retained chronological suffix.\"\"\"\n training_region_ends = total_targets - validation_counts\n window_starts = training_region_ends - training_counts\n if (\n np.any(window_starts < 0)\n or np.any(training_counts < 0)\n or np.any(validation_counts < 0)\n ):\n raise RuntimeError(\"chronological target partition produced negative counts\")\n", "stderr": "", "aggregated_output": "/usr/local/bin/python\n/usr/local/bin/python3\nPython 3.12.13\n/usr/local/bin/python3\n['', '/usr/local/lib/python312.zip', '/usr/local/lib/python3.12', '/usr/local/lib/python3.12/lib-dynload', '/usr/local/lib/python3.12/site-packages']\n\n\ndef main() -> int:\n parser = argparse.ArgumentParser(description=__doc__)\n parser.add_argument(\n \"--stage\", choices=(\"validation\", \"submission\"), default=\"validation\"\n )\n parser.add_argument(\"--output\", type=Path, required=True)\n parser.add_argument(\"--public-dir\", type=Path, required=True)\n parser.add_argument(\"--prepared-cache\", type=Path)\n parser.add_argument(\"--device\", choices=(\"cpu\", \"mps\"), default=\"cpu\")\n parser.add_argument(\"--threads\", type=int, default=8)\n parser.add_argument(\"--bptt-steps\", type=int, default=Config.bptt_steps)\n parser.add_argument(\n \"--user-batch-size\", type=int, default=Config.user_batch_size\n )\n parser.add_argument(\"--epochs\", type=int, default=Config.epochs)\n parser.add_argument(\"--learning-rate\", type=float, default=Config.learning_rate)\n parser.add_argument(\n \"--loss-microbatch-size\",\n type=int,\n default=Config.loss_microbatch_size,\n )\n parser.add_argument(\n \"--negative-filter-scope\",\n choices=(\"full-training-history\", \"last-100\"),\n default=Config.negative_filter_scope,\n )\n parser.add_argument(\n \"--target-weighting\",\n choices=(\"discovery-graded\", \"organic-strong\", \"uniform\"),\n default=Config.target_weighting,\n )\n parser.add_argument(\n \"--ordinary-target-weight\",\n type=float,\n default=Config.ordinary_target_weight,\n )\n parser.add_argument(\n \"--organic-strong-target-weight\",\n type=float,\n default=Config.organic_strong_target_weight,\n )\n parser.add_argument(\n \"--organic-like-target-weight\",\n type=float,\n default=Config.organic_like_target_weight,\n )\n parser.add_argument(\n \"--discovery-horizon-days\",\n type=int,\n default=Config.discovery_horizon_days,\n )\n parser.add_argument(\n \"--validation-fraction\",\n type=float,\n default=Config.validation_fraction,\n )\n parser.add_argument(\n \"--max-train-targets-per-user\",\n type=int,\n default=Config.max_train_targets_per_user,\n help=\"retain this many recent pre-validation targets per user; 0 is uncapped\",\n )\n parser.add_argument(\n \"--max-validation-targets-per-user\",\n type=int,\n default=Config.max_validation_targets_per_user,\n help=\"retain this many final validation targets per user; 0 is uncapped\",\n )\n parser.add_argument(\n \"--early-stopping-patience\",\n type=int,\n default=Config.early_stopping_patience,\n )\n parser.add_argument(\n \"--early-stopping-min-delta\",\n type=float,\n default=Config.early_stopping_min_delta,\n )\n parser.add_argument(\"--checkpoint-dir\", type=Path)\n parser.add_argument(\"--resume-checkpoint\", type=Path)\n parser.add_argument(\"--seed\", type=int, default=Config.seed)\n parser.add_argument(\"--ranking-batch-size\", type=int, default=64)\n parser.add_argument(\"--prepare-only\", action=\"store_true\")\n args = parser.parse_args()\n\n if args.threads < 1 or args.bptt_steps < 2 or args.user_batch_size < 1:\n parser.error(\"threads, BPTT steps, and user batch size must be positive\")\n if (\n args.epochs < 1\n or args.learning_rate <= 0\n or args.loss_microbatch_size < 1\n or args.early_stopping_patience < 1\n or args.early_stopping_min_delta < 0\n or args.ordinary_target_weight <= 0\n or args.organic_strong_target_weight <= 0\n or args.organic_like_target_weight <= 0\n or args.discovery_horizon_days < 1\n or args.max_train_targets_per_user < 0\n or args.max_validation_targets_per_user < 0\n ):\n parser.error(\"training counts, learning rate, and patience are invalid\")\n if not 0.0 < args.validation_fraction < 1.0:\n parser.error(\"validation fraction must be strictly between zero and one\")\n public = args.public_dir.resolve()\n if not (public / \"data\" / \"candidate_catalog.parquet\").is_file():\n parser.error(f\"public task data not found under {public}\")\n config = Config(\n bptt_steps=args.bptt_steps,\n user_batch_size=args.user_batch_size,\n epochs=args.epochs,\n learning_rate=args.learning_rate,\n loss_microbatch_size=args.loss_microbatch_size,\n negative_filter_scope=args.negative_filter_scope,\n target_weighting=args.target_weighting,\n ordinary_target_weight=args.ordinary_target_weight,\n organic_strong_target_weight=args.organic_strong_target_weight,\n organic_like_target_weight=args.organic_like_target_weight,\n discovery_horizon_days=args.discovery_horizon_days,\n validation_fraction=args.validation_fraction,\n max_train_targets_per_user=args.max_train_targets_per_user,\n max_validation_targets_per_user=args.max_validation_targets_per_user,\n early_stopping_patience=args.early_stopping_patience,\n early_stopping_min_delta=args.early_stopping_min_delta,\n seed=args.seed,\n )\n torch.set_num_threads(args.threads)\n torch.set_num_interop_threads(1)\n seed_everything(config.seed)\n device = torch.device(args.device)\n if device.type == \"mps\" and not torch.backends.mps.is_available():\n parser.error(\"MPS was requested but is unavailable\")\n\n started = time.monotonic()\n prepared, eligibility = load_or_prepare(\n public,\n args.stage,\n config,\n args.prepared_cache.resolve() if args.prepared_cache else None,\n )\n target_partition = chronological_target_partition(\n prepared,\n config.validation_fraction,\n config.max_train_targets_per_user,\n config.max_validation_targets_per_user,\n )\n if args.prepare_only:\n print(\n json.dumps(\n {\n \"stage\": args.stage,\n \"sequence_users\": len(prepared.user_ids),\n \"sequence_tokens\": len(prepared.sequence_items),\n \"next_item_targets\": prepared.target_count,\n \"selected_training_targets\": int(\n target_partition.training_counts.sum()\n ),\n \"selected_validation_targets\": int(\n target_partition.validation_counts.sum()\n ),\n \"discarded_old_targets\": int(\n target_partition.window_starts.sum()\n ),\n \"target_users\": len(eligibility.uids),\n \"runtime_seconds\": round(time.monotonic() - started, 3),\n \"config\": asdict(config),\n },\n indent=2,\n )\n )\n return 0\n\n model, training_history = train_model(\n public,\n args.stage,\n prepared,\n config,\n device,\n args.checkpoint_dir.resolve() if args.checkpoint_dir else None,\n args.resume_checkpoint.resolve() if args.resume_checkpoint else None,\n )\n ranking, embedding_diagnostics = rank_candidates(\n model,\n prepared,\n eligibility,\n config,\n device,\n args.ranking_batch_size,\n )\n write_ranking(ranking, args.output.resolve())\n print(\n json.dumps(\n {\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": args.stage,\n \"output\": str(args.output.resolve()),\n \"rows\": len(ranking),\n \"users\": int(ranking.uid.nunique()),\n \"runtime_seconds\": round(time.monotonic() - started, 3),\n \"public_inputs_only\": True,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": (\n \"every-adjacent-target-within-recent-chronological-window\"\n ),\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": False,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": (\n \"24-uniform-plus-8-propensity-corrected-inbatch\"\n ),\n \"false_negative_filter\": config.negative_filter_scope,\n \"target_weighting\": config.target_weighting,\n },\n \"config\": asdict(config),\n \"sequence_tokens\": len(prepared.sequence_items),\n \"all_next_item_targets\": prepared.target_count,\n \"selected_training_targets\": int(\n target_partition.training_counts.sum()\n ),\n \"selected_validation_targets\": int(\n target_partition.validation_counts.sum()\n ),\n \"discarded_old_targets\": int(target_partition.window_starts.sum()),\n \"training_history\": training_history,\n \"embedding_diagnostics\": embedding_diagnostics,\n \"torch_version\": torch.__version__,\n \"device\": str(device),\n },\n indent=2,\n )\n )\n return 0\n\n\nif __name__ == \"__main__\":\n raise SystemExit(main())\n self.context_embedding.weight[n_items].zero_()\n\n def _mean_context_channel(self, items: torch.Tensor) -> torch.Tensor:\n mask = items.ne(self.n_items)\n vectors = self.context_embedding(items)\n return (vectors * mask.unsqueeze(-1)).sum(dim=1) / mask.sum(\n dim=1, keepdim=True\n ).clamp_min(1)\n\n def encode_items(self, items: torch.Tensor) -> torch.Tensor:\n inputs = torch.cat(\n [self.candidate_embedding(items), self.item_features[items]], dim=1\n )\n return self.item_tower(inputs)\n\n\ndef invalid_negative_mask(\n negatives: torch.Tensor,\n targets: torch.Tensor,\n context_items: torch.Tensor,\n liked_items: torch.Tensor,\n) -> torch.Tensor:\n \"\"\"Identify targets, known positives, active likes, and row duplicates.\"\"\"\n invalid = negatives.eq(targets[:, None])\n invalid |= negatives[:, :, None].eq(context_items[:, None, :]).any(dim=2)\n invalid |= negatives[:, :, None].eq(liked_items[:, None, :]).any(dim=2)\n for column in range(1, negatives.shape[1]):\n invalid[:, column] |= negatives[:, column, None].eq(\n negatives[:, :column]\n ).any(dim=1)\n return invalid\n\n\ndef draw_filtered_mixed_negatives(\n targets: torch.Tensor,\n context_items: torch.Tensor,\n liked_items: torch.Tensor,\n n_items: int,\n uniform_count: int,\n inbatch_count: int,\n item_correction: torch.Tensor,\n generator: torch.Generator,\n device: torch.device,\n) -> tuple[torch.Tensor, torch.Tensor]:\n \"\"\"Draw uniform and unique-target in-batch negatives.\"\"\"\n batch_size = len(targets)\n uniform = torch.randint(\n n_items,\n (batch_size, uniform_count),\n generator=generator,\n device=\"cpu\",\n )\n inbatch = torch.empty((batch_size, 0), dtype=torch.long, device=\"cpu\")\n corrected_count = 0\n if inbatch_count:\n unique_targets = torch.unique(targets.detach().cpu())\n corrected_count = min(inbatch_count, max(len(unique_targets) - 1, 0))\n if corrected_count:\n priorities = torch.rand(\n (batch_size, len(unique_targets)), generator=generator\n )\n priorities.masked_fill_(\n unique_targets[None, :].eq(targets.detach().cpu()[:, None]),\n -1.0,\n )\n columns = torch.topk(priorities, k=corrected_count, dim=1).indices\n inbatch = unique_targets[columns]\n if corrected_count < inbatch_count:\n filler = torch.randint(\n n_items,\n (batch_size, inbatch_count - corrected_count),\n generator=generator,\n device=\"cpu\",\n )\n inbatch = torch.cat([inbatch, filler], dim=1)\n\n negatives_cpu = torch.cat([uniform, inbatch], dim=1)\n correction_cpu = torch.ones_like(negatives_cpu, dtype=torch.float32)\n if corrected_count:\n correction_cpu[\n :, uniform_count : uniform_count + corrected_count\n ] = item_correction[inbatch[:, :corrected_count]]\n negatives = negatives_cpu.to(device)\n correction = correction_cpu.to(device)\n for _ in range(32):\n invalid = invalid_negative_mask(\n negatives, targets, context_items, liked_items\n )\n if not bool(invalid.any()):\n return negatives, correction\n replacements = torch.randint(\n n_items,\n (int(invalid.sum().detach().cpu()),),\n generator=generator,\n device=\"cpu\",\n ).to(device)\n negatives[invalid] = replacements\n correction[invalid] = 1.0\n invalid = invalid_negative_mask(\n negatives, targets, context_items, liked_items\n )\n if bool(invalid.any()):\n raise RuntimeError(\"mixed negative resampling failed false-negative filter\")\n return negatives, correction\n \"\"\"Estimate in-batch propensities from the selected training targets.\"\"\"\n counts = np.zeros(len(prepared.item_ids), dtype=np.float64)\n for user_row, count in enumerate(target_counts):\n if not count:\n continue\n offset = int(prepared.offsets[user_row])\n target_start = int(target_starts[user_row])\n counts += np.bincount(\n prepared.sequence_items[\n offset\n + target_start\n + 1 : offset\n + target_start\n + int(count)\n + 1\n ].astype(np.int64),\n minlength=len(prepared.item_ids),\n )\n total = float(counts.sum())\n probabilities = (counts + 1.0) / (total + len(counts))\n raw = np.power(\n (1.0 / len(counts)) / probabilities,\n config.inbatch_correction_power,\n )\n normalization = float(np.sum(counts * raw) / max(total, 1.0))\n correction = np.clip(\n raw / max(normalization, 1.0e-12),\n config.inbatch_correction_min,\n config.inbatch_correction_max,\n ).astype(np.float32)\n mean_on_targets = float(np.sum(counts * correction) / max(total, 1.0))\n log(\n f\"inbatch correction: min={correction.min():.3f} \"\n f\"mean_on_targets={mean_on_targets:.3f} max={correction.max():.3f}\"\n )\n return torch.from_numpy(correction)\n\n\ndef build_known_positive_filter(\n prepared: SequenceData, training_counts: np.ndarray\n) -> np.ndarray:\n \"\"\"Pack each user's complete public-training positive-item set.\"\"\"\n width = (len(prepared.item_ids) + 7) // 8\n packed = np.zeros((len(prepared.user_ids), width), dtype=np.uint8)\n retained = 0\n for user_row, target_count in enumerate(training_counts):\n if not target_count:\n continue\n offset = int(prepared.offsets[user_row])\n # T adjacent targets consume sequence positions 0 through T. The\n # chronological BCE suffix starts at T + 1 and is intentionally absent.\n items = np.unique(\n prepared.sequence_items[\n offset : offset + int(target_count) + 1\n ].astype(np.int64)\n )\n byte_columns = items >> 3\n bit_values = np.left_shift(\n np.uint8(1), (items & 7).astype(np.uint8)\n )\n np.bitwise_or.at(packed[user_row], byte_columns, bit_values)\n retained += len(items)\n log(\n f\"full-history false-negative filter: users={len(prepared.user_ids):,} \"\n f\"unique_user_items={retained:,} bytes={packed.nbytes:,}\"\n )\n return packed\n\n\ndef invalid_full_history_negatives(\n negatives: np.ndarray,\n targets: np.ndarray,\n user_rows: np.ndarray,\n known_positive_packed: np.ndarray,\n liked_items: np.ndarray,\n) -> np.ndarray:\n \"\"\"Return row-level invalid negatives using the complete training prefix.\"\"\"\n byte_columns = negatives >> 3\n bit_columns = negatives & 7\n known = known_positive_packed[user_rows[:, None], byte_columns]\n invalid = ((known >> bit_columns) & 1).astype(bool)\n invalid |= negatives == targets[:, None]\n invalid |= (negatives[:, :, None] == liked_items[:, None, :]).any(axis=2)\n for column in range(1, negatives.shape[1]):\n invalid[:, column] |= (\n negatives[:, column, None] == negatives[:, :column]\n ).any(axis=1)\n return invalid\n\n\ndef draw_full_history_filtered_negatives(\n targets: torch.Tensor,\n user_rows: np.ndarray,\n liked_items: torch.Tensor,\n known_positive_packed: np.ndarray,\n n_items: int,\n config: Config,\n item_correction: torch.Tensor,\n generator: torch.Generator,\n device: torch.device,\n) -> tuple[torch.Tensor, torch.Tensor]:\n \"\"\"Draw mixed negatives and reject all known public-training positives.\"\"\"\n targets_cpu = targets.detach().cpu().numpy().astype(np.int64, copy=False)\n liked_cpu = liked_items.detach().cpu().numpy().astype(np.int64, copy=False)\n batch_size = len(targets_cpu)\n uniform = torch.randint(\n n_items,\n (batch_size, config.uniform_negatives),\n generator=generator,\n device=\"cpu\",\n )\n inbatch = torch.empty((batch_size, 0), dtype=torch.long)\n corrected_count = 0\n if config.inbatch_negatives:\n unique_targets = torch.unique(targets.detach().cpu())\n corrected_count = min(\n config.inbatch_negatives, max(len(unique_targets) - 1, 0)\n )\n if corrected_count:\n priorities = torch.rand(\n (batch_size, len(unique_targets)), generator=generator\n )\n priorities.masked_fill_(\n unique_targets[None, :].eq(\n torch.from_numpy(targets_cpu)[:, None]\n ),\n -1.0,\n )\n columns = torch.topk(\n priorities, k=corrected_count, dim=1\n ).indices\n inbatch = unique_targets[columns]\n if corrected_count < config.inbatch_negatives:\n filler = torch.randint(\n n_items,\n (batch_size, config.inbatch_negatives - corrected_count),\n generator=generator,\n device=\"cpu\",\n )\n inbatch = torch.cat([inbatch, filler], dim=1)\n\n negatives = torch.cat([uniform, inbatch], dim=1).numpy()\n correction = np.ones_like(negatives, dtype=np.float32)\n if corrected_count:\n correction[\n :, config.uniform_negatives : config.uniform_negatives + corrected_count\n ] = item_correction[inbatch[:, :corrected_count]].numpy()\n for _ in range(32):\n invalid = invalid_full_history_negatives(\n negatives,\n targets_cpu,\n user_rows,\n known_positive_packed,\n liked_cpu,\n )\n if not np.any(invalid):\n return (\n torch.from_numpy(negatives).to(device),\n torch.from_numpy(correction).to(device),\n )\n replacements = torch.randint(\n n_items,\n (int(invalid.sum()),),\n generator=generator,\n device=\"cpu\",\n ).numpy()\n negatives[invalid] = replacements\n # Rejected in-batch items become ordinary uniform draws.\n correction[invalid] = 1.0\n invalid = invalid_full_history_negatives(\n negatives,\n targets_cpu,\n user_rows,\n known_positive_packed,\n liked_cpu,\n )\n if np.any(invalid):\n raise RuntimeError(\"full-history negative resampling failed\")\n return (\n torch.from_numpy(negatives).to(device),\n torch.from_numpy(correction).to(device),\n )\n\n\ndef draw_training_negatives(\n positive_items: torch.Tensor,\n known_history: torch.Tensor,\n liked_items: torch.Tensor,\n user_rows: np.ndarray,\n known_positive_packed: np.ndarray | None,\n prepared: SequenceData,\n config: Config,\n item_correction: torch.Tensor,\n generator: torch.Generator,\n device: torch.device,\n) -> tuple[torch.Tensor, torch.Tensor]:\n if config.negative_filter_scope == \"full-training-history\":\n if known_positive_packed is None:\n raise RuntimeError(\"full-history negative filter was not built\")\n return draw_full_history_filtered_negatives(\n positive_items,\n user_rows,\n liked_items,\n known_positive_packed,\n len(prepared.item_ids),\n config,\n item_correction,\n generator,\n device,\n )\n return base.draw_filtered_mixed_negatives(\n positive_items,\n known_history,\n liked_items,\n len(prepared.item_ids),\n config.uniform_negatives,\n config.inbatch_negatives,\n item_correction,\n generator,\n device,\n )\n\n\ndef event_sequence(\n model: base.SequentialTwoTower,\n items: torch.Tensor,\n features: torch.Tensor,\n hidden: torch.Tensor,\n) -> tuple[torch.Tensor, torch.Tensor]:\n inputs = torch.cat([model.context_embedding(items), features], dim=-1)\n projected = model.event_projection(inputs)\n return model.sequence_encoder(projected, hidden)\n\n\ndef pool_explicit_states(\n model: base.SequentialTwoTower,\n prepared: SequenceData,\n state_ids: np.ndarray,\n device: torch.device,\n) -> tuple[torch.Tensor, torch.Tensor, torch.Tensor]:\n unique_states, inverse = np.unique(state_ids, return_inverse=True)\n liked_items = torch.from_numpy(\n prepared.liked_states[unique_states].astype(np.int64)\n ).to(device)\n disliked_items = torch.from_numpy(\n prepared.disliked_states[unique_states].astype(np.int64)\n ).to(device)\n liked_vectors = model._mean_context_channel(liked_items)\n disliked_vectors = model._mean_context_channel(disliked_items)\n inverse_rows = torch.from_numpy(inverse.astype(np.int64)).to(device)\n counts = prepared.state_counts[state_ids]\n return (\n liked_vectors[inverse_rows],\n disliked_vectors[inverse_rows],\n torch.from_numpy(counts.astype(np.float32)).to(device),\n )\n\n\ndef user_queries(\n model: base.SequentialTwoTower,\n sequence_vectors: torch.Tensor,\n liked_vectors: torch.Tensor,\n disliked_vectors: torch.Tensor,\n user_features: torch.Tensor,\n) -> torch.Tensor:\n return model.user_tower(\n torch.cat(\n [sequence_vectors, liked_vectors, disliked_vectors, user_features],\n dim=1,\n )\n )\n\n\ndef candidate_vectors(\n model: base.SequentialTwoTower,\n positives: torch.Tensor,\n negatives: torch.Tensor,\n) -> tuple[torch.Tensor, torch.Tensor]:\n all_items = torch.cat([positives, negatives.reshape(-1)])\n unique_items, inverse = torch.unique(all_items, return_inverse=True)\n encoded = model.encode_items(unique_items)\n positive_vectors = encoded[inverse[: len(positives)]]\n negative_vectors = encoded[inverse[len(positives) :]].reshape(\n len(positives), negatives.shape[1], -1\n )\n return positive_vectors, negative_vectors\n\n\ndef history_windows(\n sequence: np.ndarray,\n start: int,\n count: int,\n width: int,\n padding_item: int,\n) -> np.ndarray:\n base_start = max(0, start - width + 1)\n segment = sequence[base_start : start + count]\n padded = np.concatenate(\n [np.full(width - 1, padding_item, dtype=np.uint16), segment]\n )\n windows = np.lib.stride_tricks.sliding_window_view(padded, width)\n offset = start - base_start\n return windows[offset : offset + count].copy()\n\n\ndef corrected_negative_loss(\n logits: torch.Tensor,\n correction: torch.Tensor,\n config: Config,\n) -> torch.Tensor:\n raw = F.softplus(logits)\n total = config.uniform_negatives + config.inbatch_negatives\n result = torch.zeros(len(logits), device=logits.device)\n if config.uniform_negatives:\n result += config.uniform_negatives * raw[\n :, : config.uniform_negatives\n ].mean(dim=1)\n if config.inbatch_negatives:\n selected = slice(config.uniform_negatives, total)\n weights = correction[:, selected]\n result += config.inbatch_negatives * (\n (raw[:, selected] * weights).sum(dim=1)\n / weights.sum(dim=1).clamp_min(1.0e-6)\n )\n return result / total\n\n\ndef retained_target_window_starts(\n total_targets: np.ndarray,\n validation_counts: np.ndarray,\n training_counts: np.ndarray,\n) -> np.ndarray:\n \"\"\"Return the discarded prefix before the retained chronological suffix.\"\"\"\n training_region_ends = total_targets - validation_counts\n window_starts = training_region_ends - training_counts\n if (\n np.any(window_starts < 0)\n or np.any(training_counts < 0)\n or np.any(validation_counts < 0)\n ):\n raise RuntimeError(\"chronological target partition produced negative counts\")\n", "exit_code": 0, "duration": { "secs": 0, "nanos": 3950 }, "formatted_output": "/usr/local/bin/python\n/usr/local/bin/python3\nPython 3.12.13\n/usr/local/bin/python3\n['', '/usr/local/lib/python312.zip', '/usr/local/lib/python3.12', '/usr/local/lib/python3.12/lib-dynload', '/usr/local/lib/python3.12/site-packages']\n\n\ndef main() -> int:\n parser = argparse.ArgumentParser(description=__doc__)\n parser.add_argument(\n \"--stage\", choices=(\"validation\", \"submission\"), default=\"validation\"\n )\n parser.add_argument(\"--output\", type=Path, required=True)\n parser.add_argument(\"--public-dir\", type=Path, required=True)\n parser.add_argument(\"--prepared-cache\", type=Path)\n parser.add_argument(\"--device\", choices=(\"cpu\", \"mps\"), default=\"cpu\")\n parser.add_argument(\"--threads\", type=int, default=8)\n parser.add_argument(\"--bptt-steps\", type=int, default=Config.bptt_steps)\n parser.add_argument(\n \"--user-batch-size\", type=int, default=Config.user_batch_size\n )\n parser.add_argument(\"--epochs\", type=int, default=Config.epochs)\n parser.add_argument(\"--learning-rate\", type=float, default=Config.learning_rate)\n parser.add_argument(\n \"--loss-microbatch-size\",\n type=int,\n default=Config.loss_microbatch_size,\n )\n parser.add_argument(\n \"--negative-filter-scope\",\n choices=(\"full-training-history\", \"last-100\"),\n default=Config.negative_filter_scope,\n )\n parser.add_argument(\n \"--target-weighting\",\n choices=(\"discovery-graded\", \"organic-strong\", \"uniform\"),\n default=Config.target_weighting,\n )\n parser.add_argument(\n \"--ordinary-target-weight\",\n type=float,\n default=Config.ordinary_target_weight,\n )\n parser.add_argument(\n \"--organic-strong-target-weight\",\n type=float,\n default=Config.organic_strong_target_weight,\n )\n parser.add_argument(\n \"--organic-like-target-weight\",\n type=float,\n default=Config.organic_like_target_weight,\n )\n parser.add_argument(\n \"--discovery-horizon-days\",\n type=int,\n default=Config.discovery_horizon_days,\n )\n parser.add_argument(\n \"--validation-fraction\",\n type=float,\n default=Config.validation_fraction,\n )\n parser.add_argument(\n \"--max-train-targets-per-user\",\n type=int,\n default=Config.max_train_targets_per_user,\n help=\"retain this many recent pre-validation targets per user; 0 is uncapped\",\n )\n parser.add_argument(\n \"--max-validation-targets-per-user\",\n type=int,\n default=Config.max_validation_targets_per_user,\n help=\"retain this many final validation targets per user; 0 is uncapped\",\n )\n parser.add_argument(\n \"--early-stopping-patience\",\n type=int,\n default=Config.early_stopping_patience,\n )\n parser.add_argument(\n \"--early-stopping-min-delta\",\n type=float,\n default=Config.early_stopping_min_delta,\n )\n parser.add_argument(\"--checkpoint-dir\", type=Path)\n parser.add_argument(\"--resume-checkpoint\", type=Path)\n parser.add_argument(\"--seed\", type=int, default=Config.seed)\n parser.add_argument(\"--ranking-batch-size\", type=int, default=64)\n parser.add_argument(\"--prepare-only\", action=\"store_true\")\n args = parser.parse_args()\n\n if args.threads < 1 or args.bptt_steps < 2 or args.user_batch_size < 1:\n parser.error(\"threads, BPTT steps, and user batch size must be positive\")\n if (\n args.epochs < 1\n or args.learning_rate <= 0\n or args.loss_microbatch_size < 1\n or args.early_stopping_patience < 1\n or args.early_stopping_min_delta < 0\n or args.ordinary_target_weight <= 0\n or args.organic_strong_target_weight <= 0\n or args.organic_like_target_weight <= 0\n or args.discovery_horizon_days < 1\n or args.max_train_targets_per_user < 0\n or args.max_validation_targets_per_user < 0\n ):\n parser.error(\"training counts, learning rate, and patience are invalid\")\n if not 0.0 < args.validation_fraction < 1.0:\n parser.error(\"validation fraction must be strictly between zero and one\")\n public = args.public_dir.resolve()\n if not (public / \"data\" / \"candidate_catalog.parquet\").is_file():\n parser.error(f\"public task data not found under {public}\")\n config = Config(\n bptt_steps=args.bptt_steps,\n user_batch_size=args.user_batch_size,\n epochs=args.epochs,\n learning_rate=args.learning_rate,\n loss_microbatch_size=args.loss_microbatch_size,\n negative_filter_scope=args.negative_filter_scope,\n target_weighting=args.target_weighting,\n ordinary_target_weight=args.ordinary_target_weight,\n organic_strong_target_weight=args.organic_strong_target_weight,\n organic_like_target_weight=args.organic_like_target_weight,\n discovery_horizon_days=args.discovery_horizon_days,\n validation_fraction=args.validation_fraction,\n max_train_targets_per_user=args.max_train_targets_per_user,\n max_validation_targets_per_user=args.max_validation_targets_per_user,\n early_stopping_patience=args.early_stopping_patience,\n early_stopping_min_delta=args.early_stopping_min_delta,\n seed=args.seed,\n )\n torch.set_num_threads(args.threads)\n torch.set_num_interop_threads(1)\n seed_everything(config.seed)\n device = torch.device(args.device)\n if device.type == \"mps\" and not torch.backends.mps.is_available():\n parser.error(\"MPS was requested but is unavailable\")\n\n started = time.monotonic()\n prepared, eligibility = load_or_prepare(\n public,\n args.stage,\n config,\n args.prepared_cache.resolve() if args.prepared_cache else None,\n )\n target_partition = chronological_target_partition(\n prepared,\n config.validation_fraction,\n config.max_train_targets_per_user,\n config.max_validation_targets_per_user,\n )\n if args.prepare_only:\n print(\n json.dumps(\n {\n \"stage\": args.stage,\n \"sequence_users\": len(prepared.user_ids),\n \"sequence_tokens\": len(prepared.sequence_items),\n \"next_item_targets\": prepared.target_count,\n \"selected_training_targets\": int(\n target_partition.training_counts.sum()\n ),\n \"selected_validation_targets\": int(\n target_partition.validation_counts.sum()\n ),\n \"discarded_old_targets\": int(\n target_partition.window_starts.sum()\n ),\n \"target_users\": len(eligibility.uids),\n \"runtime_seconds\": round(time.monotonic() - started, 3),\n \"config\": asdict(config),\n },\n indent=2,\n )\n )\n return 0\n\n model, training_history = train_model(\n public,\n args.stage,\n prepared,\n config,\n device,\n args.checkpoint_dir.resolve() if args.checkpoint_dir else None,\n args.resume_checkpoint.resolve() if args.resume_checkpoint else None,\n )\n ranking, embedding_diagnostics = rank_candidates(\n model,\n prepared,\n eligibility,\n config,\n device,\n args.ranking_batch_size,\n )\n write_ranking(ranking, args.output.resolve())\n print(\n json.dumps(\n {\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": args.stage,\n \"output\": str(args.output.resolve()),\n \"rows\": len(ranking),\n \"users\": int(ranking.uid.nunique()),\n \"runtime_seconds\": round(time.monotonic() - started, 3),\n \"public_inputs_only\": True,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": (\n \"every-adjacent-target-within-recent-chronological-window\"\n ),\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": False,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": (\n \"24-uniform-plus-8-propensity-corrected-inbatch\"\n ),\n \"false_negative_filter\": config.negative_filter_scope,\n \"target_weighting\": config.target_weighting,\n },\n \"config\": asdict(config),\n \"sequence_tokens\": len(prepared.sequence_items),\n \"all_next_item_targets\": prepared.target_count,\n \"selected_training_targets\": int(\n target_partition.training_counts.sum()\n ),\n \"selected_validation_targets\": int(\n target_partition.validation_counts.sum()\n ),\n \"discarded_old_targets\": int(target_partition.window_starts.sum()),\n \"training_history\": training_history,\n \"embedding_diagnostics\": embedding_diagnostics,\n \"torch_version\": torch.__version__,\n \"device\": str(device),\n },\n indent=2,\n )\n )\n return 0\n\n\nif __name__ == \"__main__\":\n raise SystemExit(main())\n self.context_embedding.weight[n_items].zero_()\n\n def _mean_context_channel(self, items: torch.Tensor) -> torch.Tensor:\n mask = items.ne(self.n_items)\n vectors = self.context_embedding(items)\n return (vectors * mask.unsqueeze(-1)).sum(dim=1) / mask.sum(\n dim=1, keepdim=True\n ).clamp_min(1)\n\n def encode_items(self, items: torch.Tensor) -> torch.Tensor:\n inputs = torch.cat(\n [self.candidate_embedding(items), self.item_features[items]], dim=1\n )\n return self.item_tower(inputs)\n\n\ndef invalid_negative_mask(\n negatives: torch.Tensor,\n targets: torch.Tensor,\n context_items: torch.Tensor,\n liked_items: torch.Tensor,\n) -> torch.Tensor:\n \"\"\"Identify targets, known positives, active likes, and row duplicates.\"\"\"\n invalid = negatives.eq(targets[:, None])\n invalid |= negatives[:, :, None].eq(context_items[:, None, :]).any(dim=2)\n invalid |= negatives[:, :, None].eq(liked_items[:, None, :]).any(dim=2)\n for column in range(1, negatives.shape[1]):\n invalid[:, column] |= negatives[:, column, None].eq(\n negatives[:, :column]\n ).any(dim=1)\n return invalid\n\n\ndef draw_filtered_mixed_negatives(\n targets: torch.Tensor,\n context_items: torch.Tensor,\n liked_items: torch.Tensor,\n n_items: int,\n uniform_count: int,\n inbatch_count: int,\n item_correction: torch.Tensor,\n generator: torch.Generator,\n device: torch.device,\n) -> tuple[torch.Tensor, torch.Tensor]:\n \"\"\"Draw uniform and unique-target in-batch negatives.\"\"\"\n batch_size = len(targets)\n uniform = torch.randint(\n n_items,\n (batch_size, uniform_count),\n generator=generator,\n device=\"cpu\",\n )\n inbatch = torch.empty((batch_size, 0), dtype=torch.long, device=\"cpu\")\n corrected_count = 0\n if inbatch_count:\n unique_targets = torch.unique(targets.detach().cpu())\n corrected_count = min(inbatch_count, max(len(unique_targets) - 1, 0))\n if corrected_count:\n priorities = torch.rand(\n (batch_size, len(unique_targets)), generator=generator\n )\n priorities.masked_fill_(\n unique_targets[None, :].eq(targets.detach().cpu()[:, None]),\n -1.0,\n )\n columns = torch.topk(priorities, k=corrected_count, dim=1).indices\n inbatch = unique_targets[columns]\n if corrected_count < inbatch_count:\n filler = torch.randint(\n n_items,\n (batch_size, inbatch_count - corrected_count),\n generator=generator,\n device=\"cpu\",\n )\n inbatch = torch.cat([inbatch, filler], dim=1)\n\n negatives_cpu = torch.cat([uniform, inbatch], dim=1)\n correction_cpu = torch.ones_like(negatives_cpu, dtype=torch.float32)\n if corrected_count:\n correction_cpu[\n :, uniform_count : uniform_count + corrected_count\n ] = item_correction[inbatch[:, :corrected_count]]\n negatives = negatives_cpu.to(device)\n correction = correction_cpu.to(device)\n for _ in range(32):\n invalid = invalid_negative_mask(\n negatives, targets, context_items, liked_items\n )\n if not bool(invalid.any()):\n return negatives, correction\n replacements = torch.randint(\n n_items,\n (int(invalid.sum().detach().cpu()),),\n generator=generator,\n device=\"cpu\",\n ).to(device)\n negatives[invalid] = replacements\n correction[invalid] = 1.0\n invalid = invalid_negative_mask(\n negatives, targets, context_items, liked_items\n )\n if bool(invalid.any()):\n raise RuntimeError(\"mixed negative resampling failed false-negative filter\")\n return negatives, correction\n \"\"\"Estimate in-batch propensities from the selected training targets.\"\"\"\n counts = np.zeros(len(prepared.item_ids), dtype=np.float64)\n for user_row, count in enumerate(target_counts):\n if not count:\n continue\n offset = int(prepared.offsets[user_row])\n target_start = int(target_starts[user_row])\n counts += np.bincount(\n prepared.sequence_items[\n offset\n + target_start\n + 1 : offset\n + target_start\n + int(count)\n + 1\n ].astype(np.int64),\n minlength=len(prepared.item_ids),\n )\n total = float(counts.sum())\n probabilities = (counts + 1.0) / (total + len(counts))\n raw = np.power(\n (1.0 / len(counts)) / probabilities,\n config.inbatch_correction_power,\n )\n normalization = float(np.sum(counts * raw) / max(total, 1.0))\n correction = np.clip(\n raw / max(normalization, 1.0e-12),\n config.inbatch_correction_min,\n config.inbatch_correction_max,\n ).astype(np.float32)\n mean_on_targets = float(np.sum(counts * correction) / max(total, 1.0))\n log(\n f\"inbatch correction: min={correction.min():.3f} \"\n f\"mean_on_targets={mean_on_targets:.3f} max={correction.max():.3f}\"\n )\n return torch.from_numpy(correction)\n\n\ndef build_known_positive_filter(\n prepared: SequenceData, training_counts: np.ndarray\n) -> np.ndarray:\n \"\"\"Pack each user's complete public-training positive-item set.\"\"\"\n width = (len(prepared.item_ids) + 7) // 8\n packed = np.zeros((len(prepared.user_ids), width), dtype=np.uint8)\n retained = 0\n for user_row, target_count in enumerate(training_counts):\n if not target_count:\n continue\n offset = int(prepared.offsets[user_row])\n # T adjacent targets consume sequence positions 0 through T. The\n # chronological BCE suffix starts at T + 1 and is intentionally absent.\n items = np.unique(\n prepared.sequence_items[\n offset : offset + int(target_count) + 1\n ].astype(np.int64)\n )\n byte_columns = items >> 3\n bit_values = np.left_shift(\n np.uint8(1), (items & 7).astype(np.uint8)\n )\n np.bitwise_or.at(packed[user_row], byte_columns, bit_values)\n retained += len(items)\n log(\n f\"full-history false-negative filter: users={len(prepared.user_ids):,} \"\n f\"unique_user_items={retained:,} bytes={packed.nbytes:,}\"\n )\n return packed\n\n\ndef invalid_full_history_negatives(\n negatives: np.ndarray,\n targets: np.ndarray,\n user_rows: np.ndarray,\n known_positive_packed: np.ndarray,\n liked_items: np.ndarray,\n) -> np.ndarray:\n \"\"\"Return row-level invalid negatives using the complete training prefix.\"\"\"\n byte_columns = negatives >> 3\n bit_columns = negatives & 7\n known = known_positive_packed[user_rows[:, None], byte_columns]\n invalid = ((known >> bit_columns) & 1).astype(bool)\n invalid |= negatives == targets[:, None]\n invalid |= (negatives[:, :, None] == liked_items[:, None, :]).any(axis=2)\n for column in range(1, negatives.shape[1]):\n invalid[:, column] |= (\n negatives[:, column, None] == negatives[:, :column]\n ).any(axis=1)\n return invalid\n\n\ndef draw_full_history_filtered_negatives(\n targets: torch.Tensor,\n user_rows: np.ndarray,\n liked_items: torch.Tensor,\n known_positive_packed: np.ndarray,\n n_items: int,\n config: Config,\n item_correction: torch.Tensor,\n generator: torch.Generator,\n device: torch.device,\n) -> tuple[torch.Tensor, torch.Tensor]:\n \"\"\"Draw mixed negatives and reject all known public-training positives.\"\"\"\n targets_cpu = targets.detach().cpu().numpy().astype(np.int64, copy=False)\n liked_cpu = liked_items.detach().cpu().numpy().astype(np.int64, copy=False)\n batch_size = len(targets_cpu)\n uniform = torch.randint(\n n_items,\n (batch_size, config.uniform_negatives),\n generator=generator,\n device=\"cpu\",\n )\n inbatch = torch.empty((batch_size, 0), dtype=torch.long)\n corrected_count = 0\n if config.inbatch_negatives:\n unique_targets = torch.unique(targets.detach().cpu())\n corrected_count = min(\n config.inbatch_negatives, max(len(unique_targets) - 1, 0)\n )\n if corrected_count:\n priorities = torch.rand(\n (batch_size, len(unique_targets)), generator=generator\n )\n priorities.masked_fill_(\n unique_targets[None, :].eq(\n torch.from_numpy(targets_cpu)[:, None]\n ),\n -1.0,\n )\n columns = torch.topk(\n priorities, k=corrected_count, dim=1\n ).indices\n inbatch = unique_targets[columns]\n if corrected_count < config.inbatch_negatives:\n filler = torch.randint(\n n_items,\n (batch_size, config.inbatch_negatives - corrected_count),\n generator=generator,\n device=\"cpu\",\n )\n inbatch = torch.cat([inbatch, filler], dim=1)\n\n negatives = torch.cat([uniform, inbatch], dim=1).numpy()\n correction = np.ones_like(negatives, dtype=np.float32)\n if corrected_count:\n correction[\n :, config.uniform_negatives : config.uniform_negatives + corrected_count\n ] = item_correction[inbatch[:, :corrected_count]].numpy()\n for _ in range(32):\n invalid = invalid_full_history_negatives(\n negatives,\n targets_cpu,\n user_rows,\n known_positive_packed,\n liked_cpu,\n )\n if not np.any(invalid):\n return (\n torch.from_numpy(negatives).to(device),\n torch.from_numpy(correction).to(device),\n )\n replacements = torch.randint(\n n_items,\n (int(invalid.sum()),),\n generator=generator,\n device=\"cpu\",\n ).numpy()\n negatives[invalid] = replacements\n # Rejected in-batch items become ordinary uniform draws.\n correction[invalid] = 1.0\n invalid = invalid_full_history_negatives(\n negatives,\n targets_cpu,\n user_rows,\n known_positive_packed,\n liked_cpu,\n )\n if np.any(invalid):\n raise RuntimeError(\"full-history negative resampling failed\")\n return (\n torch.from_numpy(negatives).to(device),\n torch.from_numpy(correction).to(device),\n )\n\n\ndef draw_training_negatives(\n positive_items: torch.Tensor,\n known_history: torch.Tensor,\n liked_items: torch.Tensor,\n user_rows: np.ndarray,\n known_positive_packed: np.ndarray | None,\n prepared: SequenceData,\n config: Config,\n item_correction: torch.Tensor,\n generator: torch.Generator,\n device: torch.device,\n) -> tuple[torch.Tensor, torch.Tensor]:\n if config.negative_filter_scope == \"full-training-history\":\n if known_positive_packed is None:\n raise RuntimeError(\"full-history negative filter was not built\")\n return draw_full_history_filtered_negatives(\n positive_items,\n user_rows,\n liked_items,\n known_positive_packed,\n len(prepared.item_ids),\n config,\n item_correction,\n generator,\n device,\n )\n return base.draw_filtered_mixed_negatives(\n positive_items,\n known_history,\n liked_items,\n len(prepared.item_ids),\n config.uniform_negatives,\n config.inbatch_negatives,\n item_correction,\n generator,\n device,\n )\n\n\ndef event_sequence(\n model: base.SequentialTwoTower,\n items: torch.Tensor,\n features: torch.Tensor,\n hidden: torch.Tensor,\n) -> tuple[torch.Tensor, torch.Tensor]:\n inputs = torch.cat([model.context_embedding(items), features], dim=-1)\n projected = model.event_projection(inputs)\n return model.sequence_encoder(projected, hidden)\n\n\ndef pool_explicit_states(\n model: base.SequentialTwoTower,\n prepared: SequenceData,\n state_ids: np.ndarray,\n device: torch.device,\n) -> tuple[torch.Tensor, torch.Tensor, torch.Tensor]:\n unique_states, inverse = np.unique(state_ids, return_inverse=True)\n liked_items = torch.from_numpy(\n prepared.liked_states[unique_states].astype(np.int64)\n ).to(device)\n disliked_items = torch.from_numpy(\n prepared.disliked_states[unique_states].astype(np.int64)\n ).to(device)\n liked_vectors = model._mean_context_channel(liked_items)\n disliked_vectors = model._mean_context_channel(disliked_items)\n inverse_rows = torch.from_numpy(inverse.astype(np.int64)).to(device)\n counts = prepared.state_counts[state_ids]\n return (\n liked_vectors[inverse_rows],\n disliked_vectors[inverse_rows],\n torch.from_numpy(counts.astype(np.float32)).to(device),\n )\n\n\ndef user_queries(\n model: base.SequentialTwoTower,\n sequence_vectors: torch.Tensor,\n liked_vectors: torch.Tensor,\n disliked_vectors: torch.Tensor,\n user_features: torch.Tensor,\n) -> torch.Tensor:\n return model.user_tower(\n torch.cat(\n [sequence_vectors, liked_vectors, disliked_vectors, user_features],\n dim=1,\n )\n )\n\n\ndef candidate_vectors(\n model: base.SequentialTwoTower,\n positives: torch.Tensor,\n negatives: torch.Tensor,\n) -> tuple[torch.Tensor, torch.Tensor]:\n all_items = torch.cat([positives, negatives.reshape(-1)])\n unique_items, inverse = torch.unique(all_items, return_inverse=True)\n encoded = model.encode_items(unique_items)\n positive_vectors = encoded[inverse[: len(positives)]]\n negative_vectors = encoded[inverse[len(positives) :]].reshape(\n len(positives), negatives.shape[1], -1\n )\n return positive_vectors, negative_vectors\n\n\ndef history_windows(\n sequence: np.ndarray,\n start: int,\n count: int,\n width: int,\n padding_item: int,\n) -> np.ndarray:\n base_start = max(0, start - width + 1)\n segment = sequence[base_start : start + count]\n padded = np.concatenate(\n [np.full(width - 1, padding_item, dtype=np.uint16), segment]\n )\n windows = np.lib.stride_tricks.sliding_window_view(padded, width)\n offset = start - base_start\n return windows[offset : offset + count].copy()\n\n\ndef corrected_negative_loss(\n logits: torch.Tensor,\n correction: torch.Tensor,\n config: Config,\n) -> torch.Tensor:\n raw = F.softplus(logits)\n total = config.uniform_negatives + config.inbatch_negatives\n result = torch.zeros(len(logits), device=logits.device)\n if config.uniform_negatives:\n result += config.uniform_negatives * raw[\n :, : config.uniform_negatives\n ].mean(dim=1)\n if config.inbatch_negatives:\n selected = slice(config.uniform_negatives, total)\n weights = correction[:, selected]\n result += config.inbatch_negatives * (\n (raw[:, selected] * weights).sum(dim=1)\n / weights.sum(dim=1).clamp_min(1.0e-6)\n )\n return result / total\n\n\ndef retained_target_window_starts(\n total_targets: np.ndarray,\n validation_counts: np.ndarray,\n training_counts: np.ndarray,\n) -> np.ndarray:\n \"\"\"Return the discarded prefix before the retained chronological suffix.\"\"\"\n training_region_ends = total_targets - validation_counts\n window_starts = training_region_ends - training_counts\n if (\n np.any(window_starts < 0)\n or np.any(training_counts < 0)\n or np.any(validation_counts < 0)\n ):\n raise RuntimeError(\"chronological target partition produced negative counts\")\n" } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab447689da887d29385511a1bcef38c", "usage": { "input_tokens": 26647, "cached_input_tokens": 26240, "cache_write_input_tokens": 0, "output_tokens": 154, "reasoning_output_tokens": 21, "total_tokens": 26801 }, "turn_token_usage": { "input_tokens": 88942, "cached_input_tokens": 63232, "cache_write_input_tokens": 0, "output_tokens": 631, "reasoning_output_tokens": 98, "total_tokens": 89573 }, "thread_token_usage": { "input_tokens": 88942, "cached_input_tokens": 63232, "cache_write_input_tokens": 0, "output_tokens": 631, "reasoning_output_tokens": 98, "total_tokens": 89573 } } ## Step 11 · agent · 2026-09-23T21:41:05.386Z ### Thinking unavailable — no text recorded The default `python` on PATH is a bare interpreter without the supplied scientific stack, so I’m locating the task’s intended offline environment before spending experiment time. I’ve also confirmed the baseline’s main weakness candidate: most negatives are catalog-uniform, which overwhelmingly samples easy tail items, while the few in-batch negatives are only frequency-corrected and not selected for confusability. ### exec · 2026-09-23T21:41:12.265Z { "code": "const r = await tools.exec_command({cmd:\"find / -maxdepth 4 -type f \\\\( -name python -o -name python3 \\\\) 2>/dev/null | head -50; find / -maxdepth 4 -type d \\\\( -name 'site-packages' -o -name 'dist-packages' \\\\) 2>/dev/null; sed -n '1,200p' /task/requirements.txt; env | sort\",\"workdir\":\"/app\",\"yield_time_ms\":10000,\"max_output_tokens\":20000}); text(r.output)\n" } ### Tool output · 2026-09-23T21:41:12.369Z Script completed Wall time 0.1 seconds Output: # Exact distribution inventory for the Yambda two-tower task family. # # This is an input to `uv pip sync`, not a list of minimum requirements. A # conforming task environment contains exactly these third-party Python # distributions and no others. Python itself is pinned by task.toml and both # Harbor image Dockerfiles. attrs==26.1.0 bleach==6.4.0 certifi==2026.7.22 chardet==7.6.0 charset-normalizer==3.5.1 fastjsonschema==2.22.2 filelock==3.32.3 fsspec==2026.7.0 idna==3.18 Jinja2==3.1.6 joblib==1.5.3 jsonschema==4.26.0 jsonschema-specifications==2025.9.1 jupyter-core==5.9.1 jupytext==1.19.5 kaggle==2.2.4 kagglesdk==0.1.37 markdown-it-py==4.2.0 MarkupSafe==3.0.3 mdit-py-plugins==0.6.1 mdurl==0.1.2 mpmath==1.3.0 nbformat==5.11.1 networkx==3.6.1 numpy==2.2.6 packaging==26.3 pandas==2.3.3 pillow==12.3.0 pip==26.0.1 platformdirs==4.11.3 protobuf==7.35.1 pyarrow==18.1.0 python-dateutil==2.9.0.post0 python-dotenv==1.2.3 python-slugify==8.0.4 pytz==2026.3.post1 PyYAML==6.0.3 referencing==0.37.0 reportlab==4.2.5 requests==2.34.2 rpds-py==2026.6.3 scikit-learn==1.7.2 scipy==1.15.3 setuptools==84.0.0 six==1.17.0 sympy==1.14.0 text-unidecode==1.3 threadpoolctl==3.6.0 torch==2.8.0 tqdm==4.70.0 traitlets==5.16.1 typing-extensions==4.16.0 tzdata==2026.3 urllib3==2.7.0 webencodings==0.6.1 CODEX_CI=1 CODEX_HOME=/tmp/codex-home CODEX_SESSION_ID=01a0d036-9eed-7833-a524-c1393b61a2d9 CODEX_THREAD_ID=01a0d036-9eed-7833-a524-c1393b61a2d9 COLORTERM= GH_PAGER=cat GIT_PAGER=cat GPG_KEY=7169605F62C751356D054A26A821E680E5FA6305 HOME=/home/agent HOSTNAME=5b9281009e4b LANG=C.UTF-8 LC_ALL=C.UTF-8 LC_CTYPE=C.UTF-8 NO_COLOR=1 PAGER=cat PATH=/opt/codex-home/packages/standalone/releases/0.153.4-x86_64-unknown-linux-musl/codex-path:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games PWD=/app PYTHONDONTWRITEBYTECODE=1 PYTHONNOUSERSITE=1 PYTHON_SHA256=c08bc65a81971c1dd5783182826503369466c7e67374d1646519adf05207b684 PYTHON_VERSION=3.12.13 SHLVL=1 TERM=dumb _=/usr/local/bin/codex ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab4476f527c87d2bcc855b4a19d88bb", "usage": { "input_tokens": 32321, "cached_input_tokens": 26496, "cache_write_input_tokens": 0, "output_tokens": 244, "reasoning_output_tokens": 25, "total_tokens": 32565 }, "turn_token_usage": { "input_tokens": 121263, "cached_input_tokens": 89728, "cache_write_input_tokens": 0, "output_tokens": 875, "reasoning_output_tokens": 123, "total_tokens": 122138 }, "thread_token_usage": { "input_tokens": 121263, "cached_input_tokens": 89728, "cache_write_input_tokens": 0, "output_tokens": 875, "reasoning_output_tokens": 123, "total_tokens": 122138 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-59013b27-ea93-443e-9c38-7b6152341197", "process_id": "42079", "command": [ "/bin/sh", "-lc", "find / -maxdepth 4 -type f \\( -name python -o -name python3 \\) 2>/dev/null | head -50; find / -maxdepth 4 -type d \\( -name 'site-packages' -o -name 'dist-packages' \\) 2>/dev/null; sed -n '1,200p' /task/requirements.txt; env | sort" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "find / -maxdepth 4 -type f \\( -name python -o -name python3 \\) 2>/dev/null | head -50; find / -maxdepth 4 -type d \\( -name 'site-packages' -o -name 'dist-packages' \\) 2>/dev/null; sed -n '1,200p' /task/requirements.txt; env | sort" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "# Exact distribution inventory for the Yambda two-tower task family.\n#\n# This is an input to `uv pip sync`, not a list of minimum requirements. A\n# conforming task environment contains exactly these third-party Python\n# distributions and no others. Python itself is pinned by task.toml and both\n# Harbor image Dockerfiles.\nattrs==26.1.0\nbleach==6.4.0\ncertifi==2026.7.22\nchardet==7.6.0\ncharset-normalizer==3.5.1\nfastjsonschema==2.22.2\nfilelock==3.32.3\nfsspec==2026.7.0\nidna==3.18\nJinja2==3.1.6\njoblib==1.5.3\njsonschema==4.26.0\njsonschema-specifications==2025.9.1\njupyter-core==5.9.1\njupytext==1.19.5\nkaggle==2.2.4\nkagglesdk==0.1.37\nmarkdown-it-py==4.2.0\nMarkupSafe==3.0.3\nmdit-py-plugins==0.6.1\nmdurl==0.1.2\nmpmath==1.3.0\nnbformat==5.11.1\nnetworkx==3.6.1\nnumpy==2.2.6\npackaging==26.3\npandas==2.3.3\npillow==12.3.0\npip==26.0.1\nplatformdirs==4.11.3\nprotobuf==7.35.1\npyarrow==18.1.0\npython-dateutil==2.9.0.post0\npython-dotenv==1.2.3\npython-slugify==8.0.4\npytz==2026.3.post1\nPyYAML==6.0.3\nreferencing==0.37.0\nreportlab==4.2.5\nrequests==2.34.2\nrpds-py==2026.6.3\nscikit-learn==1.7.2\nscipy==1.15.3\nsetuptools==84.0.0\nsix==1.17.0\nsympy==1.14.0\ntext-unidecode==1.3\nthreadpoolctl==3.6.0\ntorch==2.8.0\ntqdm==4.70.0\ntraitlets==5.16.1\ntyping-extensions==4.16.0\ntzdata==2026.3\nurllib3==2.7.0\nwebencodings==0.6.1\nCODEX_CI=1\nCODEX_HOME=/tmp/codex-home\nCODEX_SESSION_ID=01a0d036-9eed-7833-a524-c1393b61a2d9\nCODEX_THREAD_ID=01a0d036-9eed-7833-a524-c1393b61a2d9\nCOLORTERM=\nGH_PAGER=cat\nGIT_PAGER=cat\nGPG_KEY=7169605F62C751356D054A26A821E680E5FA6305\nHOME=/home/agent\nHOSTNAME=5b9281009e4b\nLANG=C.UTF-8\nLC_ALL=C.UTF-8\nLC_CTYPE=C.UTF-8\nNO_COLOR=1\nPAGER=cat\nPATH=/opt/codex-home/packages/standalone/releases/0.153.4-x86_64-unknown-linux-musl/codex-path:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games\nPWD=/app\nPYTHONDONTWRITEBYTECODE=1\nPYTHONNOUSERSITE=1\nPYTHON_SHA256=c08bc65a81971c1dd5783182826503369466c7e67374d1646519adf05207b684\nPYTHON_VERSION=3.12.13\nSHLVL=1\nTERM=dumb\n_=/usr/local/bin/codex\n", "stderr": "", "aggregated_output": "# Exact distribution inventory for the Yambda two-tower task family.\n#\n# This is an input to `uv pip sync`, not a list of minimum requirements. A\n# conforming task environment contains exactly these third-party Python\n# distributions and no others. Python itself is pinned by task.toml and both\n# Harbor image Dockerfiles.\nattrs==26.1.0\nbleach==6.4.0\ncertifi==2026.7.22\nchardet==7.6.0\ncharset-normalizer==3.5.1\nfastjsonschema==2.22.2\nfilelock==3.32.3\nfsspec==2026.7.0\nidna==3.18\nJinja2==3.1.6\njoblib==1.5.3\njsonschema==4.26.0\njsonschema-specifications==2025.9.1\njupyter-core==5.9.1\njupytext==1.19.5\nkaggle==2.2.4\nkagglesdk==0.1.37\nmarkdown-it-py==4.2.0\nMarkupSafe==3.0.3\nmdit-py-plugins==0.6.1\nmdurl==0.1.2\nmpmath==1.3.0\nnbformat==5.11.1\nnetworkx==3.6.1\nnumpy==2.2.6\npackaging==26.3\npandas==2.3.3\npillow==12.3.0\npip==26.0.1\nplatformdirs==4.11.3\nprotobuf==7.35.1\npyarrow==18.1.0\npython-dateutil==2.9.0.post0\npython-dotenv==1.2.3\npython-slugify==8.0.4\npytz==2026.3.post1\nPyYAML==6.0.3\nreferencing==0.37.0\nreportlab==4.2.5\nrequests==2.34.2\nrpds-py==2026.6.3\nscikit-learn==1.7.2\nscipy==1.15.3\nsetuptools==84.0.0\nsix==1.17.0\nsympy==1.14.0\ntext-unidecode==1.3\nthreadpoolctl==3.6.0\ntorch==2.8.0\ntqdm==4.70.0\ntraitlets==5.16.1\ntyping-extensions==4.16.0\ntzdata==2026.3\nurllib3==2.7.0\nwebencodings==0.6.1\nCODEX_CI=1\nCODEX_HOME=/tmp/codex-home\nCODEX_SESSION_ID=01a0d036-9eed-7833-a524-c1393b61a2d9\nCODEX_THREAD_ID=01a0d036-9eed-7833-a524-c1393b61a2d9\nCOLORTERM=\nGH_PAGER=cat\nGIT_PAGER=cat\nGPG_KEY=7169605F62C751356D054A26A821E680E5FA6305\nHOME=/home/agent\nHOSTNAME=5b9281009e4b\nLANG=C.UTF-8\nLC_ALL=C.UTF-8\nLC_CTYPE=C.UTF-8\nNO_COLOR=1\nPAGER=cat\nPATH=/opt/codex-home/packages/standalone/releases/0.153.4-x86_64-unknown-linux-musl/codex-path:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games\nPWD=/app\nPYTHONDONTWRITEBYTECODE=1\nPYTHONNOUSERSITE=1\nPYTHON_SHA256=c08bc65a81971c1dd5783182826503369466c7e67374d1646519adf05207b684\nPYTHON_VERSION=3.12.13\nSHLVL=1\nTERM=dumb\n_=/usr/local/bin/codex\n", "exit_code": 0, "duration": { "secs": 0, "nanos": 3250 }, "formatted_output": "# Exact distribution inventory for the Yambda two-tower task family.\n#\n# This is an input to `uv pip sync`, not a list of minimum requirements. A\n# conforming task environment contains exactly these third-party Python\n# distributions and no others. Python itself is pinned by task.toml and both\n# Harbor image Dockerfiles.\nattrs==26.1.0\nbleach==6.4.0\ncertifi==2026.7.22\nchardet==7.6.0\ncharset-normalizer==3.5.1\nfastjsonschema==2.22.2\nfilelock==3.32.3\nfsspec==2026.7.0\nidna==3.18\nJinja2==3.1.6\njoblib==1.5.3\njsonschema==4.26.0\njsonschema-specifications==2025.9.1\njupyter-core==5.9.1\njupytext==1.19.5\nkaggle==2.2.4\nkagglesdk==0.1.37\nmarkdown-it-py==4.2.0\nMarkupSafe==3.0.3\nmdit-py-plugins==0.6.1\nmdurl==0.1.2\nmpmath==1.3.0\nnbformat==5.11.1\nnetworkx==3.6.1\nnumpy==2.2.6\npackaging==26.3\npandas==2.3.3\npillow==12.3.0\npip==26.0.1\nplatformdirs==4.11.3\nprotobuf==7.35.1\npyarrow==18.1.0\npython-dateutil==2.9.0.post0\npython-dotenv==1.2.3\npython-slugify==8.0.4\npytz==2026.3.post1\nPyYAML==6.0.3\nreferencing==0.37.0\nreportlab==4.2.5\nrequests==2.34.2\nrpds-py==2026.6.3\nscikit-learn==1.7.2\nscipy==1.15.3\nsetuptools==84.0.0\nsix==1.17.0\nsympy==1.14.0\ntext-unidecode==1.3\nthreadpoolctl==3.6.0\ntorch==2.8.0\ntqdm==4.70.0\ntraitlets==5.16.1\ntyping-extensions==4.16.0\ntzdata==2026.3\nurllib3==2.7.0\nwebencodings==0.6.1\nCODEX_CI=1\nCODEX_HOME=/tmp/codex-home\nCODEX_SESSION_ID=01a0d036-9eed-7833-a524-c1393b61a2d9\nCODEX_THREAD_ID=01a0d036-9eed-7833-a524-c1393b61a2d9\nCOLORTERM=\nGH_PAGER=cat\nGIT_PAGER=cat\nGPG_KEY=7169605F62C751356D054A26A821E680E5FA6305\nHOME=/home/agent\nHOSTNAME=5b9281009e4b\nLANG=C.UTF-8\nLC_ALL=C.UTF-8\nLC_CTYPE=C.UTF-8\nNO_COLOR=1\nPAGER=cat\nPATH=/opt/codex-home/packages/standalone/releases/0.153.4-x86_64-unknown-linux-musl/codex-path:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games\nPWD=/app\nPYTHONDONTWRITEBYTECODE=1\nPYTHONNOUSERSITE=1\nPYTHON_SHA256=c08bc65a81971c1dd5783182826503369466c7e67374d1646519adf05207b684\nPYTHON_VERSION=3.12.13\nSHLVL=1\nTERM=dumb\n_=/usr/local/bin/codex\n" } } ## Step 12 · agent · 2026-09-23T21:41:14.258Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:41:17.843Z { "code": "const r = await tools.exec_command({cmd:\"ls -la / /opt /usr/local/lib/python3.12/site-packages | head -100; find /opt /tmp /task -type f -name 'libtorch_cpu.so' -o -name 'numpy' 2>/dev/null | head -30; command -v uv || true; uv python list 2>/dev/null || true\",\"workdir\":\"/app\",\"yield_time_ms\":10000,\"max_output_tokens\":12000}); text(r.output)\n" } ### Tool output · 2026-09-23T21:41:17.993Z Script completed Wall time 0.1 seconds Output: /: total 80 drwxr-xr-x 1 root root 4096 Sep 23 21:40 . drwxr-xr-x 1 root root 4096 Sep 23 21:40 .. -rwxr-xr-x 1 root root 0 Sep 23 21:40 .dockerenv drwxr-xr-x 1 agent agent 4096 Sep 23 21:37 app lrwxrwxrwx 1 root root 7 Aug 3 00:00 bin -> usr/bin drwxr-xr-x 2 root root 4096 Jul 2 19:05 boot drwxr-xr-x 5 root root 340 Sep 23 21:40 dev drwxr-xr-x 1 root root 4096 Sep 23 21:40 etc drwxr-xr-x 1 root root 4096 Sep 23 21:37 home drwxr-xr-x 2 root root 4096 Sep 23 21:40 installed-agent lrwxrwxrwx 1 root root 7 Aug 3 00:00 lib -> usr/lib lrwxrwxrwx 1 root root 9 Aug 3 00:00 lib64 -> usr/lib64 drwxr-xr-x 5 root root 4096 Sep 23 21:40 logs drwxr-xr-x 2 root root 4096 Aug 3 00:00 media drwxr-xr-x 2 root root 4096 Aug 3 00:00 mnt drwxr-xr-x 1 root root 4096 Sep 23 21:37 opt dr-xr-xr-x 248 root root 0 Sep 23 21:40 proc drwx------ 1 root root 4096 Sep 23 21:37 root drwxr-xr-x 3 root root 4096 Aug 3 00:00 run lrwxrwxrwx 1 root root 8 Aug 3 00:00 sbin -> usr/sbin drwxr-xr-x 2 root root 4096 Aug 3 00:00 srv dr-xr-xr-x 13 root root 0 Sep 23 21:40 sys dr-xr-xr-x 1 root root 4096 Sep 23 21:37 task drwxrwxrwt 1 root root 4096 Sep 23 21:40 tmp drwxr-xr-x 1 root root 4096 Aug 3 00:00 usr drwxr-xr-x 1 root root 4096 Aug 3 00:00 var /opt: total 16 drwxr-xr-x 1 root root 4096 Sep 23 21:37 . drwxr-xr-x 1 root root 4096 Sep 23 21:40 .. drwxr-xr-x 4 root root 4096 Sep 23 21:37 codex-home dr-xr-xr-x 1 root root 4096 Sep 23 21:37 task-venv /usr/local/lib/python3.12/site-packages: total 20 drwxr-xr-x 4 root root 4096 Aug 5 01:13 . drwxr-xr-x 38 root root 4096 Aug 5 01:13 .. -rw-r--r-- 1 root root 119 Aug 5 01:13 README.txt drwxr-xr-x 5 root root 4096 Aug 5 01:13 pip drwxr-xr-x 2 root root 4096 Aug 5 01:13 pip-25.0.1.dist-info /opt/task-venv/lib/python3.12/site-packages/sklearn/externals/array_api_compat/numpy /opt/task-venv/lib/python3.12/site-packages/numpy /opt/task-venv/lib/python3.12/site-packages/numpy/_core/include/numpy /opt/task-venv/lib/python3.12/site-packages/pandas/compat/numpy /opt/task-venv/lib/python3.12/site-packages/scipy/_lib/array_api_compat/numpy /opt/task-venv/lib/python3.12/site-packages/torch/lib/libtorch_cpu.so ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44778b05c87d28e300241e8bf3f6c", "usage": { "input_tokens": 33484, "cached_input_tokens": 32128, "cache_write_input_tokens": 0, "output_tokens": 139, "reasoning_output_tokens": 18, "total_tokens": 33623 }, "turn_token_usage": { "input_tokens": 154747, "cached_input_tokens": 121856, "cache_write_input_tokens": 0, "output_tokens": 1014, "reasoning_output_tokens": 141, "total_tokens": 155761 }, "thread_token_usage": { "input_tokens": 154747, "cached_input_tokens": 121856, "cache_write_input_tokens": 0, "output_tokens": 1014, "reasoning_output_tokens": 141, "total_tokens": 155761 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-9a31eb9a-47cd-4163-ae54-36e30909b5bb", "process_id": "10814", "command": [ "/bin/sh", "-lc", "ls -la / /opt /usr/local/lib/python3.12/site-packages | head -100; find /opt /tmp /task -type f -name 'libtorch_cpu.so' -o -name 'numpy' 2>/dev/null | head -30; command -v uv || true; uv python list 2>/dev/null || true" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "ls -la / /opt /usr/local/lib/python3.12/site-packages | head -100; find /opt /tmp /task -type f -name 'libtorch_cpu.so' -o -name 'numpy' 2>/dev/null | head -30; command -v uv || true; uv python list 2>/dev/null || true" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "/:\ntotal 80\ndrwxr-xr-x 1 root root 4096 Sep 23 21:40 .\ndrwxr-xr-x 1 root root 4096 Sep 23 21:40 ..\n-rwxr-xr-x 1 root root 0 Sep 23 21:40 .dockerenv\ndrwxr-xr-x 1 agent agent 4096 Sep 23 21:37 app\nlrwxrwxrwx 1 root root 7 Aug 3 00:00 bin -> usr/bin\ndrwxr-xr-x 2 root root 4096 Jul 2 19:05 boot\ndrwxr-xr-x 5 root root 340 Sep 23 21:40 dev\ndrwxr-xr-x 1 root root 4096 Sep 23 21:40 etc\ndrwxr-xr-x 1 root root 4096 Sep 23 21:37 home\ndrwxr-xr-x 2 root root 4096 Sep 23 21:40 installed-agent\nlrwxrwxrwx 1 root root 7 Aug 3 00:00 lib -> usr/lib\nlrwxrwxrwx 1 root root 9 Aug 3 00:00 lib64 -> usr/lib64\ndrwxr-xr-x 5 root root 4096 Sep 23 21:40 logs\ndrwxr-xr-x 2 root root 4096 Aug 3 00:00 media\ndrwxr-xr-x 2 root root 4096 Aug 3 00:00 mnt\ndrwxr-xr-x 1 root root 4096 Sep 23 21:37 opt\ndr-xr-xr-x 248 root root 0 Sep 23 21:40 proc\ndrwx------ 1 root root 4096 Sep 23 21:37 root\ndrwxr-xr-x 3 root root 4096 Aug 3 00:00 run\nlrwxrwxrwx 1 root root 8 Aug 3 00:00 sbin -> usr/sbin\ndrwxr-xr-x 2 root root 4096 Aug 3 00:00 srv\ndr-xr-xr-x 13 root root 0 Sep 23 21:40 sys\ndr-xr-xr-x 1 root root 4096 Sep 23 21:37 task\ndrwxrwxrwt 1 root root 4096 Sep 23 21:40 tmp\ndrwxr-xr-x 1 root root 4096 Aug 3 00:00 usr\ndrwxr-xr-x 1 root root 4096 Aug 3 00:00 var\n\n/opt:\ntotal 16\ndrwxr-xr-x 1 root root 4096 Sep 23 21:37 .\ndrwxr-xr-x 1 root root 4096 Sep 23 21:40 ..\ndrwxr-xr-x 4 root root 4096 Sep 23 21:37 codex-home\ndr-xr-xr-x 1 root root 4096 Sep 23 21:37 task-venv\n\n/usr/local/lib/python3.12/site-packages:\ntotal 20\ndrwxr-xr-x 4 root root 4096 Aug 5 01:13 .\ndrwxr-xr-x 38 root root 4096 Aug 5 01:13 ..\n-rw-r--r-- 1 root root 119 Aug 5 01:13 README.txt\ndrwxr-xr-x 5 root root 4096 Aug 5 01:13 pip\ndrwxr-xr-x 2 root root 4096 Aug 5 01:13 pip-25.0.1.dist-info\n/opt/task-venv/lib/python3.12/site-packages/sklearn/externals/array_api_compat/numpy\n/opt/task-venv/lib/python3.12/site-packages/numpy\n/opt/task-venv/lib/python3.12/site-packages/numpy/_core/include/numpy\n/opt/task-venv/lib/python3.12/site-packages/pandas/compat/numpy\n/opt/task-venv/lib/python3.12/site-packages/scipy/_lib/array_api_compat/numpy\n/opt/task-venv/lib/python3.12/site-packages/torch/lib/libtorch_cpu.so\n", "stderr": "", "aggregated_output": "/:\ntotal 80\ndrwxr-xr-x 1 root root 4096 Sep 23 21:40 .\ndrwxr-xr-x 1 root root 4096 Sep 23 21:40 ..\n-rwxr-xr-x 1 root root 0 Sep 23 21:40 .dockerenv\ndrwxr-xr-x 1 agent agent 4096 Sep 23 21:37 app\nlrwxrwxrwx 1 root root 7 Aug 3 00:00 bin -> usr/bin\ndrwxr-xr-x 2 root root 4096 Jul 2 19:05 boot\ndrwxr-xr-x 5 root root 340 Sep 23 21:40 dev\ndrwxr-xr-x 1 root root 4096 Sep 23 21:40 etc\ndrwxr-xr-x 1 root root 4096 Sep 23 21:37 home\ndrwxr-xr-x 2 root root 4096 Sep 23 21:40 installed-agent\nlrwxrwxrwx 1 root root 7 Aug 3 00:00 lib -> usr/lib\nlrwxrwxrwx 1 root root 9 Aug 3 00:00 lib64 -> usr/lib64\ndrwxr-xr-x 5 root root 4096 Sep 23 21:40 logs\ndrwxr-xr-x 2 root root 4096 Aug 3 00:00 media\ndrwxr-xr-x 2 root root 4096 Aug 3 00:00 mnt\ndrwxr-xr-x 1 root root 4096 Sep 23 21:37 opt\ndr-xr-xr-x 248 root root 0 Sep 23 21:40 proc\ndrwx------ 1 root root 4096 Sep 23 21:37 root\ndrwxr-xr-x 3 root root 4096 Aug 3 00:00 run\nlrwxrwxrwx 1 root root 8 Aug 3 00:00 sbin -> usr/sbin\ndrwxr-xr-x 2 root root 4096 Aug 3 00:00 srv\ndr-xr-xr-x 13 root root 0 Sep 23 21:40 sys\ndr-xr-xr-x 1 root root 4096 Sep 23 21:37 task\ndrwxrwxrwt 1 root root 4096 Sep 23 21:40 tmp\ndrwxr-xr-x 1 root root 4096 Aug 3 00:00 usr\ndrwxr-xr-x 1 root root 4096 Aug 3 00:00 var\n\n/opt:\ntotal 16\ndrwxr-xr-x 1 root root 4096 Sep 23 21:37 .\ndrwxr-xr-x 1 root root 4096 Sep 23 21:40 ..\ndrwxr-xr-x 4 root root 4096 Sep 23 21:37 codex-home\ndr-xr-xr-x 1 root root 4096 Sep 23 21:37 task-venv\n\n/usr/local/lib/python3.12/site-packages:\ntotal 20\ndrwxr-xr-x 4 root root 4096 Aug 5 01:13 .\ndrwxr-xr-x 38 root root 4096 Aug 5 01:13 ..\n-rw-r--r-- 1 root root 119 Aug 5 01:13 README.txt\ndrwxr-xr-x 5 root root 4096 Aug 5 01:13 pip\ndrwxr-xr-x 2 root root 4096 Aug 5 01:13 pip-25.0.1.dist-info\n/opt/task-venv/lib/python3.12/site-packages/sklearn/externals/array_api_compat/numpy\n/opt/task-venv/lib/python3.12/site-packages/numpy\n/opt/task-venv/lib/python3.12/site-packages/numpy/_core/include/numpy\n/opt/task-venv/lib/python3.12/site-packages/pandas/compat/numpy\n/opt/task-venv/lib/python3.12/site-packages/scipy/_lib/array_api_compat/numpy\n/opt/task-venv/lib/python3.12/site-packages/torch/lib/libtorch_cpu.so\n", "exit_code": 0, "duration": { "secs": 0, "nanos": 2840 }, "formatted_output": "/:\ntotal 80\ndrwxr-xr-x 1 root root 4096 Sep 23 21:40 .\ndrwxr-xr-x 1 root root 4096 Sep 23 21:40 ..\n-rwxr-xr-x 1 root root 0 Sep 23 21:40 .dockerenv\ndrwxr-xr-x 1 agent agent 4096 Sep 23 21:37 app\nlrwxrwxrwx 1 root root 7 Aug 3 00:00 bin -> usr/bin\ndrwxr-xr-x 2 root root 4096 Jul 2 19:05 boot\ndrwxr-xr-x 5 root root 340 Sep 23 21:40 dev\ndrwxr-xr-x 1 root root 4096 Sep 23 21:40 etc\ndrwxr-xr-x 1 root root 4096 Sep 23 21:37 home\ndrwxr-xr-x 2 root root 4096 Sep 23 21:40 installed-agent\nlrwxrwxrwx 1 root root 7 Aug 3 00:00 lib -> usr/lib\nlrwxrwxrwx 1 root root 9 Aug 3 00:00 lib64 -> usr/lib64\ndrwxr-xr-x 5 root root 4096 Sep 23 21:40 logs\ndrwxr-xr-x 2 root root 4096 Aug 3 00:00 media\ndrwxr-xr-x 2 root root 4096 Aug 3 00:00 mnt\ndrwxr-xr-x 1 root root 4096 Sep 23 21:37 opt\ndr-xr-xr-x 248 root root 0 Sep 23 21:40 proc\ndrwx------ 1 root root 4096 Sep 23 21:37 root\ndrwxr-xr-x 3 root root 4096 Aug 3 00:00 run\nlrwxrwxrwx 1 root root 8 Aug 3 00:00 sbin -> usr/sbin\ndrwxr-xr-x 2 root root 4096 Aug 3 00:00 srv\ndr-xr-xr-x 13 root root 0 Sep 23 21:40 sys\ndr-xr-xr-x 1 root root 4096 Sep 23 21:37 task\ndrwxrwxrwt 1 root root 4096 Sep 23 21:40 tmp\ndrwxr-xr-x 1 root root 4096 Aug 3 00:00 usr\ndrwxr-xr-x 1 root root 4096 Aug 3 00:00 var\n\n/opt:\ntotal 16\ndrwxr-xr-x 1 root root 4096 Sep 23 21:37 .\ndrwxr-xr-x 1 root root 4096 Sep 23 21:40 ..\ndrwxr-xr-x 4 root root 4096 Sep 23 21:37 codex-home\ndr-xr-xr-x 1 root root 4096 Sep 23 21:37 task-venv\n\n/usr/local/lib/python3.12/site-packages:\ntotal 20\ndrwxr-xr-x 4 root root 4096 Aug 5 01:13 .\ndrwxr-xr-x 38 root root 4096 Aug 5 01:13 ..\n-rw-r--r-- 1 root root 119 Aug 5 01:13 README.txt\ndrwxr-xr-x 5 root root 4096 Aug 5 01:13 pip\ndrwxr-xr-x 2 root root 4096 Aug 5 01:13 pip-25.0.1.dist-info\n/opt/task-venv/lib/python3.12/site-packages/sklearn/externals/array_api_compat/numpy\n/opt/task-venv/lib/python3.12/site-packages/numpy\n/opt/task-venv/lib/python3.12/site-packages/numpy/_core/include/numpy\n/opt/task-venv/lib/python3.12/site-packages/pandas/compat/numpy\n/opt/task-venv/lib/python3.12/site-packages/scipy/_lib/array_api_compat/numpy\n/opt/task-venv/lib/python3.12/site-packages/torch/lib/libtorch_cpu.so\n" } } ## Step 13 · agent · 2026-09-23T21:41:20.635Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:41:23.435Z { "code": "const r = await tools.exec_command({cmd:\"/opt/task-venv/bin/python /app/solution/train_current_model.py --stage validation --public-dir /task --prepared-cache /app/solution/validation_cache.npz --output /app/solution/production_validation.parquet\",\"workdir\":\"/app/solution\",\"yield_time_ms\":1000,\"max_output_tokens\":12000}); text(JSON.stringify(r))\n" } ### Tool output · 2026-09-23T21:41:24.602Z Script completed Wall time 1.2 seconds Output: {"chunk_id":"33902d","wall_time_seconds":1.00088466,"session_id":50932,"original_token_count":0,"output":""} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab4477e2f0887d2bfa2bce5acffe9c1", "usage": { "input_tokens": 34691, "cached_input_tokens": 33280, "cache_write_input_tokens": 0, "output_tokens": 114, "reasoning_output_tokens": 17, "total_tokens": 34805 }, "turn_token_usage": { "input_tokens": 189438, "cached_input_tokens": 155136, "cache_write_input_tokens": 0, "output_tokens": 1128, "reasoning_output_tokens": 158, "total_tokens": 190566 }, "thread_token_usage": { "input_tokens": 189438, "cached_input_tokens": 155136, "cache_write_input_tokens": 0, "output_tokens": 1128, "reasoning_output_tokens": 158, "total_tokens": 190566 } } ## Step 14 · agent · 2026-09-23T21:41:31.831Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:41:33.291Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:50932,yield_time_ms:30000,max_output_tokens:12000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:42:03.301Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"29166d","wall_time_seconds":30.001674123,"session_id":50932,"original_token_count":113} loaded explicit events: rows=720,270 users=8,220 prepared users=1,000 tokens=2,090,746 states=35,727 elapsed=5.0s prepared users=2,000 tokens=4,301,266 states=71,242 elapsed=10.1s prepared users=3,000 tokens=6,486,146 states=109,471 elapsed=15.5s prepared users=4,000 tokens=8,793,043 states=148,210 elapsed=21.1s prepared users=5,000 tokens=10,992,205 states=182,596 elapsed=26.1s prepared users=6,000 tokens=13,061,727 states=217,148 elapsed=31.0s ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44784d5c487d28a8e97eba357cc68", "usage": { "input_tokens": 34862, "cached_input_tokens": 34560, "cache_write_input_tokens": 0, "output_tokens": 64, "reasoning_output_tokens": 11, "total_tokens": 34926 }, "turn_token_usage": { "input_tokens": 224300, "cached_input_tokens": 189696, "cache_write_input_tokens": 0, "output_tokens": 1192, "reasoning_output_tokens": 169, "total_tokens": 225492 }, "thread_token_usage": { "input_tokens": 224300, "cached_input_tokens": 189696, "cache_write_input_tokens": 0, "output_tokens": 1192, "reasoning_output_tokens": 169, "total_tokens": 225492 } } ## Step 15 · agent · 2026-09-23T21:42:37.964Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:42:38.452Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:50932,yield_time_ms:30000,max_output_tokens:12000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:43:08.470Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"98377f","wall_time_seconds":30.000552972,"session_id":50932,"original_token_count":197} prepared users=7,000 tokens=15,334,418 states=256,914 elapsed=36.8s prepared users=8,000 tokens=17,462,672 states=296,703 elapsed=42.3s prepared users=9,000 tokens=19,568,405 states=331,551 elapsed=47.3s target users without qualifying catalog sequence=7 prepared stage=validation sequence_users=9,135 tokens=20,056,329 next_item_targets=20,047,194 states=339,133 saved public-derived full-sequence cache: /app/solution/validation_cache.npz chronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194 inbatch correction: min=0.250 mean_on_targets=1.001 max=4.000 target weighting=organic-strong min=0.250 mean=0.575 max=1.000 full-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250 ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab447ab97d087d294b4005274b5139d", "usage": { "input_tokens": 35144, "cached_input_tokens": 34944, "cache_write_input_tokens": 0, "output_tokens": 70, "reasoning_output_tokens": 17, "total_tokens": 35214 }, "turn_token_usage": { "input_tokens": 259444, "cached_input_tokens": 224640, "cache_write_input_tokens": 0, "output_tokens": 1262, "reasoning_output_tokens": 186, "total_tokens": 260706 }, "thread_token_usage": { "input_tokens": 259444, "cached_input_tokens": 224640, "cache_write_input_tokens": 0, "output_tokens": 1262, "reasoning_output_tokens": 186, "total_tokens": 260706 } } ## Step 16 · agent · 2026-09-23T21:43:10.070Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:43:11.472Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:50932,yield_time_ms:30000,max_output_tokens:12000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:43:41.511Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"290de4","wall_time_seconds":30.001014526,"session_id":50932,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab447ecded487d29ec908ed6f7a812c", "usage": { "input_tokens": 35514, "cached_input_tokens": 34944, "cache_write_input_tokens": 0, "output_tokens": 59, "reasoning_output_tokens": 6, "total_tokens": 35573 }, "turn_token_usage": { "input_tokens": 294958, "cached_input_tokens": 259584, "cache_write_input_tokens": 0, "output_tokens": 1321, "reasoning_output_tokens": 192, "total_tokens": 296279 }, "thread_token_usage": { "input_tokens": 294958, "cached_input_tokens": 259584, "cache_write_input_tokens": 0, "output_tokens": 1321, "reasoning_output_tokens": 192, "total_tokens": 296279 } } ## Step 17 · agent · 2026-09-23T21:43:44.447Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:43:45.829Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:50932,yield_time_ms:30000,max_output_tokens:12000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:44:15.863Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"adf76b","wall_time_seconds":30.000581993,"session_id":50932,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab4480db8a487d28b9a19969d20c82d", "usage": { "input_tokens": 35626, "cached_input_tokens": 35328, "cache_write_input_tokens": 0, "output_tokens": 72, "reasoning_output_tokens": 19, "total_tokens": 35698 }, "turn_token_usage": { "input_tokens": 330584, "cached_input_tokens": 294912, "cache_write_input_tokens": 0, "output_tokens": 1393, "reasoning_output_tokens": 211, "total_tokens": 331977 }, "thread_token_usage": { "input_tokens": 330584, "cached_input_tokens": 294912, "cache_write_input_tokens": 0, "output_tokens": 1393, "reasoning_output_tokens": 211, "total_tokens": 331977 } } ## Step 18 · agent · 2026-09-23T21:44:17.554Z ### Thinking unavailable — no text recorded Baseline preparation found 9,135 sequence users and about 1.05M retained training targets; the existing sampler filters roughly 5.5M known user–item positives correctly. Training is now running. Once scored, I’ll use the cached preparation for fast, controlled sampler comparisons. ### exec · 2026-09-23T21:44:21.219Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:50932,yield_time_ms:30000,max_output_tokens:12000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:44:51.292Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"d564c0","wall_time_seconds":30.002491919,"session_id":50932,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44830268887d2a3791beb687bb2e9", "usage": { "input_tokens": 35752, "cached_input_tokens": 35456, "cache_write_input_tokens": 0, "output_tokens": 125, "reasoning_output_tokens": 7, "total_tokens": 35877 }, "turn_token_usage": { "input_tokens": 366336, "cached_input_tokens": 330368, "cache_write_input_tokens": 0, "output_tokens": 1518, "reasoning_output_tokens": 218, "total_tokens": 367854 }, "thread_token_usage": { "input_tokens": 366336, "cached_input_tokens": 330368, "cache_write_input_tokens": 0, "output_tokens": 1518, "reasoning_output_tokens": 218, "total_tokens": 367854 } } ### exec · 2026-09-23T21:44:54.279Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:50932,yield_time_ms:30000,max_output_tokens:12000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:45:24.291Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"828eb5","wall_time_seconds":30.00082096,"session_id":50932,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44853870c87d29ddd7260ee2f800d", "usage": { "input_tokens": 35931, "cached_input_tokens": 35584, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 35982 }, "turn_token_usage": { "input_tokens": 402267, "cached_input_tokens": 365952, "cache_write_input_tokens": 0, "output_tokens": 1569, "reasoning_output_tokens": 218, "total_tokens": 403836 }, "thread_token_usage": { "input_tokens": 402267, "cached_input_tokens": 365952, "cache_write_input_tokens": 0, "output_tokens": 1569, "reasoning_output_tokens": 218, "total_tokens": 403836 } } ## Step 19 · agent · 2026-09-23T21:45:28.816Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:45:31.074Z { "code": "const r = await tools.exec_command({cmd:\"ps -o pid,etime,pcpu,pmem,rss,vsz,stat,cmd -C python | head; ls -lh /app/solution\",\"workdir\":\"/app\",\"yield_time_ms\":10000,\"max_output_tokens\":3000}); text(r.output)\n" } ### Tool output · 2026-09-23T21:45:31.217Z Script completed Wall time 0.1 seconds Output: /bin/sh: 1: ps: not found total 511M -r--r--r-- 1 agent agent 79K Sep 23 21:40 train_current_model.py -r--r--r-- 1 agent agent 16K Sep 23 21:40 two_tower_model.py -rw-r--r-- 1 agent agent 511M Sep 23 21:42 validation_cache.npz ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab4487481a887d28ba7beff3617bb93", "usage": { "input_tokens": 36035, "cached_input_tokens": 35712, "cache_write_input_tokens": 0, "output_tokens": 130, "reasoning_output_tokens": 50, "total_tokens": 36165 }, "turn_token_usage": { "input_tokens": 438302, "cached_input_tokens": 401664, "cache_write_input_tokens": 0, "output_tokens": 1699, "reasoning_output_tokens": 268, "total_tokens": 440001 }, "thread_token_usage": { "input_tokens": 438302, "cached_input_tokens": 401664, "cache_write_input_tokens": 0, "output_tokens": 1699, "reasoning_output_tokens": 268, "total_tokens": 440001 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-9896161e-f2f0-466b-a7c1-13d60eccb1c7", "process_id": "30731", "command": [ "/bin/sh", "-lc", "ps -o pid,etime,pcpu,pmem,rss,vsz,stat,cmd -C python | head; ls -lh /app/solution" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "ps -o pid,etime,pcpu,pmem,rss,vsz,stat,cmd -C python | head; ls -lh /app/solution" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "/bin/sh: 1: ps: not found\ntotal 511M\n-r--r--r-- 1 agent agent 79K Sep 23 21:40 train_current_model.py\n-r--r--r-- 1 agent agent 16K Sep 23 21:40 two_tower_model.py\n-rw-r--r-- 1 agent agent 511M Sep 23 21:42 validation_cache.npz\n", "stderr": "", "aggregated_output": "/bin/sh: 1: ps: not found\ntotal 511M\n-r--r--r-- 1 agent agent 79K Sep 23 21:40 train_current_model.py\n-r--r--r-- 1 agent agent 16K Sep 23 21:40 two_tower_model.py\n-rw-r--r-- 1 agent agent 511M Sep 23 21:42 validation_cache.npz\n", "exit_code": 0, "duration": { "secs": 0, "nanos": 3170 }, "formatted_output": "/bin/sh: 1: ps: not found\ntotal 511M\n-r--r--r-- 1 agent agent 79K Sep 23 21:40 train_current_model.py\n-r--r--r-- 1 agent agent 16K Sep 23 21:40 two_tower_model.py\n-rw-r--r-- 1 agent agent 511M Sep 23 21:42 validation_cache.npz\n" } } ## Step 20 · agent · 2026-09-23T21:45:33.236Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:45:34.647Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:50932,yield_time_ms:30000,max_output_tokens:12000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:46:04.667Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"86188a","wall_time_seconds":30.002218581,"session_id":50932,"original_token_count":24} epoch=1/1 batches=250 targets=987,417 batch_bce=0.547529 running_bce=0.541614 elapsed=207.3s ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab4487b703087d2b49e29963cbcc0c3", "usage": { "input_tokens": 36282, "cached_input_tokens": 35840, "cache_write_input_tokens": 0, "output_tokens": 73, "reasoning_output_tokens": 20, "total_tokens": 36355 }, "turn_token_usage": { "input_tokens": 474584, "cached_input_tokens": 437504, "cache_write_input_tokens": 0, "output_tokens": 1772, "reasoning_output_tokens": 288, "total_tokens": 476356 }, "thread_token_usage": { "input_tokens": 474584, "cached_input_tokens": 437504, "cache_write_input_tokens": 0, "output_tokens": 1772, "reasoning_output_tokens": 288, "total_tokens": 476356 } } ## Step 21 · agent · 2026-09-23T21:46:07.086Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:46:08.454Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:50932,yield_time_ms:30000,max_output_tokens:12000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:46:38.511Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"3eb418","wall_time_seconds":30.001381868,"session_id":50932,"original_token_count":58} epoch=1/1 train_loss=0.53984 validation_loss=0.49664 pair_accuracy=0.755 train_targets=1,052,953 validation_targets=130,103 train_seconds=221.0 validation_seconds=17.0 restored best validation-BCE checkpoint: epoch=1 loss=0.496636 ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab4489cdf5487d29313a814cb40cd7b", "usage": { "input_tokens": 36444, "cached_input_tokens": 36096, "cache_write_input_tokens": 0, "output_tokens": 64, "reasoning_output_tokens": 11, "total_tokens": 36508 }, "turn_token_usage": { "input_tokens": 511028, "cached_input_tokens": 473600, "cache_write_input_tokens": 0, "output_tokens": 1836, "reasoning_output_tokens": 299, "total_tokens": 512864 }, "thread_token_usage": { "input_tokens": 511028, "cached_input_tokens": 473600, "cache_write_input_tokens": 0, "output_tokens": 1836, "reasoning_output_tokens": 299, "total_tokens": 512864 } } ## Step 22 · agent · 2026-09-23T21:46:39.917Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:46:41.315Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:50932,yield_time_ms:30000,max_output_tokens:12000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:47:11.348Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"4040b3","wall_time_seconds":30.000812145,"session_id":50932,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab448bec34c87d285cf97161be25081", "usage": { "input_tokens": 36631, "cached_input_tokens": 36224, "cache_write_input_tokens": 0, "output_tokens": 63, "reasoning_output_tokens": 10, "total_tokens": 36694 }, "turn_token_usage": { "input_tokens": 547659, "cached_input_tokens": 509824, "cache_write_input_tokens": 0, "output_tokens": 1899, "reasoning_output_tokens": 309, "total_tokens": 549558 }, "thread_token_usage": { "input_tokens": 547659, "cached_input_tokens": 509824, "cache_write_input_tokens": 0, "output_tokens": 1899, "reasoning_output_tokens": 309, "total_tokens": 549558 } } ### exec · 2026-09-23T21:47:14.027Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:50932,yield_time_ms:30000,max_output_tokens:12000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:47:44.052Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"4b4243","wall_time_seconds":30.001343457,"session_id":50932,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab448dfb17087d2946f30881362229e", "usage": { "input_tokens": 36748, "cached_input_tokens": 36480, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 36799 }, "turn_token_usage": { "input_tokens": 584407, "cached_input_tokens": 546304, "cache_write_input_tokens": 0, "output_tokens": 1950, "reasoning_output_tokens": 309, "total_tokens": 586357 }, "thread_token_usage": { "input_tokens": 584407, "cached_input_tokens": 546304, "cache_write_input_tokens": 0, "output_tokens": 1950, "reasoning_output_tokens": 309, "total_tokens": 586357 } } ## Step 23 · agent · 2026-09-23T21:47:45.620Z ### Thinking unavailable — no text recorded ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-4e31036d-394c-481e-b711-46f2bd55e045", "process_id": "50932", "command": [ "/bin/sh", "-lc", "/opt/task-venv/bin/python /app/solution/train_current_model.py --stage validation --public-dir /task --prepared-cache /app/solution/validation_cache.npz --output /app/solution/production_validation.parquet" ], "cwd": "file:///app/solution", "parsed_cmd": [ { "type": "unknown", "cmd": "/opt/task-venv/bin/python /app/solution/train_current_model.py --stage validation --public-dir /task --prepared-cache /app/solution/validation_cache.npz --output /app/solution/production_validation.parquet" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "loaded explicit events: rows=720,270 users=8,220\nprepared users=1,000 tokens=2,090,746 states=35,727 elapsed=5.0s\nprepared users=2,000 tokens=4,301,266 states=71,242 elapsed=10.1s\nprepared users=3,000 tokens=6,486,146 states=109,471 elapsed=15.5s\nprepared users=4,000 tokens=8,793,043 states=148,210 elapsed=21.1s\nprepared users=5,000 tokens=10,992,205 states=182,596 elapsed=26.1s\nprepared users=6,000 tokens=13,061,727 states=217,148 elapsed=31.0s\nprepared users=7,000 tokens=15,334,418 states=256,914 elapsed=36.8s\nprepared users=8,000 tokens=17,462,672 states=296,703 elapsed=42.3s\nprepared users=9,000 tokens=19,568,405 states=331,551 elapsed=47.3s\ntarget users without qualifying catalog sequence=7\nprepared stage=validation sequence_users=9,135 tokens=20,056,329 next_item_targets=20,047,194 states=339,133\nsaved public-derived full-sequence cache: /app/solution/validation_cache.npz\nchronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194\ninbatch correction: min=0.250 mean_on_targets=1.001 max=4.000\ntarget weighting=organic-strong min=0.250 mean=0.575 max=1.000\nfull-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250\nepoch=1/1 batches=250 targets=987,417 batch_bce=0.547529 running_bce=0.541614 elapsed=207.3s\nepoch=1/1 train_loss=0.53984 validation_loss=0.49664 pair_accuracy=0.755 train_targets=1,052,953 validation_targets=130,103 train_seconds=221.0 validation_seconds=17.0\nrestored best validation-BCE checkpoint: epoch=1 loss=0.496636\nranked users=1,024/8,456\nranked users=2,048/8,456\nranked users=3,072/8,456\nranked users=4,096/8,456\nranked users=5,120/8,456\nranked users=6,144/8,456\nranked users=7,168/8,456\nranked users=8,192/8,456\nranked users=8,456/8,456\n{\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": \"validation\",\n \"output\": \"/app/solution/production_validation.parquet\",\n \"rows\": 845600,\n \"users\": 8456,\n \"runtime_seconds\": 378.67,\n \"public_inputs_only\": true,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": \"every-adjacent-target-within-recent-chronological-window\",\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": false,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": \"24-uniform-plus-8-propensity-corrected-inbatch\",\n \"false_negative_filter\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\"\n },\n \"config\": {\n \"bptt_steps\": 100,\n \"user_batch_size\": 64,\n \"embedding_dim\": 192,\n \"hidden_dim\": 192,\n \"user_hidden_1\": 512,\n \"user_hidden_2\": 256,\n \"item_hidden_1\": 512,\n \"item_hidden_2\": 256,\n \"dropout\": 0.05,\n \"epochs\": 1,\n \"learning_rate\": 0.001,\n \"weight_decay\": 1e-05,\n \"gradient_clip\": 2.0,\n \"loss_microbatch_size\": 65536,\n \"uniform_negatives\": 24,\n \"inbatch_negatives\": 8,\n \"inbatch_correction_power\": 0.5,\n \"inbatch_correction_min\": 0.25,\n \"inbatch_correction_max\": 4.0,\n \"negative_filter_scope\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\",\n \"ordinary_target_weight\": 0.25,\n \"organic_strong_target_weight\": 1.0,\n \"organic_like_target_weight\": 3.0,\n \"discovery_horizon_days\": 7,\n \"validation_fraction\": 0.1,\n \"max_train_targets_per_user\": 128,\n \"max_validation_targets_per_user\": 16,\n \"early_stopping_patience\": 1,\n \"early_stopping_min_delta\": 0.0001,\n \"seed\": 29\n },\n \"sequence_tokens\": 20056329,\n \"all_next_item_targets\": 20047194,\n \"selected_training_targets\": 1052953,\n \"selected_validation_targets\": 130103,\n \"discarded_old_targets\": 18864138,\n \"training_history\": [\n {\n \"epoch\": 1.0,\n \"loss\": 0.5398380468459596,\n \"positive_logit\": 0.7427799640797255,\n \"negative_logit\": -0.6222247078408105,\n \"pair_accuracy\": 0.7547733315257186,\n \"targets\": 1052953.0,\n \"target_weight_sum\": 632551.0,\n \"batches\": 266.0,\n \"seconds\": 221.04575657100008,\n \"validation_loss\": 0.49663621697395743,\n \"validation_targets\": 130103.0,\n \"validation_target_weight_sum\": 78769.25,\n \"validation_seconds\": 17.00934999699996\n }\n ],\n \"embedding_diagnostics\": {\n \"query_norm_mean\": 1.603016972541809,\n \"query_norm_std\": 0.7697497606277466,\n \"item_norm_mean\": 1.7570278644561768,\n \"item_norm_std\": 0.8279485702514648\n },\n \"torch_version\": \"2.8.0+cpu\",\n \"device\": \"cpu\"\n}\n", "stderr": "", "aggregated_output": "loaded explicit events: rows=720,270 users=8,220\nprepared users=1,000 tokens=2,090,746 states=35,727 elapsed=5.0s\nprepared users=2,000 tokens=4,301,266 states=71,242 elapsed=10.1s\nprepared users=3,000 tokens=6,486,146 states=109,471 elapsed=15.5s\nprepared users=4,000 tokens=8,793,043 states=148,210 elapsed=21.1s\nprepared users=5,000 tokens=10,992,205 states=182,596 elapsed=26.1s\nprepared users=6,000 tokens=13,061,727 states=217,148 elapsed=31.0s\nprepared users=7,000 tokens=15,334,418 states=256,914 elapsed=36.8s\nprepared users=8,000 tokens=17,462,672 states=296,703 elapsed=42.3s\nprepared users=9,000 tokens=19,568,405 states=331,551 elapsed=47.3s\ntarget users without qualifying catalog sequence=7\nprepared stage=validation sequence_users=9,135 tokens=20,056,329 next_item_targets=20,047,194 states=339,133\nsaved public-derived full-sequence cache: /app/solution/validation_cache.npz\nchronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194\ninbatch correction: min=0.250 mean_on_targets=1.001 max=4.000\ntarget weighting=organic-strong min=0.250 mean=0.575 max=1.000\nfull-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250\nepoch=1/1 batches=250 targets=987,417 batch_bce=0.547529 running_bce=0.541614 elapsed=207.3s\nepoch=1/1 train_loss=0.53984 validation_loss=0.49664 pair_accuracy=0.755 train_targets=1,052,953 validation_targets=130,103 train_seconds=221.0 validation_seconds=17.0\nrestored best validation-BCE checkpoint: epoch=1 loss=0.496636\nranked users=1,024/8,456\nranked users=2,048/8,456\nranked users=3,072/8,456\nranked users=4,096/8,456\nranked users=5,120/8,456\nranked users=6,144/8,456\nranked users=7,168/8,456\nranked users=8,192/8,456\nranked users=8,456/8,456\n{\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": \"validation\",\n \"output\": \"/app/solution/production_validation.parquet\",\n \"rows\": 845600,\n \"users\": 8456,\n \"runtime_seconds\": 378.67,\n \"public_inputs_only\": true,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": \"every-adjacent-target-within-recent-chronological-window\",\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": false,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": \"24-uniform-plus-8-propensity-corrected-inbatch\",\n \"false_negative_filter\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\"\n },\n \"config\": {\n \"bptt_steps\": 100,\n \"user_batch_size\": 64,\n \"embedding_dim\": 192,\n \"hidden_dim\": 192,\n \"user_hidden_1\": 512,\n \"user_hidden_2\": 256,\n \"item_hidden_1\": 512,\n \"item_hidden_2\": 256,\n \"dropout\": 0.05,\n \"epochs\": 1,\n \"learning_rate\": 0.001,\n \"weight_decay\": 1e-05,\n \"gradient_clip\": 2.0,\n \"loss_microbatch_size\": 65536,\n \"uniform_negatives\": 24,\n \"inbatch_negatives\": 8,\n \"inbatch_correction_power\": 0.5,\n \"inbatch_correction_min\": 0.25,\n \"inbatch_correction_max\": 4.0,\n \"negative_filter_scope\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\",\n \"ordinary_target_weight\": 0.25,\n \"organic_strong_target_weight\": 1.0,\n \"organic_like_target_weight\": 3.0,\n \"discovery_horizon_days\": 7,\n \"validation_fraction\": 0.1,\n \"max_train_targets_per_user\": 128,\n \"max_validation_targets_per_user\": 16,\n \"early_stopping_patience\": 1,\n \"early_stopping_min_delta\": 0.0001,\n \"seed\": 29\n },\n \"sequence_tokens\": 20056329,\n \"all_next_item_targets\": 20047194,\n \"selected_training_targets\": 1052953,\n \"selected_validation_targets\": 130103,\n \"discarded_old_targets\": 18864138,\n \"training_history\": [\n {\n \"epoch\": 1.0,\n \"loss\": 0.5398380468459596,\n \"positive_logit\": 0.7427799640797255,\n \"negative_logit\": -0.6222247078408105,\n \"pair_accuracy\": 0.7547733315257186,\n \"targets\": 1052953.0,\n \"target_weight_sum\": 632551.0,\n \"batches\": 266.0,\n \"seconds\": 221.04575657100008,\n \"validation_loss\": 0.49663621697395743,\n \"validation_targets\": 130103.0,\n \"validation_target_weight_sum\": 78769.25,\n \"validation_seconds\": 17.00934999699996\n }\n ],\n \"embedding_diagnostics\": {\n \"query_norm_mean\": 1.603016972541809,\n \"query_norm_std\": 0.7697497606277466,\n \"item_norm_mean\": 1.7570278644561768,\n \"item_norm_std\": 0.8279485702514648\n },\n \"torch_version\": \"2.8.0+cpu\",\n \"device\": \"cpu\"\n}\n", "exit_code": 0, "duration": { "secs": 383, "nanos": 274803421 }, "formatted_output": "loaded explicit events: rows=720,270 users=8,220\nprepared users=1,000 tokens=2,090,746 states=35,727 elapsed=5.0s\nprepared users=2,000 tokens=4,301,266 states=71,242 elapsed=10.1s\nprepared users=3,000 tokens=6,486,146 states=109,471 elapsed=15.5s\nprepared users=4,000 tokens=8,793,043 states=148,210 elapsed=21.1s\nprepared users=5,000 tokens=10,992,205 states=182,596 elapsed=26.1s\nprepared users=6,000 tokens=13,061,727 states=217,148 elapsed=31.0s\nprepared users=7,000 tokens=15,334,418 states=256,914 elapsed=36.8s\nprepared users=8,000 tokens=17,462,672 states=296,703 elapsed=42.3s\nprepared users=9,000 tokens=19,568,405 states=331,551 elapsed=47.3s\ntarget users without qualifying catalog sequence=7\nprepared stage=validation sequence_users=9,135 tokens=20,056,329 next_item_targets=20,047,194 states=339,133\nsaved public-derived full-sequence cache: /app/solution/validation_cache.npz\nchronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194\ninbatch correction: min=0.250 mean_on_targets=1.001 max=4.000\ntarget weighting=organic-strong min=0.250 mean=0.575 max=1.000\nfull-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250\nepoch=1/1 batches=250 targets=987,417 batch_bce=0.547529 running_bce=0.541614 elapsed=207.3s\nepoch=1/1 train_loss=0.53984 validation_loss=0.49664 pair_accuracy=0.755 train_targets=1,052,953 validation_targets=130,103 train_seconds=221.0 validation_seconds=17.0\nrestored best validation-BCE checkpoint: epoch=1 loss=0.496636\nranked users=1,024/8,456\nranked users=2,048/8,456\nranked users=3,072/8,456\nranked users=4,096/8,456\nranked users=5,120/8,456\nranked users=6,144/8,456\nranked users=7,168/8,456\nranked users=8,192/8,456\nranked users=8,456/8,456\n{\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": \"validation\",\n \"output\": \"/app/solution/production_validation.parquet\",\n \"rows\": 845600,\n \"users\": 8456,\n \"runtime_seconds\": 378.67,\n \"public_inputs_only\": true,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": \"every-adjacent-target-within-recent-chronological-window\",\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": false,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": \"24-uniform-plus-8-propensity-corrected-inbatch\",\n \"false_negative_filter\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\"\n },\n \"config\": {\n \"bptt_steps\": 100,\n \"user_batch_size\": 64,\n \"embedding_dim\": 192,\n \"hidden_dim\": 192,\n \"user_hidden_1\": 512,\n \"user_hidden_2\": 256,\n \"item_hidden_1\": 512,\n \"item_hidden_2\": 256,\n \"dropout\": 0.05,\n \"epochs\": 1,\n \"learning_rate\": 0.001,\n \"weight_decay\": 1e-05,\n \"gradient_clip\": 2.0,\n \"loss_microbatch_size\": 65536,\n \"uniform_negatives\": 24,\n \"inbatch_negatives\": 8,\n \"inbatch_correction_power\": 0.5,\n \"inbatch_correction_min\": 0.25,\n \"inbatch_correction_max\": 4.0,\n \"negative_filter_scope\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\",\n \"ordinary_target_weight\": 0.25,\n \"organic_strong_target_weight\": 1.0,\n \"organic_like_target_weight\": 3.0,\n \"discovery_horizon_days\": 7,\n \"validation_fraction\": 0.1,\n \"max_train_targets_per_user\": 128,\n \"max_validation_targets_per_user\": 16,\n \"early_stopping_patience\": 1,\n \"early_stopping_min_delta\": 0.0001,\n \"seed\": 29\n },\n \"sequence_tokens\": 20056329,\n \"all_next_item_targets\": 20047194,\n \"selected_training_targets\": 1052953,\n \"selected_validation_targets\": 130103,\n \"discarded_old_targets\": 18864138,\n \"training_history\": [\n {\n \"epoch\": 1.0,\n \"loss\": 0.5398380468459596,\n \"positive_logit\": 0.7427799640797255,\n \"negative_logit\": -0.6222247078408105,\n \"pair_accuracy\": 0.7547733315257186,\n \"targets\": 1052953.0,\n \"target_weight_sum\": 632551.0,\n \"batches\": 266.0,\n \"seconds\": 221.04575657100008,\n \"validation_loss\": 0.49663621697395743,\n \"validation_targets\": 130103.0,\n \"validation_target_weight_sum\": 78769.25,\n \"validation_seconds\": 17.00934999699996\n }\n ],\n \"embedding_diagnostics\": {\n \"query_norm_mean\": 1.603016972541809,\n \"query_norm_std\": 0.7697497606277466,\n \"item_norm_mean\": 1.7570278644561768,\n \"item_norm_std\": 0.8279485702514648\n },\n \"torch_version\": \"2.8.0+cpu\",\n \"device\": \"cpu\"\n}\n" } } The baseline completed its single epoch in 221 seconds with validation BCE 0.4966 and pair accuracy 0.755. Ranking is the slower dense catalog pass; after its public NDCG is recorded, experiment turnaround should be roughly five minutes each using the prepared cache. ### exec · 2026-09-23T21:47:49.128Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:50932,yield_time_ms:30000,max_output_tokens:12000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:47:49.210Z Script completed Wall time 0.0 seconds Output: {"chunk_id":"dd1ee2","wall_time_seconds":0.00000215,"exit_code":0,"original_token_count":803} ranked users=1,024/8,456 ranked users=2,048/8,456 ranked users=3,072/8,456 ranked users=4,096/8,456 ranked users=5,120/8,456 ranked users=6,144/8,456 ranked users=7,168/8,456 ranked users=8,192/8,456 ranked users=8,456/8,456 { "baseline": "yambda-windowed-sequence-two-tower-base", "stage": "validation", "output": "/app/solution/production_validation.parquet", "rows": 845600, "users": 8456, "runtime_seconds": 378.67, "public_inputs_only": true, "architecture": { "family": "pure-windowed-sequence-two-tower", "sequence_training": "every-adjacent-target-within-recent-chronological-window", "sequence_encoder": "one-layer-GRU-dense-timestep-loss", "bptt_hidden_state": "carried-and-detached", "model_selection": "chronological-validation-BCE-early-stopping", "loss_execution": "gradient-accumulated-microbatches", "user_id_embedding": false, "user_mlp": "582-512-256-192", "item_mlp": "196-512-256-192", "normalization": "none", "score": "raw-dot-product", "objective": "sample-weighted-BCE-at-every-timestep", "negative_sampling": "24-uniform-plus-8-propensity-corrected-inbatch", "false_negative_filter": "full-training-history", "target_weighting": "organic-strong" }, "config": { "bptt_steps": 100, "user_batch_size": 64, "embedding_dim": 192, "hidden_dim": 192, "user_hidden_1": 512, "user_hidden_2": 256, "item_hidden_1": 512, "item_hidden_2": 256, "dropout": 0.05, "epochs": 1, "learning_rate": 0.001, "weight_decay": 1e-05, "gradient_clip": 2.0, "loss_microbatch_size": 65536, "uniform_negatives": 24, "inbatch_negatives": 8, "inbatch_correction_power": 0.5, "inbatch_correction_min": 0.25, "inbatch_correction_max": 4.0, "negative_filter_scope": "full-training-history", "target_weighting": "organic-strong", "ordinary_target_weight": 0.25, "organic_strong_target_weight": 1.0, "organic_like_target_weight": 3.0, "discovery_horizon_days": 7, "validation_fraction": 0.1, "max_train_targets_per_user": 128, "max_validation_targets_per_user": 16, "early_stopping_patience": 1, "early_stopping_min_delta": 0.0001, "seed": 29 }, "sequence_tokens": 20056329, "all_next_item_targets": 20047194, "selected_training_targets": 1052953, "selected_validation_targets": 130103, "discarded_old_targets": 18864138, "training_history": [ { "epoch": 1.0, "loss": 0.5398380468459596, "positive_logit": 0.7427799640797255, "negative_logit": -0.6222247078408105, "pair_accuracy": 0.7547733315257186, "targets": 1052953.0, "target_weight_sum": 632551.0, "batches": 266.0, "seconds": 221.04575657100008, "validation_loss": 0.49663621697395743, "validation_targets": 130103.0, "validation_target_weight_sum": 78769.25, "validation_seconds": 17.00934999699996 } ], "embedding_diagnostics": { "query_norm_mean": 1.603016972541809, "query_norm_std": 0.7697497606277466, "item_norm_mean": 1.7570278644561768, "item_norm_std": 0.8279485702514648 }, "torch_version": "2.8.0+cpu", "device": "cpu" } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44900682087d2a5d7b304edaeb5d0", "usage": { "input_tokens": 36853, "cached_input_tokens": 36608, "cache_write_input_tokens": 0, "output_tokens": 129, "reasoning_output_tokens": 13, "total_tokens": 36982 }, "turn_token_usage": { "input_tokens": 621260, "cached_input_tokens": 582912, "cache_write_input_tokens": 0, "output_tokens": 2079, "reasoning_output_tokens": 322, "total_tokens": 623339 }, "thread_token_usage": { "input_tokens": 621260, "cached_input_tokens": 582912, "cache_write_input_tokens": 0, "output_tokens": 2079, "reasoning_output_tokens": 322, "total_tokens": 623339 } } ### exec · 2026-09-23T21:47:52.348Z { "code": "const r = await tools.exec_command({cmd:\"/opt/task-venv/bin/python /task/evaluate_public.py /app/solution/production_validation.parquet\",\"workdir\":\"/app\",\"yield_time_ms\":30000,\"max_output_tokens\":3000}); text(r.output)\n" } ### Tool output · 2026-09-23T21:47:55.912Z Script completed Wall time 3.6 seconds Output: { "model": "/app/solution/production_validation.parquet", "scores": { "quality_ndcg@10": 0.02128, "quality_users": 4263 } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab449058ed487d29243e2a5e37a0662", "usage": { "input_tokens": 38095, "cached_input_tokens": 36736, "cache_write_input_tokens": 0, "output_tokens": 68, "reasoning_output_tokens": 0, "total_tokens": 38163 }, "turn_token_usage": { "input_tokens": 659355, "cached_input_tokens": 619648, "cache_write_input_tokens": 0, "output_tokens": 2147, "reasoning_output_tokens": 322, "total_tokens": 661502 }, "thread_token_usage": { "input_tokens": 659355, "cached_input_tokens": 619648, "cache_write_input_tokens": 0, "output_tokens": 2147, "reasoning_output_tokens": 322, "total_tokens": 661502 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-f4ba3161-5d98-4643-ab76-dda090aa5c84", "process_id": "29677", "command": [ "/bin/sh", "-lc", "/opt/task-venv/bin/python /task/evaluate_public.py /app/solution/production_validation.parquet" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "/opt/task-venv/bin/python /task/evaluate_public.py /app/solution/production_validation.parquet" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "{\n \"model\": \"/app/solution/production_validation.parquet\",\n \"scores\": {\n \"quality_ndcg@10\": 0.02128,\n \"quality_users\": 4263\n }\n}\n", "stderr": "", "aggregated_output": "{\n \"model\": \"/app/solution/production_validation.parquet\",\n \"scores\": {\n \"quality_ndcg@10\": 0.02128,\n \"quality_users\": 4263\n }\n}\n", "exit_code": 0, "duration": { "secs": 3, "nanos": 391891487 }, "formatted_output": "{\n \"model\": \"/app/solution/production_validation.parquet\",\n \"scores\": {\n \"quality_ndcg@10\": 0.02128,\n \"quality_users\": 4263\n }\n}\n" } } ## Step 24 · agent · 2026-09-23T21:48:04.488Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:48:08.795Z { "code": "const r = await tools.exec_command({cmd:\"/opt/task-venv/bin/python - <<'PY'\\nimport pandas as pd, numpy as np\\ncat=pd.read_parquet('/task/data/candidate_catalog.parquet'); print(cat.columns); print(cat.head()); print(cat.describe(percentiles=[.01,.1,.25,.5,.75,.9,.99]).to_string())\\nr=pd.read_parquet('/app/solution/production_validation.parquet'); print(r.dtypes, r.head())\\nPY\",\"workdir\":\"/app\",\"yield_time_ms\":30000,\"max_output_tokens\":12000}); text(r.output)\n" } ### Tool output · 2026-09-23T21:48:10.485Z Script completed Wall time 1.7 seconds Output: Index(['item_id', 'positive_listens', 'organic_positive_listens', 'popularity_rank'], dtype='object') item_id positive_listens organic_positive_listens popularity_rank 0 5862961 26615 20620 1 1 6901374 25536 17347 2 2 5635052 24691 17194 3 3 3542184 24075 17699 4 4 9378983 24036 18195 5 item_id positive_listens organic_positive_listens popularity_rank count 3.000000e+04 30000.000000 30000.000000 30000.000000 mean 4.698278e+06 668.544300 313.926433 15000.500000 std 2.700274e+06 1053.389553 636.039902 8660.398374 min 2.060000e+02 163.000000 0.000000 1.000000 1% 9.818346e+04 165.000000 6.000000 300.990000 10% 9.531995e+05 185.000000 49.000000 3000.900000 25% 2.382368e+06 228.000000 93.000000 7500.750000 50% 4.687992e+06 354.000000 162.000000 15000.500000 75% 7.040711e+06 669.250000 309.000000 22500.250000 90% 8.451686e+06 1367.000000 640.000000 27000.100000 99% 9.295649e+06 5052.160000 2548.080000 29700.010000 max 9.390294e+06 26615.000000 20620.000000 30000.000000 uid int64 item_id int64 rank int64 dtype: object uid item_id rank 0 100 6511826 1 1 100 3972057 2 2 100 2736766 3 3 100 4948220 4 4 100 5488609 5 ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab4490c1e8087d2b72b58baf789d5f8", "usage": { "input_tokens": 38232, "cached_input_tokens": 37888, "cache_write_input_tokens": 0, "output_tokens": 375, "reasoning_output_tokens": 232, "total_tokens": 38607 }, "turn_token_usage": { "input_tokens": 697587, "cached_input_tokens": 657536, "cache_write_input_tokens": 0, "output_tokens": 2522, "reasoning_output_tokens": 554, "total_tokens": 700109 }, "thread_token_usage": { "input_tokens": 697587, "cached_input_tokens": 657536, "cache_write_input_tokens": 0, "output_tokens": 2522, "reasoning_output_tokens": 554, "total_tokens": 700109 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-5ba1b6e6-15bf-4f98-be4f-651361941f78", "process_id": "94606", "command": [ "/bin/sh", "-lc", "/opt/task-venv/bin/python - <<'PY'\nimport pandas as pd, numpy as np\ncat=pd.read_parquet('/task/data/candidate_catalog.parquet'); print(cat.columns); print(cat.head()); print(cat.describe(percentiles=[.01,.1,.25,.5,.75,.9,.99]).to_string())\nr=pd.read_parquet('/app/solution/production_validation.parquet'); print(r.dtypes, r.head())\nPY" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "/opt/task-venv/bin/python - <<'PY'\nimport pandas as pd, numpy as np\ncat=pd.read_parquet('/task/data/candidate_catalog.parquet'); print(cat.columns); print(cat.head()); print(cat.describe(percentiles=[.01,.1,.25,.5,.75,.9,.99]).to_string())\nr=pd.read_parquet('/app/solution/production_validation.parquet'); print(r.dtypes, r.head())\nPY" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "Index(['item_id', 'positive_listens', 'organic_positive_listens',\n 'popularity_rank'],\n dtype='object')\n item_id positive_listens organic_positive_listens popularity_rank\n0 5862961 26615 20620 1\n1 6901374 25536 17347 2\n2 5635052 24691 17194 3\n3 3542184 24075 17699 4\n4 9378983 24036 18195 5\n item_id positive_listens organic_positive_listens popularity_rank\ncount 3.000000e+04 30000.000000 30000.000000 30000.000000\nmean 4.698278e+06 668.544300 313.926433 15000.500000\nstd 2.700274e+06 1053.389553 636.039902 8660.398374\nmin 2.060000e+02 163.000000 0.000000 1.000000\n1% 9.818346e+04 165.000000 6.000000 300.990000\n10% 9.531995e+05 185.000000 49.000000 3000.900000\n25% 2.382368e+06 228.000000 93.000000 7500.750000\n50% 4.687992e+06 354.000000 162.000000 15000.500000\n75% 7.040711e+06 669.250000 309.000000 22500.250000\n90% 8.451686e+06 1367.000000 640.000000 27000.100000\n99% 9.295649e+06 5052.160000 2548.080000 29700.010000\nmax 9.390294e+06 26615.000000 20620.000000 30000.000000\nuid int64\nitem_id int64\nrank int64\ndtype: object uid item_id rank\n0 100 6511826 1\n1 100 3972057 2\n2 100 2736766 3\n3 100 4948220 4\n4 100 5488609 5\n", "stderr": "", "aggregated_output": "Index(['item_id', 'positive_listens', 'organic_positive_listens',\n 'popularity_rank'],\n dtype='object')\n item_id positive_listens organic_positive_listens popularity_rank\n0 5862961 26615 20620 1\n1 6901374 25536 17347 2\n2 5635052 24691 17194 3\n3 3542184 24075 17699 4\n4 9378983 24036 18195 5\n item_id positive_listens organic_positive_listens popularity_rank\ncount 3.000000e+04 30000.000000 30000.000000 30000.000000\nmean 4.698278e+06 668.544300 313.926433 15000.500000\nstd 2.700274e+06 1053.389553 636.039902 8660.398374\nmin 2.060000e+02 163.000000 0.000000 1.000000\n1% 9.818346e+04 165.000000 6.000000 300.990000\n10% 9.531995e+05 185.000000 49.000000 3000.900000\n25% 2.382368e+06 228.000000 93.000000 7500.750000\n50% 4.687992e+06 354.000000 162.000000 15000.500000\n75% 7.040711e+06 669.250000 309.000000 22500.250000\n90% 8.451686e+06 1367.000000 640.000000 27000.100000\n99% 9.295649e+06 5052.160000 2548.080000 29700.010000\nmax 9.390294e+06 26615.000000 20620.000000 30000.000000\nuid int64\nitem_id int64\nrank int64\ndtype: object uid item_id rank\n0 100 6511826 1\n1 100 3972057 2\n2 100 2736766 3\n3 100 4948220 4\n4 100 5488609 5\n", "exit_code": 0, "duration": { "secs": 1, "nanos": 521137742 }, "formatted_output": "Index(['item_id', 'positive_listens', 'organic_positive_listens',\n 'popularity_rank'],\n dtype='object')\n item_id positive_listens organic_positive_listens popularity_rank\n0 5862961 26615 20620 1\n1 6901374 25536 17347 2\n2 5635052 24691 17194 3\n3 3542184 24075 17699 4\n4 9378983 24036 18195 5\n item_id positive_listens organic_positive_listens popularity_rank\ncount 3.000000e+04 30000.000000 30000.000000 30000.000000\nmean 4.698278e+06 668.544300 313.926433 15000.500000\nstd 2.700274e+06 1053.389553 636.039902 8660.398374\nmin 2.060000e+02 163.000000 0.000000 1.000000\n1% 9.818346e+04 165.000000 6.000000 300.990000\n10% 9.531995e+05 185.000000 49.000000 3000.900000\n25% 2.382368e+06 228.000000 93.000000 7500.750000\n50% 4.687992e+06 354.000000 162.000000 15000.500000\n75% 7.040711e+06 669.250000 309.000000 22500.250000\n90% 8.451686e+06 1367.000000 640.000000 27000.100000\n99% 9.295649e+06 5052.160000 2548.080000 29700.010000\nmax 9.390294e+06 26615.000000 20620.000000 30000.000000\nuid int64\nitem_id int64\nrank int64\ndtype: object uid item_id rank\n0 100 6511826 1\n1 100 3972057 2\n2 100 2736766 3\n3 100 4948220 4\n4 100 5488609 5\n" } } ## Step 25 · agent · 2026-09-23T21:48:15.853Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:48:39.273Z { "code": "const r = await tools.exec_command({cmd:\"PYTHONPATH=/task /opt/task-venv/bin/python - <<'PY'\\nimport numpy as np,pandas as pd\\nfrom pathlib import Path\\nfrom ranking_evaluation import CandidateSet, score_rankings\\nfrom evaluate_public import validation_truth\\nD=Path('/task/data'); cat=pd.read_parquet(D/'candidate_catalog.parquet'); cs=CandidateSet(D/'validation_eligible_candidates.npz'); targets=set(pd.read_parquet(D/'target_users.parquet').uid.astype(int)); truth=validation_truth(cs,targets)\\nidx={int(x):i for i,x in enumerate(cat.item_id)}\\nrels=np.array([idx[i] for g in truth.values() for i in g]); grades=np.array([v for g in truth.values() for v in g.values()])\\nprint('truth users/items',len(truth),len(rels),'grades',dict(zip(*np.unique(grades,return_counts=True))))\\nfor g in [1,3]:\\n x=rels[grades==g]; print('grade',g,'pop rank quantiles',np.quantile(cat.popularity_rank.to_numpy()[x],[0,.1,.25,.5,.75,.9,1]),'organic',np.quantile(cat.organic_positive_listens.to_numpy()[x],[0,.1,.5,.9,1]))\\n# Use raw NPZ aligned API internals easier\\nz=np.load(D/'validation_eligible_candidates.npz'); u=z['uids']; items=z['item_ids']; packed=z['packed_eligible']; assert np.array_equal(items,cat.item_id)\\nfeatures={\\n'pop':-cat.popularity_rank.to_numpy(),\\n'positive':cat.positive_listens.to_numpy(),\\n'organic':cat.organic_positive_listens.to_numpy(),\\n'orgfrac':cat.organic_positive_listens.to_numpy()/cat.positive_listens.to_numpy(),\\n'org_sqrtpop':cat.organic_positive_listens.to_numpy()/np.sqrt(cat.positive_listens.to_numpy()),\\n}\\nfor name,score in features.items():\\n order=np.argsort(-score,kind='stable'); ranked={}\\n for row,uid in enumerate(u):\\n mask=np.unpackbits(packed[row],count=len(items),bitorder='little').astype(bool)\\n top=order[mask[order]][:100]; ranked[int(uid)]=items[top].tolist()\\n print(name,score_rankings(ranked,truth))\\n# oracle headroom and baseline rank stats\\nr=pd.read_parquet('/app/solution/production_validation.parquet').sort_values(['uid','rank']); ranked={int(uid):g.item_id.tolist() for uid,g in r.groupby('uid',sort=False)}\\nprint('baseline',score_rankings(ranked,truth))\\nhits=[]\\nfor uid,g in truth.items():\\n inv={x:k+1 for k,x in enumerate(ranked[uid])}\\n for i,grade in g.items(): hits.append((inv.get(i,999),grade,cat.loc[idx[i],'popularity_rank']))\\nprint('baseline hit<=',[(k,sum(1 for a,_,_ in hits if a<=k)) for k in [1,10,100]],'relevant',len(hits))\\nPY\",\"workdir\":\"/app\",\"yield_time_ms\":30000,\"max_output_tokens\":10000}); text(r.output)\n" } ### Tool output · 2026-09-23T21:48:45.607Z Script completed Wall time 6.3 seconds Output: truth users/items 4263 37769 grades {np.int64(1): np.int64(33352), np.int64(3): np.int64(4417)} grade 1 pop rank quantiles [1.00000e+00 4.08000e+02 1.69375e+03 5.54500e+03 1.32740e+04 2.16560e+04 3.00000e+04] organic [ 0. 109. 444. 2302. 20620.] grade 3 pop rank quantiles [2.00000e+00 6.18000e+02 2.10700e+03 6.37100e+03 1.41810e+04 2.18018e+04 2.99890e+04] organic [1.7000e+01 1.1560e+02 4.1700e+02 1.8740e+03 1.8195e+04] pop {'quality_ndcg@10': 0.01071, 'quality_users': 4263} positive {'quality_ndcg@10': 0.01071, 'quality_users': 4263} organic {'quality_ndcg@10': 3.2e-05, 'quality_users': 4263} orgfrac {'quality_ndcg@10': 0.000347, 'quality_users': 4263} org_sqrtpop {'quality_ndcg@10': 0.010206, 'quality_users': 4263} baseline {'quality_ndcg@10': 0.02128, 'quality_users': 4263} baseline hit<= [(1, 114), (10, 644), (100, 2619)] relevant 37769 ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab4491aba3487d2bb670fe97e164d78", "usage": { "input_tokens": 39244, "cached_input_tokens": 38016, "cache_write_input_tokens": 0, "output_tokens": 870, "reasoning_output_tokens": 129, "total_tokens": 40114 }, "turn_token_usage": { "input_tokens": 736831, "cached_input_tokens": 695552, "cache_write_input_tokens": 0, "output_tokens": 3392, "reasoning_output_tokens": 683, "total_tokens": 740223 }, "thread_token_usage": { "input_tokens": 736831, "cached_input_tokens": 695552, "cache_write_input_tokens": 0, "output_tokens": 3392, "reasoning_output_tokens": 683, "total_tokens": 740223 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-88074d1e-f9c3-40d4-b19a-524672adc41d", "process_id": "85053", "command": [ "/bin/sh", "-lc", "PYTHONPATH=/task /opt/task-venv/bin/python - <<'PY'\nimport numpy as np,pandas as pd\nfrom pathlib import Path\nfrom ranking_evaluation import CandidateSet, score_rankings\nfrom evaluate_public import validation_truth\nD=Path('/task/data'); cat=pd.read_parquet(D/'candidate_catalog.parquet'); cs=CandidateSet(D/'validation_eligible_candidates.npz'); targets=set(pd.read_parquet(D/'target_users.parquet').uid.astype(int)); truth=validation_truth(cs,targets)\nidx={int(x):i for i,x in enumerate(cat.item_id)}\nrels=np.array([idx[i] for g in truth.values() for i in g]); grades=np.array([v for g in truth.values() for v in g.values()])\nprint('truth users/items',len(truth),len(rels),'grades',dict(zip(*np.unique(grades,return_counts=True))))\nfor g in [1,3]:\n x=rels[grades==g]; print('grade',g,'pop rank quantiles',np.quantile(cat.popularity_rank.to_numpy()[x],[0,.1,.25,.5,.75,.9,1]),'organic',np.quantile(cat.organic_positive_listens.to_numpy()[x],[0,.1,.5,.9,1]))\n# Use raw NPZ aligned API internals easier\nz=np.load(D/'validation_eligible_candidates.npz'); u=z['uids']; items=z['item_ids']; packed=z['packed_eligible']; assert np.array_equal(items,cat.item_id)\nfeatures={\n'pop':-cat.popularity_rank.to_numpy(),\n'positive':cat.positive_listens.to_numpy(),\n'organic':cat.organic_positive_listens.to_numpy(),\n'orgfrac':cat.organic_positive_listens.to_numpy()/cat.positive_listens.to_numpy(),\n'org_sqrtpop':cat.organic_positive_listens.to_numpy()/np.sqrt(cat.positive_listens.to_numpy()),\n}\nfor name,score in features.items():\n order=np.argsort(-score,kind='stable'); ranked={}\n for row,uid in enumerate(u):\n mask=np.unpackbits(packed[row],count=len(items),bitorder='little').astype(bool)\n top=order[mask[order]][:100]; ranked[int(uid)]=items[top].tolist()\n print(name,score_rankings(ranked,truth))\n# oracle headroom and baseline rank stats\nr=pd.read_parquet('/app/solution/production_validation.parquet').sort_values(['uid','rank']); ranked={int(uid):g.item_id.tolist() for uid,g in r.groupby('uid',sort=False)}\nprint('baseline',score_rankings(ranked,truth))\nhits=[]\nfor uid,g in truth.items():\n inv={x:k+1 for k,x in enumerate(ranked[uid])}\n for i,grade in g.items(): hits.append((inv.get(i,999),grade,cat.loc[idx[i],'popularity_rank']))\nprint('baseline hit<=',[(k,sum(1 for a,_,_ in hits if a<=k)) for k in [1,10,100]],'relevant',len(hits))\nPY" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "PYTHONPATH=/task /opt/task-venv/bin/python - <<'PY'\nimport numpy as np,pandas as pd\nfrom pathlib import Path\nfrom ranking_evaluation import CandidateSet, score_rankings\nfrom evaluate_public import validation_truth\nD=Path('/task/data'); cat=pd.read_parquet(D/'candidate_catalog.parquet'); cs=CandidateSet(D/'validation_eligible_candidates.npz'); targets=set(pd.read_parquet(D/'target_users.parquet').uid.astype(int)); truth=validation_truth(cs,targets)\nidx={int(x):i for i,x in enumerate(cat.item_id)}\nrels=np.array([idx[i] for g in truth.values() for i in g]); grades=np.array([v for g in truth.values() for v in g.values()])\nprint('truth users/items',len(truth),len(rels),'grades',dict(zip(*np.unique(grades,return_counts=True))))\nfor g in [1,3]:\n x=rels[grades==g]; print('grade',g,'pop rank quantiles',np.quantile(cat.popularity_rank.to_numpy()[x],[0,.1,.25,.5,.75,.9,1]),'organic',np.quantile(cat.organic_positive_listens.to_numpy()[x],[0,.1,.5,.9,1]))\n# Use raw NPZ aligned API internals easier\nz=np.load(D/'validation_eligible_candidates.npz'); u=z['uids']; items=z['item_ids']; packed=z['packed_eligible']; assert np.array_equal(items,cat.item_id)\nfeatures={\n'pop':-cat.popularity_rank.to_numpy(),\n'positive':cat.positive_listens.to_numpy(),\n'organic':cat.organic_positive_listens.to_numpy(),\n'orgfrac':cat.organic_positive_listens.to_numpy()/cat.positive_listens.to_numpy(),\n'org_sqrtpop':cat.organic_positive_listens.to_numpy()/np.sqrt(cat.positive_listens.to_numpy()),\n}\nfor name,score in features.items():\n order=np.argsort(-score,kind='stable'); ranked={}\n for row,uid in enumerate(u):\n mask=np.unpackbits(packed[row],count=len(items),bitorder='little').astype(bool)\n top=order[mask[order]][:100]; ranked[int(uid)]=items[top].tolist()\n print(name,score_rankings(ranked,truth))\n# oracle headroom and baseline rank stats\nr=pd.read_parquet('/app/solution/production_validation.parquet').sort_values(['uid','rank']); ranked={int(uid):g.item_id.tolist() for uid,g in r.groupby('uid',sort=False)}\nprint('baseline',score_rankings(ranked,truth))\nhits=[]\nfor uid,g in truth.items():\n inv={x:k+1 for k,x in enumerate(ranked[uid])}\n for i,grade in g.items(): hits.append((inv.get(i,999),grade,cat.loc[idx[i],'popularity_rank']))\nprint('baseline hit<=',[(k,sum(1 for a,_,_ in hits if a<=k)) for k in [1,10,100]],'relevant',len(hits))\nPY" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "truth users/items 4263 37769 grades {np.int64(1): np.int64(33352), np.int64(3): np.int64(4417)}\ngrade 1 pop rank quantiles [1.00000e+00 4.08000e+02 1.69375e+03 5.54500e+03 1.32740e+04 2.16560e+04\n 3.00000e+04] organic [ 0. 109. 444. 2302. 20620.]\ngrade 3 pop rank quantiles [2.00000e+00 6.18000e+02 2.10700e+03 6.37100e+03 1.41810e+04 2.18018e+04\n 2.99890e+04] organic [1.7000e+01 1.1560e+02 4.1700e+02 1.8740e+03 1.8195e+04]\npop {'quality_ndcg@10': 0.01071, 'quality_users': 4263}\npositive {'quality_ndcg@10': 0.01071, 'quality_users': 4263}\norganic {'quality_ndcg@10': 3.2e-05, 'quality_users': 4263}\norgfrac {'quality_ndcg@10': 0.000347, 'quality_users': 4263}\norg_sqrtpop {'quality_ndcg@10': 0.010206, 'quality_users': 4263}\nbaseline {'quality_ndcg@10': 0.02128, 'quality_users': 4263}\nbaseline hit<= [(1, 114), (10, 644), (100, 2619)] relevant 37769\n", "stderr": "", "aggregated_output": "truth users/items 4263 37769 grades {np.int64(1): np.int64(33352), np.int64(3): np.int64(4417)}\ngrade 1 pop rank quantiles [1.00000e+00 4.08000e+02 1.69375e+03 5.54500e+03 1.32740e+04 2.16560e+04\n 3.00000e+04] organic [ 0. 109. 444. 2302. 20620.]\ngrade 3 pop rank quantiles [2.00000e+00 6.18000e+02 2.10700e+03 6.37100e+03 1.41810e+04 2.18018e+04\n 2.99890e+04] organic [1.7000e+01 1.1560e+02 4.1700e+02 1.8740e+03 1.8195e+04]\npop {'quality_ndcg@10': 0.01071, 'quality_users': 4263}\npositive {'quality_ndcg@10': 0.01071, 'quality_users': 4263}\norganic {'quality_ndcg@10': 3.2e-05, 'quality_users': 4263}\norgfrac {'quality_ndcg@10': 0.000347, 'quality_users': 4263}\norg_sqrtpop {'quality_ndcg@10': 0.010206, 'quality_users': 4263}\nbaseline {'quality_ndcg@10': 0.02128, 'quality_users': 4263}\nbaseline hit<= [(1, 114), (10, 644), (100, 2619)] relevant 37769\n", "exit_code": 0, "duration": { "secs": 6, "nanos": 164989993 }, "formatted_output": "truth users/items 4263 37769 grades {np.int64(1): np.int64(33352), np.int64(3): np.int64(4417)}\ngrade 1 pop rank quantiles [1.00000e+00 4.08000e+02 1.69375e+03 5.54500e+03 1.32740e+04 2.16560e+04\n 3.00000e+04] organic [ 0. 109. 444. 2302. 20620.]\ngrade 3 pop rank quantiles [2.00000e+00 6.18000e+02 2.10700e+03 6.37100e+03 1.41810e+04 2.18018e+04\n 2.99890e+04] organic [1.7000e+01 1.1560e+02 4.1700e+02 1.8740e+03 1.8195e+04]\npop {'quality_ndcg@10': 0.01071, 'quality_users': 4263}\npositive {'quality_ndcg@10': 0.01071, 'quality_users': 4263}\norganic {'quality_ndcg@10': 3.2e-05, 'quality_users': 4263}\norgfrac {'quality_ndcg@10': 0.000347, 'quality_users': 4263}\norg_sqrtpop {'quality_ndcg@10': 0.010206, 'quality_users': 4263}\nbaseline {'quality_ndcg@10': 0.02128, 'quality_users': 4263}\nbaseline hit<= [(1, 114), (10, 644), (100, 2619)] relevant 37769\n" } } ## Step 26 · agent · 2026-09-23T21:48:57.746Z ### Thinking unavailable — no text recorded Public diagnostics sharpen the hypothesis: the baseline finds only 644 of 37,769 relevant user–item pairs in its top 10, while a global popularity rank scores 0.0107 versus 0.02128 for the model. Uniform tail negatives therefore spend most updates on trivially separated items. I’m adding controlled sampler modes that emphasize confusable popular/in-batch items and remove the questionable inverse-frequency downweighting, then I’ll compare public NDCG—not BCE alone. ### exec · 2026-09-23T21:49:04.923Z { "code": "const r = await tools.exec_command({cmd:\"sed -n '1080,1515p' /app/solution/train_current_model.py; sed -n '280,346p' /app/solution/two_tower_model.py; sed -n '320,540p' /app/solution/train_current_model.py; sed -n '880,1085p' /app/solution/train_current_model.py\",\"workdir\":\"/app\",\"yield_time_ms\":10000,\"max_output_tokens\":30000}); text(r.output)\n" } ### Tool output · 2026-09-23T21:49:04.988Z Script completed Wall time 0.1 seconds Output: event_features[row, :count] = prepared.event_features[positions] activity_features[row, :count] = prepared.activity_features[positions] state_ids[row, :count] = prepared.state_ids[positions] targets[row, :count] = prepared.sequence_items[target_positions] weights[row, :count] = target_weights[target_positions] score_from = min(count, max(int(score_starts[row]) - start, 0)) scored[row, score_from:count] = True processed[row] = count user_sequence = prepared.sequence_items[ offset : offset + int(lengths[user_row]) ] histories[row, :count] = history_windows( user_sequence, absolute_start, count, config.bptt_steps, padding_item, ) return ( input_items, event_features, activity_features, state_ids, targets, scored, histories, processed, weights, ) def score_target_microbatches( model: base.SequentialTwoTower, prepared: SequenceData, config: Config, sequence_vectors: torch.Tensor, flat_states: np.ndarray, flat_activity: np.ndarray, positive_items: torch.Tensor, negatives: torch.Tensor, negative_weights: torch.Tensor, sample_weights: np.ndarray, device: torch.device, backward: bool, ) -> tuple[dict[str, float], torch.Tensor | None]: """Compute one logical block's exact BCE in bounded-memory slices.""" target_count = len(positive_items) total_weight = float(sample_weights.sum()) if total_weight <= 0: raise RuntimeError("target block has no positive sample weight") sequence_gradient = torch.zeros_like(sequence_vectors) if backward else None statistics = { "loss_sum": 0.0, "positive_sum": 0.0, "negative_sum": 0.0, "pair_correct": 0.0, "weight_sum": 0.0, } for begin in range(0, target_count, config.loss_microbatch_size): end = min(begin + config.loss_microbatch_size, target_count) selected_states = flat_states[begin:end] if backward: sequence_input = ( sequence_vectors[begin:end].detach().requires_grad_(True) ) else: sequence_input = sequence_vectors[begin:end] liked_vectors, disliked_vectors, _ = pool_explicit_states( model, prepared, selected_states, device ) counts = prepared.state_counts[selected_states] numeric = np.zeros((end - begin, 6), dtype=np.float32) numeric[:, :4] = flat_activity[begin:end] numeric[:, 4] = np.log1p(counts[:, 0]) / 6.0 numeric[:, 5] = np.log1p(counts[:, 1]) / 4.0 query_vectors = user_queries( model, sequence_input, liked_vectors, disliked_vectors, torch.from_numpy(numeric).to(device), ) positive_vectors, negative_vectors = candidate_vectors( model, positive_items[begin:end], negatives[begin:end], ) positive_logits = (query_vectors * positive_vectors).sum(dim=1) negative_logits = torch.einsum( "bd,bkd->bk", query_vectors, negative_vectors ) positive_loss = F.softplus(-positive_logits) negative_loss = corrected_negative_loss( negative_logits, negative_weights[begin:end], config ) selected_weights = torch.from_numpy( sample_weights[begin:end].astype(np.float32, copy=False) ).to(device) loss_sum = ( selected_weights * (positive_loss + negative_loss) / 2.0 ).sum() if not bool(torch.isfinite(loss_sum)): raise RuntimeError("dense next-item training produced non-finite loss") if backward: (loss_sum / total_weight).backward() if sequence_input.grad is None: raise RuntimeError("sequence microbatch did not produce a gradient") sequence_gradient[begin:end] = sequence_input.grad statistics["loss_sum"] += float(loss_sum.detach().cpu()) statistics["positive_sum"] += float(positive_logits.detach().sum().cpu()) statistics["negative_sum"] += float(negative_logits.detach().sum().cpu()) statistics["pair_correct"] += float( (positive_logits.detach()[:, None] > negative_logits.detach()).sum().cpu() ) statistics["weight_sum"] += float(selected_weights.sum().detach().cpu()) return statistics, sequence_gradient def release_accelerator_cache(device: torch.device) -> None: if device.type == "mps": torch.mps.empty_cache() def run_training_epoch( model: base.SequentialTwoTower, optimizer: torch.optim.Optimizer, prepared: SequenceData, config: Config, target_weights: np.ndarray, window_starts: np.ndarray, target_counts: np.ndarray, item_correction: torch.Tensor, known_positive_packed: np.ndarray | None, generator: torch.Generator, device: torch.device, epoch: int, ) -> dict[str, float]: model.train() train_users = np.flatnonzero(target_counts > 0) sorted_users = train_users[ np.argsort(target_counts[train_users], kind="stable") ] groups = [ sorted_users[start : start + config.user_batch_size] for start in range(0, len(sorted_users), config.user_batch_size) ] group_order = torch.randperm(len(groups), generator=generator).numpy() negative_count = config.uniform_negatives + config.inbatch_negatives total_loss = 0.0 total_targets = 0 total_weight = 0.0 total_positive = 0.0 total_negative = 0.0 total_pair_correct = 0.0 batches = 0 started = time.monotonic() for group_number in group_order: users = groups[int(group_number)] group_counts = target_counts[users] hidden = torch.zeros( 1, len(users), config.embedding_dim, device=device ) max_targets = int(group_counts.max()) for start in range(0, max_targets, config.bptt_steps): steps = min(config.bptt_steps, max_targets - start) block = build_dense_block( prepared, target_weights, users, window_starts[users], group_counts, np.zeros(len(users), dtype=np.int64), start, steps, config, ) sequence_outputs, _ = event_sequence( model, torch.from_numpy(block[0].astype(np.int64)).to(device), torch.from_numpy(block[1].astype(np.float32)).to(device), hidden, ) hidden = torch.stack( [ sequence_outputs[row, count - 1] if count else hidden[0, row] for row, count in enumerate(block[7]) ] ).unsqueeze(0).detach() flat_scored = block[5].reshape(-1) if not np.any(flat_scored): continue mask = torch.from_numpy(flat_scored).to(device) sequence_vectors = sequence_outputs.reshape( -1, config.embedding_dim )[mask] flat_states = block[3].reshape(-1)[flat_scored] positive_items = torch.from_numpy( block[4].reshape(-1)[flat_scored].astype(np.int64) ).to(device) known_history = torch.from_numpy( block[6].reshape(-1, config.bptt_steps)[flat_scored].astype( np.int64 ) ).to(device) liked_items = torch.from_numpy( prepared.liked_states[flat_states].astype(np.int64) ).to(device) flat_user_rows = np.broadcast_to( users[:, None], block[5].shape ).reshape(-1)[flat_scored] negatives, negative_weights = draw_training_negatives( positive_items, known_history, liked_items, flat_user_rows, known_positive_packed, prepared, config, item_correction, generator, device, ) optimizer.zero_grad(set_to_none=True) statistics, sequence_gradient = score_target_microbatches( model, prepared, config, sequence_vectors, flat_states, block[2].reshape(-1, 4)[flat_scored].astype(np.float32), positive_items, negatives, negative_weights, block[8].reshape(-1)[flat_scored], device, backward=True, ) if sequence_gradient is None: raise RuntimeError("training block omitted its sequence gradient") sequence_vectors.backward(sequence_gradient) nn.utils.clip_grad_norm_(model.parameters(), config.gradient_clip) optimizer.step() count = len(positive_items) total_loss += statistics["loss_sum"] total_targets += count total_weight += statistics["weight_sum"] total_positive += statistics["positive_sum"] total_negative += statistics["negative_sum"] total_pair_correct += statistics["pair_correct"] batches += 1 if batches % 25 == 0: release_accelerator_cache(device) if batches % 250 == 0: batch_bce = statistics["loss_sum"] / max( statistics["weight_sum"], 1.0e-12 ) running_bce = total_loss / max(total_weight, 1.0e-12) log( f"epoch={epoch}/{config.epochs} batches={batches:,} " f"targets={total_targets:,} " f"batch_bce={batch_bce:.6f} " f"running_bce={running_bce:.6f} " f"elapsed={time.monotonic() - started:.1f}s" ) return { "epoch": float(epoch), "loss": total_loss / max(total_weight, 1.0e-12), "positive_logit": total_positive / max(total_targets, 1), "negative_logit": total_negative / max(total_targets * negative_count, 1), "pair_accuracy": total_pair_correct / max(total_targets * negative_count, 1), "targets": float(total_targets), "target_weight_sum": total_weight, "batches": float(batches), "seconds": time.monotonic() - started, } @torch.no_grad() def evaluate_validation_bce( model: base.SequentialTwoTower, prepared: SequenceData, config: Config, target_weights: np.ndarray, window_starts: np.ndarray, training_counts: np.ndarray, validation_counts: np.ndarray, item_correction: torch.Tensor, known_positive_packed: np.ndarray | None, device: torch.device, ) -> dict[str, float]: """Measure deterministic BCE on each user's chronological target suffix.""" model.eval() totals = training_counts + validation_counts users_with_validation = np.flatnonzero(validation_counts > 0) ordered = users_with_validation[ np.argsort(totals[users_with_validation], kind="stable") ] groups = [ ordered[start : start + config.user_batch_size] for start in range(0, len(ordered), config.user_batch_size) ] generator = torch.Generator(device="cpu").manual_seed(config.seed + 20_000) total_loss = 0.0 total_targets = 0 total_weight = 0.0 started = time.monotonic() for group_number, users in enumerate(groups, start=1): group_totals = totals[users] group_starts = training_counts[users] hidden = torch.zeros( 1, len(users), config.embedding_dim, device=device ) max_targets = int(group_totals.max()) for start in range(0, max_targets, config.bptt_steps): steps = min(config.bptt_steps, max_targets - start) block = build_dense_block( prepared, target_weights, users, window_starts[users], group_totals, group_starts, start, steps, config, ) sequence_outputs, _ = event_sequence( model, torch.from_numpy(block[0].astype(np.int64)).to(device), torch.from_numpy(block[1].astype(np.float32)).to(device), hidden, ) hidden = torch.stack( [ sequence_outputs[row, count - 1] if count else hidden[0, row] for row, count in enumerate(block[7]) ] ).unsqueeze(0) flat_scored = block[5].reshape(-1) if not np.any(flat_scored): continue mask = torch.from_numpy(flat_scored).to(device) sequence_vectors = sequence_outputs.reshape( -1, config.embedding_dim )[mask] flat_states = block[3].reshape(-1)[flat_scored] positive_items = torch.from_numpy( block[4].reshape(-1)[flat_scored].astype(np.int64) ).to(device) known_history = torch.from_numpy( block[6].reshape(-1, config.bptt_steps)[flat_scored].astype( np.int64 ) ).to(device) liked_items = torch.from_numpy( prepared.liked_states[flat_states].astype(np.int64) ).to(device) flat_user_rows = np.broadcast_to( users[:, None], block[5].shape ).reshape(-1)[flat_scored] negatives, negative_weights = draw_training_negatives( positive_items, known_history, liked_items, flat_user_rows, known_positive_packed, prepared, config, item_correction, generator, device, ) statistics, _ = score_target_microbatches( model, prepared, config, sequence_vectors, flat_states, block[2].reshape(-1, 4)[flat_scored].astype(np.float32), positive_items, negatives, negative_weights, block[8].reshape(-1)[flat_scored], device, backward=False, ) total_loss += statistics["loss_sum"] total_targets += len(positive_items) total_weight += statistics["weight_sum"] if group_number % 25 == 0: release_accelerator_cache(device) return { "validation_loss": total_loss / max(total_weight, 1.0e-12), "validation_targets": float(total_targets), "validation_target_weight_sum": total_weight, "validation_seconds": time.monotonic() - started, } def snapshot_model(model: nn.Module) -> dict[str, torch.Tensor]: return { name: value.detach().cpu().clone() for name, value in model.state_dict().items() } def save_epoch_checkpoint( checkpoint_dir: Path, epoch: int, model_state: dict[str, torch.Tensor], config: Config, diagnostics: dict[str, float], optimizer: torch.optim.Optimizer, generator: torch.Generator, ) -> Path: checkpoint_dir.mkdir(parents=True, exist_ok=True) path = checkpoint_dir / f"epoch-{epoch:02d}.pt" torch.save( { "epoch": epoch, "config": asdict(config), "diagnostics": diagnostics, "model_state": model_state, "optimizer_state": optimizer.state_dict(), "generator_state": generator.get_state(), }, path, destination[row, : len(retained)] = retained.astype(np.uint16) return liked, disliked, like_counts, dislike_counts class SequentialTwoTower(nn.Module): """Order-sensitive user tower and independent catalog-aware item tower.""" def __init__(self, item_features: np.ndarray, config: TowerConfig) -> None: super().__init__() n_items, n_item_features = item_features.shape dim = config.embedding_dim self.n_items = n_items self.context_embedding = nn.Embedding( n_items + 1, dim, padding_idx=n_items ) self.event_projection = nn.Sequential( nn.Linear(dim + 3, config.hidden_dim), nn.GELU(), ) self.sequence_encoder = nn.GRU( input_size=config.hidden_dim, hidden_size=dim, num_layers=1, batch_first=True, ) self.user_tower = nn.Sequential( nn.Linear(dim * 3 + 6, config.user_hidden_1), nn.GELU(), nn.Dropout(config.dropout), nn.Linear(config.user_hidden_1, config.user_hidden_2), nn.GELU(), nn.Dropout(config.dropout), nn.Linear(config.user_hidden_2, dim), ) self.candidate_embedding = nn.Embedding(n_items, dim) self.register_buffer( "item_features", torch.from_numpy(item_features), persistent=True ) self.item_tower = nn.Sequential( nn.Linear(dim + n_item_features, config.item_hidden_1), nn.GELU(), nn.Dropout(config.dropout), nn.Linear(config.item_hidden_1, config.item_hidden_2), nn.GELU(), nn.Dropout(config.dropout), nn.Linear(config.item_hidden_2, dim), ) nn.init.normal_(self.context_embedding.weight, std=0.02) nn.init.normal_(self.candidate_embedding.weight, std=0.02) with torch.no_grad(): self.context_embedding.weight[n_items].zero_() def _mean_context_channel(self, items: torch.Tensor) -> torch.Tensor: mask = items.ne(self.n_items) vectors = self.context_embedding(items) return (vectors * mask.unsqueeze(-1)).sum(dim=1) / mask.sum( dim=1, keepdim=True ).clamp_min(1) def encode_items(self, items: torch.Tensor) -> torch.Tensor: inputs = torch.cat( [self.candidate_embedding(items), self.item_features[items]], dim=1 ) return self.item_tower(inputs) def invalid_negative_mask( dislike_count: int, ) -> np.ndarray: start = int( np.searchsorted( timestamps, history_end - base.PROFILE_LOOKBACK_DAYS * base.DAY, side="left", ) ) result = np.zeros(6, dtype=np.float32) recent_items = items[start:] if len(recent_items): result[0] = np.log1p(len(recent_items)) / 8.0 result[1] = np.log1p(len(np.unique(recent_items))) / 6.0 result[2] = float(np.mean(event_features[start:, 0])) result[3] = float(np.mean(event_features[start:, 1])) result[4] = np.log1p(like_count) / 6.0 result[5] = np.log1p(dislike_count) / 4.0 return result def prepare_data( public: Path, stage: str, config: Config ) -> tuple[SequenceData, CandidateSet]: data = public / "data" catalog = pd.read_parquet(data / "candidate_catalog.parquet").sort_values( "popularity_rank" ) item_ids = catalog.item_id.to_numpy(dtype=np.int64, copy=True) item_index = pd.Index(item_ids) n_items = len(item_ids) if n_items >= np.iinfo(np.uint16).max: raise RuntimeError("uint16 item storage is too small for this catalog") if stage == "validation": prefixes = ("train",) history_end = base.TRAIN_END candidate_name = "validation_eligible_candidates.npz" state_name = "validation_preference_state.parquet" else: prefixes = ("train", "val") history_end = base.VALIDATION_END candidate_name = "test_eligible_candidates.npz" state_name = "test_preference_state.parquet" eligibility = CandidateSet.read(data / candidate_name) if not np.array_equal(eligibility.item_ids, item_ids): raise RuntimeError("catalog and candidate artifact item order differ") explicit_by_user = base.load_explicit_events(data, prefixes, item_index) inference_likes, inference_dislikes, like_counts, dislike_counts = ( base.load_inference_state( data / state_name, item_index, eligibility.uids, n_items, ) ) inference_rows = {int(uid): row for row, uid in enumerate(eligibility.uids)} inference_user_features = np.zeros((len(eligibility.uids), 6), dtype=np.float32) inference_sequence_rows = np.full(len(eligibility.uids), -1, dtype=np.int32) # Snapshot zero is the shared empty explicit state. liked_states = [np.full(base.LIKE_ITEMS, n_items, dtype=np.uint16)] disliked_states = [ np.full(base.DISLIKE_ITEMS, n_items, dtype=np.uint16) ] state_counts: list[tuple[int, int]] = [(0, 0)] user_ids: list[int] = [] offsets = [0] timestamp_parts: list[np.ndarray] = [] item_parts: list[np.ndarray] = [] event_parts: list[np.ndarray] = [] activity_parts: list[np.ndarray] = [] state_parts: list[np.ndarray] = [] listen_paths = [data / f"{prefix}_listens.parquet" for prefix in prefixes] started = time.monotonic() for seen_users, (uid, listens) in enumerate( base.merge_listen_streams(listen_paths, item_index), start=1 ): parts = build_sequence_parts( listens, explicit_by_user.get(uid, base.empty_explicit_events()), n_items, liked_states, disliked_states, state_counts, ) if parts is None: continue sequence_row = len(user_ids) user_ids.append(uid) timestamp_parts.append(parts[0].astype(np.uint32, copy=False)) item_parts.append(parts[1]) event_parts.append(parts[2]) activity_parts.append(parts[3]) state_parts.append(parts[4]) offsets.append(offsets[-1] + len(parts[1])) inference_row = inference_rows.get(uid) if inference_row is not None: inference_sequence_rows[inference_row] = sequence_row inference_user_features[inference_row] = final_user_features( parts[0], parts[1], parts[2], history_end, int(like_counts[inference_row]), int(dislike_counts[inference_row]), ) if seen_users % 1_000 == 0: log( f"prepared users={seen_users:,} tokens={offsets[-1]:,} " f"states={len(liked_states):,} " f"elapsed={time.monotonic() - started:.1f}s" ) missing = np.flatnonzero(inference_sequence_rows < 0) if len(missing): inference_user_features[missing, 4] = np.log1p(like_counts[missing]) / 6.0 inference_user_features[missing, 5] = ( np.log1p(dislike_counts[missing]) / 4.0 ) log(f"target users without qualifying catalog sequence={len(missing):,}") prepared = SequenceData( item_ids=item_ids, item_features=base.build_item_features(catalog), user_ids=np.asarray(user_ids, dtype=np.int64), offsets=np.asarray(offsets, dtype=np.int64), sequence_timestamps=np.concatenate(timestamp_parts), sequence_items=np.concatenate(item_parts), event_features=np.concatenate(event_parts), activity_features=np.concatenate(activity_parts), state_ids=np.concatenate(state_parts), liked_states=np.stack(liked_states), disliked_states=np.stack(disliked_states), state_counts=np.asarray(state_counts, dtype=np.int32), inference_user_rows=inference_sequence_rows, inference_liked_items=inference_likes, inference_disliked_items=inference_dislikes, inference_user_features=inference_user_features, ) log( f"prepared stage={stage} sequence_users={len(prepared.user_ids):,} " f"tokens={len(prepared.sequence_items):,} " f"next_item_targets={prepared.target_count:,} " f"states={len(prepared.liked_states):,}" ) return prepared, eligibility def cache_metadata(stage: str, config: Config) -> dict[str, object]: return { "cache_version": CACHE_VERSION, "stage": stage, "positive_listen_threshold": base.LISTEN_POSITIVE_THRESHOLD, "profile_lookback_days": base.PROFILE_LOOKBACK_DAYS, "event_time_feature": "exp-negative-gap-over-60-days", } def save_cache( path: Path, prepared: SequenceData, stage: str, config: Config ) -> None: path.parent.mkdir(parents=True, exist_ok=True) np.savez( path, metadata=np.asarray(json.dumps(cache_metadata(stage, config), sort_keys=True)), **prepared.__dict__, ) log(f"saved public-derived full-sequence cache: {path}") def load_cache(path: Path, stage: str, config: Config) -> SequenceData: with np.load(path, allow_pickle=False) as artifact: actual = json.loads(str(artifact["metadata"].item())) expected = cache_metadata(stage, config) if actual != expected: raise RuntimeError(f"sequence cache differs: {actual} != {expected}") values = { field: artifact[field].copy() for field in SequenceData.__dataclass_fields__ } prepared = SequenceData(**values) log( f"loaded full-sequence cache: tokens={len(prepared.sequence_items):,} " f"targets={prepared.target_count:,}" ) return prepared def load_or_prepare( public: Path, stage: str, config: Config, cache: Path | None, ) -> tuple[SequenceData, CandidateSet]: candidate_name = ( "validation_eligible_candidates.npz" if stage == "validation" else "test_eligible_candidates.npz" ) eligibility = CandidateSet.read(public / "data" / candidate_name) if cache is not None and cache.is_file(): prepared = load_cache(cache, stage, config) if not np.array_equal(prepared.item_ids, eligibility.item_ids): raise RuntimeError("cached catalog differs from candidate artifact") return prepared, eligibility prepared, built_eligibility = prepare_data(public, stage, config) if cache is not None: save_cache(cache, prepared, stage, config) return prepared, built_eligibility def build_item_correction( prepared: SequenceData, config: Config, target_starts: np.ndarray, target_counts: np.ndarray, ) -> torch.Tensor: """Estimate in-batch propensities from the selected training targets.""" raise RuntimeError("chronological target partition produced negative counts") if not np.array_equal( window_starts + training_counts + validation_counts, total_targets ): raise RuntimeError("chronological target window is not a final contiguous suffix") return window_starts def chronological_target_partition( prepared: SequenceData, validation_fraction: float, max_train_targets_per_user: int, max_validation_targets_per_user: int, ) -> TargetPartition: """Select a recent contiguous window with a final out-of-time BCE suffix.""" totals = np.maximum(prepared.lengths - 1, 0).astype(np.int64) validation = np.floor(totals * validation_fraction).astype(np.int64) validation[(totals >= 2) & (validation == 0)] = 1 if max_validation_targets_per_user: validation = np.minimum(validation, max_validation_targets_per_user) history_training = totals - validation training = history_training.copy() if max_train_targets_per_user: training = np.minimum(training, max_train_targets_per_user) window_starts = retained_target_window_starts(totals, validation, training) return TargetPartition( window_starts=window_starts, training_counts=training, validation_counts=validation, history_training_counts=history_training, ) def load_organic_like_outcomes( public: Path, stage: str, item_ids: np.ndarray ) -> dict[int, dict[int, np.ndarray]]: """Load mapped organic-like timestamps from public fitting history.""" prefixes = ("train",) if stage == "validation" else ("train", "val") frames = [ pd.read_parquet( public / "data" / f"{prefix}_likes.parquet", columns=["uid", "timestamp", "item_id", "is_organic"], ) for prefix in prefixes ] likes = pd.concat(frames, ignore_index=True) likes = likes[likes.is_organic == 1].copy() mapped = pd.Index(item_ids).get_indexer( likes.item_id.to_numpy(dtype=np.int64) ) likes = likes.loc[mapped >= 0, ["uid", "timestamp"]].copy() likes["item"] = mapped[mapped >= 0].astype(np.int32, copy=False) likes = likes.sort_values(["uid", "item", "timestamp"], kind="stable") nested: dict[int, dict[int, list[int]]] = {} for raw_uid, raw_timestamp, raw_item in likes.itertuples( index=False, name=None ): nested.setdefault(int(raw_uid), {}).setdefault(int(raw_item), []).append( int(raw_timestamp) ) result = { uid: { item: np.asarray(timestamps, dtype=np.int64) for item, timestamps in items.items() } for uid, items in nested.items() } log( f"loaded organic-like outcomes: rows={len(likes):,} " f"users={len(result):,}" ) return result def build_target_weights( public: Path, stage: str, prepared: SequenceData, training_counts: np.ndarray, config: Config, ) -> np.ndarray: """Build nonzero per-token weights without dropping adjacent targets.""" if config.target_weighting == "uniform": weights = np.ones(len(prepared.sequence_items), dtype=np.float32) else: weights = np.full( len(prepared.sequence_items), config.ordinary_target_weight, dtype=np.float32, ) organic_strong = ( (prepared.event_features[:, 0] > 0.5) & (prepared.event_features[:, 1] >= 0.8) ) weights[organic_strong] = config.organic_strong_target_weight if config.target_weighting == "discovery-graded": like_outcomes = load_organic_like_outcomes( public, stage, prepared.item_ids ) history_end = ( base.TRAIN_END if stage == "validation" else base.VALIDATION_END ) horizon = config.discovery_horizon_days * base.DAY grade_three = 0 for user_row, uid in enumerate(prepared.user_ids): start = int(prepared.offsets[user_row]) end = int(prepared.offsets[user_row + 1]) if end - start < 2: continue last_training_target = start + int(training_counts[user_row]) first_validation_target = last_training_target + 1 split_timestamp = ( int(prepared.sequence_timestamps[first_validation_target]) if first_validation_target < end else history_end ) user_likes = like_outcomes.get(int(uid), {}) seen = {int(prepared.sequence_items[start])} for position in range(start + 1, end): item = int(prepared.sequence_items[position]) novel = item not in seen seen.add(item) if not novel: # Repeats remain training examples, but they cannot be # eligible discovery outcomes at the corresponding # cutoff and therefore keep only the ordinary weight. weights[position] = config.ordinary_target_weight continue timestamps = user_likes.get(item) if timestamps is None: continue timestamp = int(prepared.sequence_timestamps[position]) upper = min( timestamp + horizon, split_timestamp if position <= last_training_target else history_end, ) outcome = int(np.searchsorted(timestamps, timestamp, side="left")) if outcome < len(timestamps) and int(timestamps[outcome]) < upper: weights[position] = config.organic_like_target_weight grade_three += 1 log( f"grade-3 first-encounter targets={grade_three:,} " f"horizon_days={config.discovery_horizon_days}" ) log( f"target weighting={config.target_weighting} " f"min={weights.min():.3f} mean={weights.mean():.3f} " f"max={weights.max():.3f}" ) return weights def build_dense_block( prepared: SequenceData, target_weights: np.ndarray, users: np.ndarray, window_starts: np.ndarray, process_counts: np.ndarray, score_starts: np.ndarray, start: int, steps: int, config: Config, ) -> tuple[np.ndarray, ...]: """Build one causal sequence block and mark the target rows to score.""" batch_size = len(users) padding_item = len(prepared.item_ids) input_items = np.full((batch_size, steps), padding_item, dtype=np.uint16) event_features = np.zeros((batch_size, steps, 3), dtype=np.float16) activity_features = np.zeros((batch_size, steps, 4), dtype=np.float16) state_ids = np.zeros((batch_size, steps), dtype=np.uint32) targets = np.zeros((batch_size, steps), dtype=np.uint16) weights = np.ones((batch_size, steps), dtype=np.float32) scored = np.zeros((batch_size, steps), dtype=bool) histories = np.full( (batch_size, steps, config.bptt_steps), padding_item, dtype=np.uint16, ) processed = np.zeros(batch_size, dtype=np.int32) lengths = prepared.lengths for row, user_row in enumerate(users): count = min(steps, max(int(process_counts[row]) - start, 0)) if not count: continue offset = int(prepared.offsets[user_row]) window_start = int(window_starts[row]) absolute_start = window_start + start positions = slice( offset + absolute_start, offset + absolute_start + count, ) target_positions = slice( offset + absolute_start + 1, offset + absolute_start + count + 1, ) input_items[row, :count] = prepared.sequence_items[positions] event_features[row, :count] = prepared.event_features[positions] activity_features[row, :count] = prepared.activity_features[positions] state_ids[row, :count] = prepared.state_ids[positions] targets[row, :count] = prepared.sequence_items[target_positions] weights[row, :count] = target_weights[target_positions] score_from = min(count, max(int(score_starts[row]) - start, 0)) ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-f8c50588-162c-4f0b-803a-7985bed4d1dd", "process_id": "98962", "command": [ "/bin/sh", "-lc", "sed -n '1080,1515p' /app/solution/train_current_model.py; sed -n '280,346p' /app/solution/two_tower_model.py; sed -n '320,540p' /app/solution/train_current_model.py; sed -n '880,1085p' /app/solution/train_current_model.py" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "read", "cmd": "sed -n '1080,1515p' /app/solution/train_current_model.py", "name": "train_current_model.py", "path": "/app/solution/train_current_model.py" }, { "type": "read", "cmd": "sed -n '280,346p' /app/solution/two_tower_model.py", "name": "two_tower_model.py", "path": "/app/solution/two_tower_model.py" }, { "type": "read", "cmd": "sed -n '320,540p' /app/solution/train_current_model.py", "name": "train_current_model.py", "path": "/app/solution/train_current_model.py" }, { "type": "read", "cmd": "sed -n '880,1085p' /app/solution/train_current_model.py", "name": "train_current_model.py", "path": "/app/solution/train_current_model.py" } ], "source": "unified_exec_startup", "status": "completed", "stdout": " event_features[row, :count] = prepared.event_features[positions]\n activity_features[row, :count] = prepared.activity_features[positions]\n state_ids[row, :count] = prepared.state_ids[positions]\n targets[row, :count] = prepared.sequence_items[target_positions]\n weights[row, :count] = target_weights[target_positions]\n score_from = min(count, max(int(score_starts[row]) - start, 0))\n scored[row, score_from:count] = True\n processed[row] = count\n user_sequence = prepared.sequence_items[\n offset : offset + int(lengths[user_row])\n ]\n histories[row, :count] = history_windows(\n user_sequence,\n absolute_start,\n count,\n config.bptt_steps,\n padding_item,\n )\n return (\n input_items,\n event_features,\n activity_features,\n state_ids,\n targets,\n scored,\n histories,\n processed,\n weights,\n )\n\n\ndef score_target_microbatches(\n model: base.SequentialTwoTower,\n prepared: SequenceData,\n config: Config,\n sequence_vectors: torch.Tensor,\n flat_states: np.ndarray,\n flat_activity: np.ndarray,\n positive_items: torch.Tensor,\n negatives: torch.Tensor,\n negative_weights: torch.Tensor,\n sample_weights: np.ndarray,\n device: torch.device,\n backward: bool,\n) -> tuple[dict[str, float], torch.Tensor | None]:\n \"\"\"Compute one logical block's exact BCE in bounded-memory slices.\"\"\"\n target_count = len(positive_items)\n total_weight = float(sample_weights.sum())\n if total_weight <= 0:\n raise RuntimeError(\"target block has no positive sample weight\")\n sequence_gradient = torch.zeros_like(sequence_vectors) if backward else None\n statistics = {\n \"loss_sum\": 0.0,\n \"positive_sum\": 0.0,\n \"negative_sum\": 0.0,\n \"pair_correct\": 0.0,\n \"weight_sum\": 0.0,\n }\n for begin in range(0, target_count, config.loss_microbatch_size):\n end = min(begin + config.loss_microbatch_size, target_count)\n selected_states = flat_states[begin:end]\n if backward:\n sequence_input = (\n sequence_vectors[begin:end].detach().requires_grad_(True)\n )\n else:\n sequence_input = sequence_vectors[begin:end]\n liked_vectors, disliked_vectors, _ = pool_explicit_states(\n model, prepared, selected_states, device\n )\n counts = prepared.state_counts[selected_states]\n numeric = np.zeros((end - begin, 6), dtype=np.float32)\n numeric[:, :4] = flat_activity[begin:end]\n numeric[:, 4] = np.log1p(counts[:, 0]) / 6.0\n numeric[:, 5] = np.log1p(counts[:, 1]) / 4.0\n query_vectors = user_queries(\n model,\n sequence_input,\n liked_vectors,\n disliked_vectors,\n torch.from_numpy(numeric).to(device),\n )\n positive_vectors, negative_vectors = candidate_vectors(\n model,\n positive_items[begin:end],\n negatives[begin:end],\n )\n positive_logits = (query_vectors * positive_vectors).sum(dim=1)\n negative_logits = torch.einsum(\n \"bd,bkd->bk\", query_vectors, negative_vectors\n )\n positive_loss = F.softplus(-positive_logits)\n negative_loss = corrected_negative_loss(\n negative_logits, negative_weights[begin:end], config\n )\n selected_weights = torch.from_numpy(\n sample_weights[begin:end].astype(np.float32, copy=False)\n ).to(device)\n loss_sum = (\n selected_weights * (positive_loss + negative_loss) / 2.0\n ).sum()\n if not bool(torch.isfinite(loss_sum)):\n raise RuntimeError(\"dense next-item training produced non-finite loss\")\n if backward:\n (loss_sum / total_weight).backward()\n if sequence_input.grad is None:\n raise RuntimeError(\"sequence microbatch did not produce a gradient\")\n sequence_gradient[begin:end] = sequence_input.grad\n statistics[\"loss_sum\"] += float(loss_sum.detach().cpu())\n statistics[\"positive_sum\"] += float(positive_logits.detach().sum().cpu())\n statistics[\"negative_sum\"] += float(negative_logits.detach().sum().cpu())\n statistics[\"pair_correct\"] += float(\n (positive_logits.detach()[:, None] > negative_logits.detach()).sum().cpu()\n )\n statistics[\"weight_sum\"] += float(selected_weights.sum().detach().cpu())\n return statistics, sequence_gradient\n\n\ndef release_accelerator_cache(device: torch.device) -> None:\n if device.type == \"mps\":\n torch.mps.empty_cache()\n\n\ndef run_training_epoch(\n model: base.SequentialTwoTower,\n optimizer: torch.optim.Optimizer,\n prepared: SequenceData,\n config: Config,\n target_weights: np.ndarray,\n window_starts: np.ndarray,\n target_counts: np.ndarray,\n item_correction: torch.Tensor,\n known_positive_packed: np.ndarray | None,\n generator: torch.Generator,\n device: torch.device,\n epoch: int,\n) -> dict[str, float]:\n model.train()\n train_users = np.flatnonzero(target_counts > 0)\n sorted_users = train_users[\n np.argsort(target_counts[train_users], kind=\"stable\")\n ]\n groups = [\n sorted_users[start : start + config.user_batch_size]\n for start in range(0, len(sorted_users), config.user_batch_size)\n ]\n group_order = torch.randperm(len(groups), generator=generator).numpy()\n negative_count = config.uniform_negatives + config.inbatch_negatives\n total_loss = 0.0\n total_targets = 0\n total_weight = 0.0\n total_positive = 0.0\n total_negative = 0.0\n total_pair_correct = 0.0\n batches = 0\n started = time.monotonic()\n\n for group_number in group_order:\n users = groups[int(group_number)]\n group_counts = target_counts[users]\n hidden = torch.zeros(\n 1, len(users), config.embedding_dim, device=device\n )\n max_targets = int(group_counts.max())\n for start in range(0, max_targets, config.bptt_steps):\n steps = min(config.bptt_steps, max_targets - start)\n block = build_dense_block(\n prepared,\n target_weights,\n users,\n window_starts[users],\n group_counts,\n np.zeros(len(users), dtype=np.int64),\n start,\n steps,\n config,\n )\n sequence_outputs, _ = event_sequence(\n model,\n torch.from_numpy(block[0].astype(np.int64)).to(device),\n torch.from_numpy(block[1].astype(np.float32)).to(device),\n hidden,\n )\n hidden = torch.stack(\n [\n sequence_outputs[row, count - 1]\n if count\n else hidden[0, row]\n for row, count in enumerate(block[7])\n ]\n ).unsqueeze(0).detach()\n flat_scored = block[5].reshape(-1)\n if not np.any(flat_scored):\n continue\n mask = torch.from_numpy(flat_scored).to(device)\n sequence_vectors = sequence_outputs.reshape(\n -1, config.embedding_dim\n )[mask]\n flat_states = block[3].reshape(-1)[flat_scored]\n positive_items = torch.from_numpy(\n block[4].reshape(-1)[flat_scored].astype(np.int64)\n ).to(device)\n known_history = torch.from_numpy(\n block[6].reshape(-1, config.bptt_steps)[flat_scored].astype(\n np.int64\n )\n ).to(device)\n liked_items = torch.from_numpy(\n prepared.liked_states[flat_states].astype(np.int64)\n ).to(device)\n flat_user_rows = np.broadcast_to(\n users[:, None], block[5].shape\n ).reshape(-1)[flat_scored]\n negatives, negative_weights = draw_training_negatives(\n positive_items,\n known_history,\n liked_items,\n flat_user_rows,\n known_positive_packed,\n prepared,\n config,\n item_correction,\n generator,\n device,\n )\n optimizer.zero_grad(set_to_none=True)\n statistics, sequence_gradient = score_target_microbatches(\n model,\n prepared,\n config,\n sequence_vectors,\n flat_states,\n block[2].reshape(-1, 4)[flat_scored].astype(np.float32),\n positive_items,\n negatives,\n negative_weights,\n block[8].reshape(-1)[flat_scored],\n device,\n backward=True,\n )\n if sequence_gradient is None:\n raise RuntimeError(\"training block omitted its sequence gradient\")\n sequence_vectors.backward(sequence_gradient)\n nn.utils.clip_grad_norm_(model.parameters(), config.gradient_clip)\n optimizer.step()\n\n count = len(positive_items)\n total_loss += statistics[\"loss_sum\"]\n total_targets += count\n total_weight += statistics[\"weight_sum\"]\n total_positive += statistics[\"positive_sum\"]\n total_negative += statistics[\"negative_sum\"]\n total_pair_correct += statistics[\"pair_correct\"]\n batches += 1\n if batches % 25 == 0:\n release_accelerator_cache(device)\n if batches % 250 == 0:\n batch_bce = statistics[\"loss_sum\"] / max(\n statistics[\"weight_sum\"], 1.0e-12\n )\n running_bce = total_loss / max(total_weight, 1.0e-12)\n log(\n f\"epoch={epoch}/{config.epochs} batches={batches:,} \"\n f\"targets={total_targets:,} \"\n f\"batch_bce={batch_bce:.6f} \"\n f\"running_bce={running_bce:.6f} \"\n f\"elapsed={time.monotonic() - started:.1f}s\"\n )\n\n return {\n \"epoch\": float(epoch),\n \"loss\": total_loss / max(total_weight, 1.0e-12),\n \"positive_logit\": total_positive / max(total_targets, 1),\n \"negative_logit\": total_negative / max(total_targets * negative_count, 1),\n \"pair_accuracy\": total_pair_correct\n / max(total_targets * negative_count, 1),\n \"targets\": float(total_targets),\n \"target_weight_sum\": total_weight,\n \"batches\": float(batches),\n \"seconds\": time.monotonic() - started,\n }\n\n\n@torch.no_grad()\ndef evaluate_validation_bce(\n model: base.SequentialTwoTower,\n prepared: SequenceData,\n config: Config,\n target_weights: np.ndarray,\n window_starts: np.ndarray,\n training_counts: np.ndarray,\n validation_counts: np.ndarray,\n item_correction: torch.Tensor,\n known_positive_packed: np.ndarray | None,\n device: torch.device,\n) -> dict[str, float]:\n \"\"\"Measure deterministic BCE on each user's chronological target suffix.\"\"\"\n model.eval()\n totals = training_counts + validation_counts\n users_with_validation = np.flatnonzero(validation_counts > 0)\n ordered = users_with_validation[\n np.argsort(totals[users_with_validation], kind=\"stable\")\n ]\n groups = [\n ordered[start : start + config.user_batch_size]\n for start in range(0, len(ordered), config.user_batch_size)\n ]\n generator = torch.Generator(device=\"cpu\").manual_seed(config.seed + 20_000)\n total_loss = 0.0\n total_targets = 0\n total_weight = 0.0\n started = time.monotonic()\n\n for group_number, users in enumerate(groups, start=1):\n group_totals = totals[users]\n group_starts = training_counts[users]\n hidden = torch.zeros(\n 1, len(users), config.embedding_dim, device=device\n )\n max_targets = int(group_totals.max())\n for start in range(0, max_targets, config.bptt_steps):\n steps = min(config.bptt_steps, max_targets - start)\n block = build_dense_block(\n prepared,\n target_weights,\n users,\n window_starts[users],\n group_totals,\n group_starts,\n start,\n steps,\n config,\n )\n sequence_outputs, _ = event_sequence(\n model,\n torch.from_numpy(block[0].astype(np.int64)).to(device),\n torch.from_numpy(block[1].astype(np.float32)).to(device),\n hidden,\n )\n hidden = torch.stack(\n [\n sequence_outputs[row, count - 1]\n if count\n else hidden[0, row]\n for row, count in enumerate(block[7])\n ]\n ).unsqueeze(0)\n flat_scored = block[5].reshape(-1)\n if not np.any(flat_scored):\n continue\n mask = torch.from_numpy(flat_scored).to(device)\n sequence_vectors = sequence_outputs.reshape(\n -1, config.embedding_dim\n )[mask]\n flat_states = block[3].reshape(-1)[flat_scored]\n positive_items = torch.from_numpy(\n block[4].reshape(-1)[flat_scored].astype(np.int64)\n ).to(device)\n known_history = torch.from_numpy(\n block[6].reshape(-1, config.bptt_steps)[flat_scored].astype(\n np.int64\n )\n ).to(device)\n liked_items = torch.from_numpy(\n prepared.liked_states[flat_states].astype(np.int64)\n ).to(device)\n flat_user_rows = np.broadcast_to(\n users[:, None], block[5].shape\n ).reshape(-1)[flat_scored]\n negatives, negative_weights = draw_training_negatives(\n positive_items,\n known_history,\n liked_items,\n flat_user_rows,\n known_positive_packed,\n prepared,\n config,\n item_correction,\n generator,\n device,\n )\n statistics, _ = score_target_microbatches(\n model,\n prepared,\n config,\n sequence_vectors,\n flat_states,\n block[2].reshape(-1, 4)[flat_scored].astype(np.float32),\n positive_items,\n negatives,\n negative_weights,\n block[8].reshape(-1)[flat_scored],\n device,\n backward=False,\n )\n total_loss += statistics[\"loss_sum\"]\n total_targets += len(positive_items)\n total_weight += statistics[\"weight_sum\"]\n if group_number % 25 == 0:\n release_accelerator_cache(device)\n return {\n \"validation_loss\": total_loss / max(total_weight, 1.0e-12),\n \"validation_targets\": float(total_targets),\n \"validation_target_weight_sum\": total_weight,\n \"validation_seconds\": time.monotonic() - started,\n }\n\n\ndef snapshot_model(model: nn.Module) -> dict[str, torch.Tensor]:\n return {\n name: value.detach().cpu().clone()\n for name, value in model.state_dict().items()\n }\n\n\ndef save_epoch_checkpoint(\n checkpoint_dir: Path,\n epoch: int,\n model_state: dict[str, torch.Tensor],\n config: Config,\n diagnostics: dict[str, float],\n optimizer: torch.optim.Optimizer,\n generator: torch.Generator,\n) -> Path:\n checkpoint_dir.mkdir(parents=True, exist_ok=True)\n path = checkpoint_dir / f\"epoch-{epoch:02d}.pt\"\n torch.save(\n {\n \"epoch\": epoch,\n \"config\": asdict(config),\n \"diagnostics\": diagnostics,\n \"model_state\": model_state,\n \"optimizer_state\": optimizer.state_dict(),\n \"generator_state\": generator.get_state(),\n },\n path,\n destination[row, : len(retained)] = retained.astype(np.uint16)\n return liked, disliked, like_counts, dislike_counts\n\n\nclass SequentialTwoTower(nn.Module):\n \"\"\"Order-sensitive user tower and independent catalog-aware item tower.\"\"\"\n\n def __init__(self, item_features: np.ndarray, config: TowerConfig) -> None:\n super().__init__()\n n_items, n_item_features = item_features.shape\n dim = config.embedding_dim\n self.n_items = n_items\n self.context_embedding = nn.Embedding(\n n_items + 1, dim, padding_idx=n_items\n )\n self.event_projection = nn.Sequential(\n nn.Linear(dim + 3, config.hidden_dim),\n nn.GELU(),\n )\n self.sequence_encoder = nn.GRU(\n input_size=config.hidden_dim,\n hidden_size=dim,\n num_layers=1,\n batch_first=True,\n )\n self.user_tower = nn.Sequential(\n nn.Linear(dim * 3 + 6, config.user_hidden_1),\n nn.GELU(),\n nn.Dropout(config.dropout),\n nn.Linear(config.user_hidden_1, config.user_hidden_2),\n nn.GELU(),\n nn.Dropout(config.dropout),\n nn.Linear(config.user_hidden_2, dim),\n )\n self.candidate_embedding = nn.Embedding(n_items, dim)\n self.register_buffer(\n \"item_features\", torch.from_numpy(item_features), persistent=True\n )\n self.item_tower = nn.Sequential(\n nn.Linear(dim + n_item_features, config.item_hidden_1),\n nn.GELU(),\n nn.Dropout(config.dropout),\n nn.Linear(config.item_hidden_1, config.item_hidden_2),\n nn.GELU(),\n nn.Dropout(config.dropout),\n nn.Linear(config.item_hidden_2, dim),\n )\n nn.init.normal_(self.context_embedding.weight, std=0.02)\n nn.init.normal_(self.candidate_embedding.weight, std=0.02)\n with torch.no_grad():\n self.context_embedding.weight[n_items].zero_()\n\n def _mean_context_channel(self, items: torch.Tensor) -> torch.Tensor:\n mask = items.ne(self.n_items)\n vectors = self.context_embedding(items)\n return (vectors * mask.unsqueeze(-1)).sum(dim=1) / mask.sum(\n dim=1, keepdim=True\n ).clamp_min(1)\n\n def encode_items(self, items: torch.Tensor) -> torch.Tensor:\n inputs = torch.cat(\n [self.candidate_embedding(items), self.item_features[items]], dim=1\n )\n return self.item_tower(inputs)\n\n\ndef invalid_negative_mask(\n dislike_count: int,\n) -> np.ndarray:\n start = int(\n np.searchsorted(\n timestamps,\n history_end - base.PROFILE_LOOKBACK_DAYS * base.DAY,\n side=\"left\",\n )\n )\n result = np.zeros(6, dtype=np.float32)\n recent_items = items[start:]\n if len(recent_items):\n result[0] = np.log1p(len(recent_items)) / 8.0\n result[1] = np.log1p(len(np.unique(recent_items))) / 6.0\n result[2] = float(np.mean(event_features[start:, 0]))\n result[3] = float(np.mean(event_features[start:, 1]))\n result[4] = np.log1p(like_count) / 6.0\n result[5] = np.log1p(dislike_count) / 4.0\n return result\n\n\ndef prepare_data(\n public: Path, stage: str, config: Config\n) -> tuple[SequenceData, CandidateSet]:\n data = public / \"data\"\n catalog = pd.read_parquet(data / \"candidate_catalog.parquet\").sort_values(\n \"popularity_rank\"\n )\n item_ids = catalog.item_id.to_numpy(dtype=np.int64, copy=True)\n item_index = pd.Index(item_ids)\n n_items = len(item_ids)\n if n_items >= np.iinfo(np.uint16).max:\n raise RuntimeError(\"uint16 item storage is too small for this catalog\")\n\n if stage == \"validation\":\n prefixes = (\"train\",)\n history_end = base.TRAIN_END\n candidate_name = \"validation_eligible_candidates.npz\"\n state_name = \"validation_preference_state.parquet\"\n else:\n prefixes = (\"train\", \"val\")\n history_end = base.VALIDATION_END\n candidate_name = \"test_eligible_candidates.npz\"\n state_name = \"test_preference_state.parquet\"\n eligibility = CandidateSet.read(data / candidate_name)\n if not np.array_equal(eligibility.item_ids, item_ids):\n raise RuntimeError(\"catalog and candidate artifact item order differ\")\n\n explicit_by_user = base.load_explicit_events(data, prefixes, item_index)\n inference_likes, inference_dislikes, like_counts, dislike_counts = (\n base.load_inference_state(\n data / state_name,\n item_index,\n eligibility.uids,\n n_items,\n )\n )\n inference_rows = {int(uid): row for row, uid in enumerate(eligibility.uids)}\n inference_user_features = np.zeros((len(eligibility.uids), 6), dtype=np.float32)\n inference_sequence_rows = np.full(len(eligibility.uids), -1, dtype=np.int32)\n\n # Snapshot zero is the shared empty explicit state.\n liked_states = [np.full(base.LIKE_ITEMS, n_items, dtype=np.uint16)]\n disliked_states = [\n np.full(base.DISLIKE_ITEMS, n_items, dtype=np.uint16)\n ]\n state_counts: list[tuple[int, int]] = [(0, 0)]\n user_ids: list[int] = []\n offsets = [0]\n timestamp_parts: list[np.ndarray] = []\n item_parts: list[np.ndarray] = []\n event_parts: list[np.ndarray] = []\n activity_parts: list[np.ndarray] = []\n state_parts: list[np.ndarray] = []\n\n listen_paths = [data / f\"{prefix}_listens.parquet\" for prefix in prefixes]\n started = time.monotonic()\n for seen_users, (uid, listens) in enumerate(\n base.merge_listen_streams(listen_paths, item_index), start=1\n ):\n parts = build_sequence_parts(\n listens,\n explicit_by_user.get(uid, base.empty_explicit_events()),\n n_items,\n liked_states,\n disliked_states,\n state_counts,\n )\n if parts is None:\n continue\n sequence_row = len(user_ids)\n user_ids.append(uid)\n timestamp_parts.append(parts[0].astype(np.uint32, copy=False))\n item_parts.append(parts[1])\n event_parts.append(parts[2])\n activity_parts.append(parts[3])\n state_parts.append(parts[4])\n offsets.append(offsets[-1] + len(parts[1]))\n inference_row = inference_rows.get(uid)\n if inference_row is not None:\n inference_sequence_rows[inference_row] = sequence_row\n inference_user_features[inference_row] = final_user_features(\n parts[0],\n parts[1],\n parts[2],\n history_end,\n int(like_counts[inference_row]),\n int(dislike_counts[inference_row]),\n )\n if seen_users % 1_000 == 0:\n log(\n f\"prepared users={seen_users:,} tokens={offsets[-1]:,} \"\n f\"states={len(liked_states):,} \"\n f\"elapsed={time.monotonic() - started:.1f}s\"\n )\n\n missing = np.flatnonzero(inference_sequence_rows < 0)\n if len(missing):\n inference_user_features[missing, 4] = np.log1p(like_counts[missing]) / 6.0\n inference_user_features[missing, 5] = (\n np.log1p(dislike_counts[missing]) / 4.0\n )\n log(f\"target users without qualifying catalog sequence={len(missing):,}\")\n\n prepared = SequenceData(\n item_ids=item_ids,\n item_features=base.build_item_features(catalog),\n user_ids=np.asarray(user_ids, dtype=np.int64),\n offsets=np.asarray(offsets, dtype=np.int64),\n sequence_timestamps=np.concatenate(timestamp_parts),\n sequence_items=np.concatenate(item_parts),\n event_features=np.concatenate(event_parts),\n activity_features=np.concatenate(activity_parts),\n state_ids=np.concatenate(state_parts),\n liked_states=np.stack(liked_states),\n disliked_states=np.stack(disliked_states),\n state_counts=np.asarray(state_counts, dtype=np.int32),\n inference_user_rows=inference_sequence_rows,\n inference_liked_items=inference_likes,\n inference_disliked_items=inference_dislikes,\n inference_user_features=inference_user_features,\n )\n log(\n f\"prepared stage={stage} sequence_users={len(prepared.user_ids):,} \"\n f\"tokens={len(prepared.sequence_items):,} \"\n f\"next_item_targets={prepared.target_count:,} \"\n f\"states={len(prepared.liked_states):,}\"\n )\n return prepared, eligibility\n\n\ndef cache_metadata(stage: str, config: Config) -> dict[str, object]:\n return {\n \"cache_version\": CACHE_VERSION,\n \"stage\": stage,\n \"positive_listen_threshold\": base.LISTEN_POSITIVE_THRESHOLD,\n \"profile_lookback_days\": base.PROFILE_LOOKBACK_DAYS,\n \"event_time_feature\": \"exp-negative-gap-over-60-days\",\n }\n\n\ndef save_cache(\n path: Path, prepared: SequenceData, stage: str, config: Config\n) -> None:\n path.parent.mkdir(parents=True, exist_ok=True)\n np.savez(\n path,\n metadata=np.asarray(json.dumps(cache_metadata(stage, config), sort_keys=True)),\n **prepared.__dict__,\n )\n log(f\"saved public-derived full-sequence cache: {path}\")\n\n\ndef load_cache(path: Path, stage: str, config: Config) -> SequenceData:\n with np.load(path, allow_pickle=False) as artifact:\n actual = json.loads(str(artifact[\"metadata\"].item()))\n expected = cache_metadata(stage, config)\n if actual != expected:\n raise RuntimeError(f\"sequence cache differs: {actual} != {expected}\")\n values = {\n field: artifact[field].copy()\n for field in SequenceData.__dataclass_fields__\n }\n prepared = SequenceData(**values)\n log(\n f\"loaded full-sequence cache: tokens={len(prepared.sequence_items):,} \"\n f\"targets={prepared.target_count:,}\"\n )\n return prepared\n\n\ndef load_or_prepare(\n public: Path,\n stage: str,\n config: Config,\n cache: Path | None,\n) -> tuple[SequenceData, CandidateSet]:\n candidate_name = (\n \"validation_eligible_candidates.npz\"\n if stage == \"validation\"\n else \"test_eligible_candidates.npz\"\n )\n eligibility = CandidateSet.read(public / \"data\" / candidate_name)\n if cache is not None and cache.is_file():\n prepared = load_cache(cache, stage, config)\n if not np.array_equal(prepared.item_ids, eligibility.item_ids):\n raise RuntimeError(\"cached catalog differs from candidate artifact\")\n return prepared, eligibility\n prepared, built_eligibility = prepare_data(public, stage, config)\n if cache is not None:\n save_cache(cache, prepared, stage, config)\n return prepared, built_eligibility\n\n\ndef build_item_correction(\n prepared: SequenceData,\n config: Config,\n target_starts: np.ndarray,\n target_counts: np.ndarray,\n) -> torch.Tensor:\n \"\"\"Estimate in-batch propensities from the selected training targets.\"\"\"\n raise RuntimeError(\"chronological target partition produced negative counts\")\n if not np.array_equal(\n window_starts + training_counts + validation_counts, total_targets\n ):\n raise RuntimeError(\"chronological target window is not a final contiguous suffix\")\n return window_starts\n\n\ndef chronological_target_partition(\n prepared: SequenceData,\n validation_fraction: float,\n max_train_targets_per_user: int,\n max_validation_targets_per_user: int,\n) -> TargetPartition:\n \"\"\"Select a recent contiguous window with a final out-of-time BCE suffix.\"\"\"\n totals = np.maximum(prepared.lengths - 1, 0).astype(np.int64)\n validation = np.floor(totals * validation_fraction).astype(np.int64)\n validation[(totals >= 2) & (validation == 0)] = 1\n if max_validation_targets_per_user:\n validation = np.minimum(validation, max_validation_targets_per_user)\n\n history_training = totals - validation\n training = history_training.copy()\n if max_train_targets_per_user:\n training = np.minimum(training, max_train_targets_per_user)\n window_starts = retained_target_window_starts(totals, validation, training)\n return TargetPartition(\n window_starts=window_starts,\n training_counts=training,\n validation_counts=validation,\n history_training_counts=history_training,\n )\n\n\ndef load_organic_like_outcomes(\n public: Path, stage: str, item_ids: np.ndarray\n) -> dict[int, dict[int, np.ndarray]]:\n \"\"\"Load mapped organic-like timestamps from public fitting history.\"\"\"\n prefixes = (\"train\",) if stage == \"validation\" else (\"train\", \"val\")\n frames = [\n pd.read_parquet(\n public / \"data\" / f\"{prefix}_likes.parquet\",\n columns=[\"uid\", \"timestamp\", \"item_id\", \"is_organic\"],\n )\n for prefix in prefixes\n ]\n likes = pd.concat(frames, ignore_index=True)\n likes = likes[likes.is_organic == 1].copy()\n mapped = pd.Index(item_ids).get_indexer(\n likes.item_id.to_numpy(dtype=np.int64)\n )\n likes = likes.loc[mapped >= 0, [\"uid\", \"timestamp\"]].copy()\n likes[\"item\"] = mapped[mapped >= 0].astype(np.int32, copy=False)\n likes = likes.sort_values([\"uid\", \"item\", \"timestamp\"], kind=\"stable\")\n nested: dict[int, dict[int, list[int]]] = {}\n for raw_uid, raw_timestamp, raw_item in likes.itertuples(\n index=False, name=None\n ):\n nested.setdefault(int(raw_uid), {}).setdefault(int(raw_item), []).append(\n int(raw_timestamp)\n )\n result = {\n uid: {\n item: np.asarray(timestamps, dtype=np.int64)\n for item, timestamps in items.items()\n }\n for uid, items in nested.items()\n }\n log(\n f\"loaded organic-like outcomes: rows={len(likes):,} \"\n f\"users={len(result):,}\"\n )\n return result\n\n\ndef build_target_weights(\n public: Path,\n stage: str,\n prepared: SequenceData,\n training_counts: np.ndarray,\n config: Config,\n) -> np.ndarray:\n \"\"\"Build nonzero per-token weights without dropping adjacent targets.\"\"\"\n if config.target_weighting == \"uniform\":\n weights = np.ones(len(prepared.sequence_items), dtype=np.float32)\n else:\n weights = np.full(\n len(prepared.sequence_items),\n config.ordinary_target_weight,\n dtype=np.float32,\n )\n organic_strong = (\n (prepared.event_features[:, 0] > 0.5)\n & (prepared.event_features[:, 1] >= 0.8)\n )\n weights[organic_strong] = config.organic_strong_target_weight\n if config.target_weighting == \"discovery-graded\":\n like_outcomes = load_organic_like_outcomes(\n public, stage, prepared.item_ids\n )\n history_end = (\n base.TRAIN_END if stage == \"validation\" else base.VALIDATION_END\n )\n horizon = config.discovery_horizon_days * base.DAY\n grade_three = 0\n for user_row, uid in enumerate(prepared.user_ids):\n start = int(prepared.offsets[user_row])\n end = int(prepared.offsets[user_row + 1])\n if end - start < 2:\n continue\n last_training_target = start + int(training_counts[user_row])\n first_validation_target = last_training_target + 1\n split_timestamp = (\n int(prepared.sequence_timestamps[first_validation_target])\n if first_validation_target < end\n else history_end\n )\n user_likes = like_outcomes.get(int(uid), {})\n seen = {int(prepared.sequence_items[start])}\n for position in range(start + 1, end):\n item = int(prepared.sequence_items[position])\n novel = item not in seen\n seen.add(item)\n if not novel:\n # Repeats remain training examples, but they cannot be\n # eligible discovery outcomes at the corresponding\n # cutoff and therefore keep only the ordinary weight.\n weights[position] = config.ordinary_target_weight\n continue\n timestamps = user_likes.get(item)\n if timestamps is None:\n continue\n timestamp = int(prepared.sequence_timestamps[position])\n upper = min(\n timestamp + horizon,\n split_timestamp\n if position <= last_training_target\n else history_end,\n )\n outcome = int(np.searchsorted(timestamps, timestamp, side=\"left\"))\n if outcome < len(timestamps) and int(timestamps[outcome]) < upper:\n weights[position] = config.organic_like_target_weight\n grade_three += 1\n log(\n f\"grade-3 first-encounter targets={grade_three:,} \"\n f\"horizon_days={config.discovery_horizon_days}\"\n )\n log(\n f\"target weighting={config.target_weighting} \"\n f\"min={weights.min():.3f} mean={weights.mean():.3f} \"\n f\"max={weights.max():.3f}\"\n )\n return weights\n\n\ndef build_dense_block(\n prepared: SequenceData,\n target_weights: np.ndarray,\n users: np.ndarray,\n window_starts: np.ndarray,\n process_counts: np.ndarray,\n score_starts: np.ndarray,\n start: int,\n steps: int,\n config: Config,\n) -> tuple[np.ndarray, ...]:\n \"\"\"Build one causal sequence block and mark the target rows to score.\"\"\"\n batch_size = len(users)\n padding_item = len(prepared.item_ids)\n input_items = np.full((batch_size, steps), padding_item, dtype=np.uint16)\n event_features = np.zeros((batch_size, steps, 3), dtype=np.float16)\n activity_features = np.zeros((batch_size, steps, 4), dtype=np.float16)\n state_ids = np.zeros((batch_size, steps), dtype=np.uint32)\n targets = np.zeros((batch_size, steps), dtype=np.uint16)\n weights = np.ones((batch_size, steps), dtype=np.float32)\n scored = np.zeros((batch_size, steps), dtype=bool)\n histories = np.full(\n (batch_size, steps, config.bptt_steps),\n padding_item,\n dtype=np.uint16,\n )\n processed = np.zeros(batch_size, dtype=np.int32)\n\n lengths = prepared.lengths\n for row, user_row in enumerate(users):\n count = min(steps, max(int(process_counts[row]) - start, 0))\n if not count:\n continue\n offset = int(prepared.offsets[user_row])\n window_start = int(window_starts[row])\n absolute_start = window_start + start\n positions = slice(\n offset + absolute_start,\n offset + absolute_start + count,\n )\n target_positions = slice(\n offset + absolute_start + 1,\n offset + absolute_start + count + 1,\n )\n input_items[row, :count] = prepared.sequence_items[positions]\n event_features[row, :count] = prepared.event_features[positions]\n activity_features[row, :count] = prepared.activity_features[positions]\n state_ids[row, :count] = prepared.state_ids[positions]\n targets[row, :count] = prepared.sequence_items[target_positions]\n weights[row, :count] = target_weights[target_positions]\n score_from = min(count, max(int(score_starts[row]) - start, 0))\n", "stderr": "", "aggregated_output": " event_features[row, :count] = prepared.event_features[positions]\n activity_features[row, :count] = prepared.activity_features[positions]\n state_ids[row, :count] = prepared.state_ids[positions]\n targets[row, :count] = prepared.sequence_items[target_positions]\n weights[row, :count] = target_weights[target_positions]\n score_from = min(count, max(int(score_starts[row]) - start, 0))\n scored[row, score_from:count] = True\n processed[row] = count\n user_sequence = prepared.sequence_items[\n offset : offset + int(lengths[user_row])\n ]\n histories[row, :count] = history_windows(\n user_sequence,\n absolute_start,\n count,\n config.bptt_steps,\n padding_item,\n )\n return (\n input_items,\n event_features,\n activity_features,\n state_ids,\n targets,\n scored,\n histories,\n processed,\n weights,\n )\n\n\ndef score_target_microbatches(\n model: base.SequentialTwoTower,\n prepared: SequenceData,\n config: Config,\n sequence_vectors: torch.Tensor,\n flat_states: np.ndarray,\n flat_activity: np.ndarray,\n positive_items: torch.Tensor,\n negatives: torch.Tensor,\n negative_weights: torch.Tensor,\n sample_weights: np.ndarray,\n device: torch.device,\n backward: bool,\n) -> tuple[dict[str, float], torch.Tensor | None]:\n \"\"\"Compute one logical block's exact BCE in bounded-memory slices.\"\"\"\n target_count = len(positive_items)\n total_weight = float(sample_weights.sum())\n if total_weight <= 0:\n raise RuntimeError(\"target block has no positive sample weight\")\n sequence_gradient = torch.zeros_like(sequence_vectors) if backward else None\n statistics = {\n \"loss_sum\": 0.0,\n \"positive_sum\": 0.0,\n \"negative_sum\": 0.0,\n \"pair_correct\": 0.0,\n \"weight_sum\": 0.0,\n }\n for begin in range(0, target_count, config.loss_microbatch_size):\n end = min(begin + config.loss_microbatch_size, target_count)\n selected_states = flat_states[begin:end]\n if backward:\n sequence_input = (\n sequence_vectors[begin:end].detach().requires_grad_(True)\n )\n else:\n sequence_input = sequence_vectors[begin:end]\n liked_vectors, disliked_vectors, _ = pool_explicit_states(\n model, prepared, selected_states, device\n )\n counts = prepared.state_counts[selected_states]\n numeric = np.zeros((end - begin, 6), dtype=np.float32)\n numeric[:, :4] = flat_activity[begin:end]\n numeric[:, 4] = np.log1p(counts[:, 0]) / 6.0\n numeric[:, 5] = np.log1p(counts[:, 1]) / 4.0\n query_vectors = user_queries(\n model,\n sequence_input,\n liked_vectors,\n disliked_vectors,\n torch.from_numpy(numeric).to(device),\n )\n positive_vectors, negative_vectors = candidate_vectors(\n model,\n positive_items[begin:end],\n negatives[begin:end],\n )\n positive_logits = (query_vectors * positive_vectors).sum(dim=1)\n negative_logits = torch.einsum(\n \"bd,bkd->bk\", query_vectors, negative_vectors\n )\n positive_loss = F.softplus(-positive_logits)\n negative_loss = corrected_negative_loss(\n negative_logits, negative_weights[begin:end], config\n )\n selected_weights = torch.from_numpy(\n sample_weights[begin:end].astype(np.float32, copy=False)\n ).to(device)\n loss_sum = (\n selected_weights * (positive_loss + negative_loss) / 2.0\n ).sum()\n if not bool(torch.isfinite(loss_sum)):\n raise RuntimeError(\"dense next-item training produced non-finite loss\")\n if backward:\n (loss_sum / total_weight).backward()\n if sequence_input.grad is None:\n raise RuntimeError(\"sequence microbatch did not produce a gradient\")\n sequence_gradient[begin:end] = sequence_input.grad\n statistics[\"loss_sum\"] += float(loss_sum.detach().cpu())\n statistics[\"positive_sum\"] += float(positive_logits.detach().sum().cpu())\n statistics[\"negative_sum\"] += float(negative_logits.detach().sum().cpu())\n statistics[\"pair_correct\"] += float(\n (positive_logits.detach()[:, None] > negative_logits.detach()).sum().cpu()\n )\n statistics[\"weight_sum\"] += float(selected_weights.sum().detach().cpu())\n return statistics, sequence_gradient\n\n\ndef release_accelerator_cache(device: torch.device) -> None:\n if device.type == \"mps\":\n torch.mps.empty_cache()\n\n\ndef run_training_epoch(\n model: base.SequentialTwoTower,\n optimizer: torch.optim.Optimizer,\n prepared: SequenceData,\n config: Config,\n target_weights: np.ndarray,\n window_starts: np.ndarray,\n target_counts: np.ndarray,\n item_correction: torch.Tensor,\n known_positive_packed: np.ndarray | None,\n generator: torch.Generator,\n device: torch.device,\n epoch: int,\n) -> dict[str, float]:\n model.train()\n train_users = np.flatnonzero(target_counts > 0)\n sorted_users = train_users[\n np.argsort(target_counts[train_users], kind=\"stable\")\n ]\n groups = [\n sorted_users[start : start + config.user_batch_size]\n for start in range(0, len(sorted_users), config.user_batch_size)\n ]\n group_order = torch.randperm(len(groups), generator=generator).numpy()\n negative_count = config.uniform_negatives + config.inbatch_negatives\n total_loss = 0.0\n total_targets = 0\n total_weight = 0.0\n total_positive = 0.0\n total_negative = 0.0\n total_pair_correct = 0.0\n batches = 0\n started = time.monotonic()\n\n for group_number in group_order:\n users = groups[int(group_number)]\n group_counts = target_counts[users]\n hidden = torch.zeros(\n 1, len(users), config.embedding_dim, device=device\n )\n max_targets = int(group_counts.max())\n for start in range(0, max_targets, config.bptt_steps):\n steps = min(config.bptt_steps, max_targets - start)\n block = build_dense_block(\n prepared,\n target_weights,\n users,\n window_starts[users],\n group_counts,\n np.zeros(len(users), dtype=np.int64),\n start,\n steps,\n config,\n )\n sequence_outputs, _ = event_sequence(\n model,\n torch.from_numpy(block[0].astype(np.int64)).to(device),\n torch.from_numpy(block[1].astype(np.float32)).to(device),\n hidden,\n )\n hidden = torch.stack(\n [\n sequence_outputs[row, count - 1]\n if count\n else hidden[0, row]\n for row, count in enumerate(block[7])\n ]\n ).unsqueeze(0).detach()\n flat_scored = block[5].reshape(-1)\n if not np.any(flat_scored):\n continue\n mask = torch.from_numpy(flat_scored).to(device)\n sequence_vectors = sequence_outputs.reshape(\n -1, config.embedding_dim\n )[mask]\n flat_states = block[3].reshape(-1)[flat_scored]\n positive_items = torch.from_numpy(\n block[4].reshape(-1)[flat_scored].astype(np.int64)\n ).to(device)\n known_history = torch.from_numpy(\n block[6].reshape(-1, config.bptt_steps)[flat_scored].astype(\n np.int64\n )\n ).to(device)\n liked_items = torch.from_numpy(\n prepared.liked_states[flat_states].astype(np.int64)\n ).to(device)\n flat_user_rows = np.broadcast_to(\n users[:, None], block[5].shape\n ).reshape(-1)[flat_scored]\n negatives, negative_weights = draw_training_negatives(\n positive_items,\n known_history,\n liked_items,\n flat_user_rows,\n known_positive_packed,\n prepared,\n config,\n item_correction,\n generator,\n device,\n )\n optimizer.zero_grad(set_to_none=True)\n statistics, sequence_gradient = score_target_microbatches(\n model,\n prepared,\n config,\n sequence_vectors,\n flat_states,\n block[2].reshape(-1, 4)[flat_scored].astype(np.float32),\n positive_items,\n negatives,\n negative_weights,\n block[8].reshape(-1)[flat_scored],\n device,\n backward=True,\n )\n if sequence_gradient is None:\n raise RuntimeError(\"training block omitted its sequence gradient\")\n sequence_vectors.backward(sequence_gradient)\n nn.utils.clip_grad_norm_(model.parameters(), config.gradient_clip)\n optimizer.step()\n\n count = len(positive_items)\n total_loss += statistics[\"loss_sum\"]\n total_targets += count\n total_weight += statistics[\"weight_sum\"]\n total_positive += statistics[\"positive_sum\"]\n total_negative += statistics[\"negative_sum\"]\n total_pair_correct += statistics[\"pair_correct\"]\n batches += 1\n if batches % 25 == 0:\n release_accelerator_cache(device)\n if batches % 250 == 0:\n batch_bce = statistics[\"loss_sum\"] / max(\n statistics[\"weight_sum\"], 1.0e-12\n )\n running_bce = total_loss / max(total_weight, 1.0e-12)\n log(\n f\"epoch={epoch}/{config.epochs} batches={batches:,} \"\n f\"targets={total_targets:,} \"\n f\"batch_bce={batch_bce:.6f} \"\n f\"running_bce={running_bce:.6f} \"\n f\"elapsed={time.monotonic() - started:.1f}s\"\n )\n\n return {\n \"epoch\": float(epoch),\n \"loss\": total_loss / max(total_weight, 1.0e-12),\n \"positive_logit\": total_positive / max(total_targets, 1),\n \"negative_logit\": total_negative / max(total_targets * negative_count, 1),\n \"pair_accuracy\": total_pair_correct\n / max(total_targets * negative_count, 1),\n \"targets\": float(total_targets),\n \"target_weight_sum\": total_weight,\n \"batches\": float(batches),\n \"seconds\": time.monotonic() - started,\n }\n\n\n@torch.no_grad()\ndef evaluate_validation_bce(\n model: base.SequentialTwoTower,\n prepared: SequenceData,\n config: Config,\n target_weights: np.ndarray,\n window_starts: np.ndarray,\n training_counts: np.ndarray,\n validation_counts: np.ndarray,\n item_correction: torch.Tensor,\n known_positive_packed: np.ndarray | None,\n device: torch.device,\n) -> dict[str, float]:\n \"\"\"Measure deterministic BCE on each user's chronological target suffix.\"\"\"\n model.eval()\n totals = training_counts + validation_counts\n users_with_validation = np.flatnonzero(validation_counts > 0)\n ordered = users_with_validation[\n np.argsort(totals[users_with_validation], kind=\"stable\")\n ]\n groups = [\n ordered[start : start + config.user_batch_size]\n for start in range(0, len(ordered), config.user_batch_size)\n ]\n generator = torch.Generator(device=\"cpu\").manual_seed(config.seed + 20_000)\n total_loss = 0.0\n total_targets = 0\n total_weight = 0.0\n started = time.monotonic()\n\n for group_number, users in enumerate(groups, start=1):\n group_totals = totals[users]\n group_starts = training_counts[users]\n hidden = torch.zeros(\n 1, len(users), config.embedding_dim, device=device\n )\n max_targets = int(group_totals.max())\n for start in range(0, max_targets, config.bptt_steps):\n steps = min(config.bptt_steps, max_targets - start)\n block = build_dense_block(\n prepared,\n target_weights,\n users,\n window_starts[users],\n group_totals,\n group_starts,\n start,\n steps,\n config,\n )\n sequence_outputs, _ = event_sequence(\n model,\n torch.from_numpy(block[0].astype(np.int64)).to(device),\n torch.from_numpy(block[1].astype(np.float32)).to(device),\n hidden,\n )\n hidden = torch.stack(\n [\n sequence_outputs[row, count - 1]\n if count\n else hidden[0, row]\n for row, count in enumerate(block[7])\n ]\n ).unsqueeze(0)\n flat_scored = block[5].reshape(-1)\n if not np.any(flat_scored):\n continue\n mask = torch.from_numpy(flat_scored).to(device)\n sequence_vectors = sequence_outputs.reshape(\n -1, config.embedding_dim\n )[mask]\n flat_states = block[3].reshape(-1)[flat_scored]\n positive_items = torch.from_numpy(\n block[4].reshape(-1)[flat_scored].astype(np.int64)\n ).to(device)\n known_history = torch.from_numpy(\n block[6].reshape(-1, config.bptt_steps)[flat_scored].astype(\n np.int64\n )\n ).to(device)\n liked_items = torch.from_numpy(\n prepared.liked_states[flat_states].astype(np.int64)\n ).to(device)\n flat_user_rows = np.broadcast_to(\n users[:, None], block[5].shape\n ).reshape(-1)[flat_scored]\n negatives, negative_weights = draw_training_negatives(\n positive_items,\n known_history,\n liked_items,\n flat_user_rows,\n known_positive_packed,\n prepared,\n config,\n item_correction,\n generator,\n device,\n )\n statistics, _ = score_target_microbatches(\n model,\n prepared,\n config,\n sequence_vectors,\n flat_states,\n block[2].reshape(-1, 4)[flat_scored].astype(np.float32),\n positive_items,\n negatives,\n negative_weights,\n block[8].reshape(-1)[flat_scored],\n device,\n backward=False,\n )\n total_loss += statistics[\"loss_sum\"]\n total_targets += len(positive_items)\n total_weight += statistics[\"weight_sum\"]\n if group_number % 25 == 0:\n release_accelerator_cache(device)\n return {\n \"validation_loss\": total_loss / max(total_weight, 1.0e-12),\n \"validation_targets\": float(total_targets),\n \"validation_target_weight_sum\": total_weight,\n \"validation_seconds\": time.monotonic() - started,\n }\n\n\ndef snapshot_model(model: nn.Module) -> dict[str, torch.Tensor]:\n return {\n name: value.detach().cpu().clone()\n for name, value in model.state_dict().items()\n }\n\n\ndef save_epoch_checkpoint(\n checkpoint_dir: Path,\n epoch: int,\n model_state: dict[str, torch.Tensor],\n config: Config,\n diagnostics: dict[str, float],\n optimizer: torch.optim.Optimizer,\n generator: torch.Generator,\n) -> Path:\n checkpoint_dir.mkdir(parents=True, exist_ok=True)\n path = checkpoint_dir / f\"epoch-{epoch:02d}.pt\"\n torch.save(\n {\n \"epoch\": epoch,\n \"config\": asdict(config),\n \"diagnostics\": diagnostics,\n \"model_state\": model_state,\n \"optimizer_state\": optimizer.state_dict(),\n \"generator_state\": generator.get_state(),\n },\n path,\n destination[row, : len(retained)] = retained.astype(np.uint16)\n return liked, disliked, like_counts, dislike_counts\n\n\nclass SequentialTwoTower(nn.Module):\n \"\"\"Order-sensitive user tower and independent catalog-aware item tower.\"\"\"\n\n def __init__(self, item_features: np.ndarray, config: TowerConfig) -> None:\n super().__init__()\n n_items, n_item_features = item_features.shape\n dim = config.embedding_dim\n self.n_items = n_items\n self.context_embedding = nn.Embedding(\n n_items + 1, dim, padding_idx=n_items\n )\n self.event_projection = nn.Sequential(\n nn.Linear(dim + 3, config.hidden_dim),\n nn.GELU(),\n )\n self.sequence_encoder = nn.GRU(\n input_size=config.hidden_dim,\n hidden_size=dim,\n num_layers=1,\n batch_first=True,\n )\n self.user_tower = nn.Sequential(\n nn.Linear(dim * 3 + 6, config.user_hidden_1),\n nn.GELU(),\n nn.Dropout(config.dropout),\n nn.Linear(config.user_hidden_1, config.user_hidden_2),\n nn.GELU(),\n nn.Dropout(config.dropout),\n nn.Linear(config.user_hidden_2, dim),\n )\n self.candidate_embedding = nn.Embedding(n_items, dim)\n self.register_buffer(\n \"item_features\", torch.from_numpy(item_features), persistent=True\n )\n self.item_tower = nn.Sequential(\n nn.Linear(dim + n_item_features, config.item_hidden_1),\n nn.GELU(),\n nn.Dropout(config.dropout),\n nn.Linear(config.item_hidden_1, config.item_hidden_2),\n nn.GELU(),\n nn.Dropout(config.dropout),\n nn.Linear(config.item_hidden_2, dim),\n )\n nn.init.normal_(self.context_embedding.weight, std=0.02)\n nn.init.normal_(self.candidate_embedding.weight, std=0.02)\n with torch.no_grad():\n self.context_embedding.weight[n_items].zero_()\n\n def _mean_context_channel(self, items: torch.Tensor) -> torch.Tensor:\n mask = items.ne(self.n_items)\n vectors = self.context_embedding(items)\n return (vectors * mask.unsqueeze(-1)).sum(dim=1) / mask.sum(\n dim=1, keepdim=True\n ).clamp_min(1)\n\n def encode_items(self, items: torch.Tensor) -> torch.Tensor:\n inputs = torch.cat(\n [self.candidate_embedding(items), self.item_features[items]], dim=1\n )\n return self.item_tower(inputs)\n\n\ndef invalid_negative_mask(\n dislike_count: int,\n) -> np.ndarray:\n start = int(\n np.searchsorted(\n timestamps,\n history_end - base.PROFILE_LOOKBACK_DAYS * base.DAY,\n side=\"left\",\n )\n )\n result = np.zeros(6, dtype=np.float32)\n recent_items = items[start:]\n if len(recent_items):\n result[0] = np.log1p(len(recent_items)) / 8.0\n result[1] = np.log1p(len(np.unique(recent_items))) / 6.0\n result[2] = float(np.mean(event_features[start:, 0]))\n result[3] = float(np.mean(event_features[start:, 1]))\n result[4] = np.log1p(like_count) / 6.0\n result[5] = np.log1p(dislike_count) / 4.0\n return result\n\n\ndef prepare_data(\n public: Path, stage: str, config: Config\n) -> tuple[SequenceData, CandidateSet]:\n data = public / \"data\"\n catalog = pd.read_parquet(data / \"candidate_catalog.parquet\").sort_values(\n \"popularity_rank\"\n )\n item_ids = catalog.item_id.to_numpy(dtype=np.int64, copy=True)\n item_index = pd.Index(item_ids)\n n_items = len(item_ids)\n if n_items >= np.iinfo(np.uint16).max:\n raise RuntimeError(\"uint16 item storage is too small for this catalog\")\n\n if stage == \"validation\":\n prefixes = (\"train\",)\n history_end = base.TRAIN_END\n candidate_name = \"validation_eligible_candidates.npz\"\n state_name = \"validation_preference_state.parquet\"\n else:\n prefixes = (\"train\", \"val\")\n history_end = base.VALIDATION_END\n candidate_name = \"test_eligible_candidates.npz\"\n state_name = \"test_preference_state.parquet\"\n eligibility = CandidateSet.read(data / candidate_name)\n if not np.array_equal(eligibility.item_ids, item_ids):\n raise RuntimeError(\"catalog and candidate artifact item order differ\")\n\n explicit_by_user = base.load_explicit_events(data, prefixes, item_index)\n inference_likes, inference_dislikes, like_counts, dislike_counts = (\n base.load_inference_state(\n data / state_name,\n item_index,\n eligibility.uids,\n n_items,\n )\n )\n inference_rows = {int(uid): row for row, uid in enumerate(eligibility.uids)}\n inference_user_features = np.zeros((len(eligibility.uids), 6), dtype=np.float32)\n inference_sequence_rows = np.full(len(eligibility.uids), -1, dtype=np.int32)\n\n # Snapshot zero is the shared empty explicit state.\n liked_states = [np.full(base.LIKE_ITEMS, n_items, dtype=np.uint16)]\n disliked_states = [\n np.full(base.DISLIKE_ITEMS, n_items, dtype=np.uint16)\n ]\n state_counts: list[tuple[int, int]] = [(0, 0)]\n user_ids: list[int] = []\n offsets = [0]\n timestamp_parts: list[np.ndarray] = []\n item_parts: list[np.ndarray] = []\n event_parts: list[np.ndarray] = []\n activity_parts: list[np.ndarray] = []\n state_parts: list[np.ndarray] = []\n\n listen_paths = [data / f\"{prefix}_listens.parquet\" for prefix in prefixes]\n started = time.monotonic()\n for seen_users, (uid, listens) in enumerate(\n base.merge_listen_streams(listen_paths, item_index), start=1\n ):\n parts = build_sequence_parts(\n listens,\n explicit_by_user.get(uid, base.empty_explicit_events()),\n n_items,\n liked_states,\n disliked_states,\n state_counts,\n )\n if parts is None:\n continue\n sequence_row = len(user_ids)\n user_ids.append(uid)\n timestamp_parts.append(parts[0].astype(np.uint32, copy=False))\n item_parts.append(parts[1])\n event_parts.append(parts[2])\n activity_parts.append(parts[3])\n state_parts.append(parts[4])\n offsets.append(offsets[-1] + len(parts[1]))\n inference_row = inference_rows.get(uid)\n if inference_row is not None:\n inference_sequence_rows[inference_row] = sequence_row\n inference_user_features[inference_row] = final_user_features(\n parts[0],\n parts[1],\n parts[2],\n history_end,\n int(like_counts[inference_row]),\n int(dislike_counts[inference_row]),\n )\n if seen_users % 1_000 == 0:\n log(\n f\"prepared users={seen_users:,} tokens={offsets[-1]:,} \"\n f\"states={len(liked_states):,} \"\n f\"elapsed={time.monotonic() - started:.1f}s\"\n )\n\n missing = np.flatnonzero(inference_sequence_rows < 0)\n if len(missing):\n inference_user_features[missing, 4] = np.log1p(like_counts[missing]) / 6.0\n inference_user_features[missing, 5] = (\n np.log1p(dislike_counts[missing]) / 4.0\n )\n log(f\"target users without qualifying catalog sequence={len(missing):,}\")\n\n prepared = SequenceData(\n item_ids=item_ids,\n item_features=base.build_item_features(catalog),\n user_ids=np.asarray(user_ids, dtype=np.int64),\n offsets=np.asarray(offsets, dtype=np.int64),\n sequence_timestamps=np.concatenate(timestamp_parts),\n sequence_items=np.concatenate(item_parts),\n event_features=np.concatenate(event_parts),\n activity_features=np.concatenate(activity_parts),\n state_ids=np.concatenate(state_parts),\n liked_states=np.stack(liked_states),\n disliked_states=np.stack(disliked_states),\n state_counts=np.asarray(state_counts, dtype=np.int32),\n inference_user_rows=inference_sequence_rows,\n inference_liked_items=inference_likes,\n inference_disliked_items=inference_dislikes,\n inference_user_features=inference_user_features,\n )\n log(\n f\"prepared stage={stage} sequence_users={len(prepared.user_ids):,} \"\n f\"tokens={len(prepared.sequence_items):,} \"\n f\"next_item_targets={prepared.target_count:,} \"\n f\"states={len(prepared.liked_states):,}\"\n )\n return prepared, eligibility\n\n\ndef cache_metadata(stage: str, config: Config) -> dict[str, object]:\n return {\n \"cache_version\": CACHE_VERSION,\n \"stage\": stage,\n \"positive_listen_threshold\": base.LISTEN_POSITIVE_THRESHOLD,\n \"profile_lookback_days\": base.PROFILE_LOOKBACK_DAYS,\n \"event_time_feature\": \"exp-negative-gap-over-60-days\",\n }\n\n\ndef save_cache(\n path: Path, prepared: SequenceData, stage: str, config: Config\n) -> None:\n path.parent.mkdir(parents=True, exist_ok=True)\n np.savez(\n path,\n metadata=np.asarray(json.dumps(cache_metadata(stage, config), sort_keys=True)),\n **prepared.__dict__,\n )\n log(f\"saved public-derived full-sequence cache: {path}\")\n\n\ndef load_cache(path: Path, stage: str, config: Config) -> SequenceData:\n with np.load(path, allow_pickle=False) as artifact:\n actual = json.loads(str(artifact[\"metadata\"].item()))\n expected = cache_metadata(stage, config)\n if actual != expected:\n raise RuntimeError(f\"sequence cache differs: {actual} != {expected}\")\n values = {\n field: artifact[field].copy()\n for field in SequenceData.__dataclass_fields__\n }\n prepared = SequenceData(**values)\n log(\n f\"loaded full-sequence cache: tokens={len(prepared.sequence_items):,} \"\n f\"targets={prepared.target_count:,}\"\n )\n return prepared\n\n\ndef load_or_prepare(\n public: Path,\n stage: str,\n config: Config,\n cache: Path | None,\n) -> tuple[SequenceData, CandidateSet]:\n candidate_name = (\n \"validation_eligible_candidates.npz\"\n if stage == \"validation\"\n else \"test_eligible_candidates.npz\"\n )\n eligibility = CandidateSet.read(public / \"data\" / candidate_name)\n if cache is not None and cache.is_file():\n prepared = load_cache(cache, stage, config)\n if not np.array_equal(prepared.item_ids, eligibility.item_ids):\n raise RuntimeError(\"cached catalog differs from candidate artifact\")\n return prepared, eligibility\n prepared, built_eligibility = prepare_data(public, stage, config)\n if cache is not None:\n save_cache(cache, prepared, stage, config)\n return prepared, built_eligibility\n\n\ndef build_item_correction(\n prepared: SequenceData,\n config: Config,\n target_starts: np.ndarray,\n target_counts: np.ndarray,\n) -> torch.Tensor:\n \"\"\"Estimate in-batch propensities from the selected training targets.\"\"\"\n raise RuntimeError(\"chronological target partition produced negative counts\")\n if not np.array_equal(\n window_starts + training_counts + validation_counts, total_targets\n ):\n raise RuntimeError(\"chronological target window is not a final contiguous suffix\")\n return window_starts\n\n\ndef chronological_target_partition(\n prepared: SequenceData,\n validation_fraction: float,\n max_train_targets_per_user: int,\n max_validation_targets_per_user: int,\n) -> TargetPartition:\n \"\"\"Select a recent contiguous window with a final out-of-time BCE suffix.\"\"\"\n totals = np.maximum(prepared.lengths - 1, 0).astype(np.int64)\n validation = np.floor(totals * validation_fraction).astype(np.int64)\n validation[(totals >= 2) & (validation == 0)] = 1\n if max_validation_targets_per_user:\n validation = np.minimum(validation, max_validation_targets_per_user)\n\n history_training = totals - validation\n training = history_training.copy()\n if max_train_targets_per_user:\n training = np.minimum(training, max_train_targets_per_user)\n window_starts = retained_target_window_starts(totals, validation, training)\n return TargetPartition(\n window_starts=window_starts,\n training_counts=training,\n validation_counts=validation,\n history_training_counts=history_training,\n )\n\n\ndef load_organic_like_outcomes(\n public: Path, stage: str, item_ids: np.ndarray\n) -> dict[int, dict[int, np.ndarray]]:\n \"\"\"Load mapped organic-like timestamps from public fitting history.\"\"\"\n prefixes = (\"train\",) if stage == \"validation\" else (\"train\", \"val\")\n frames = [\n pd.read_parquet(\n public / \"data\" / f\"{prefix}_likes.parquet\",\n columns=[\"uid\", \"timestamp\", \"item_id\", \"is_organic\"],\n )\n for prefix in prefixes\n ]\n likes = pd.concat(frames, ignore_index=True)\n likes = likes[likes.is_organic == 1].copy()\n mapped = pd.Index(item_ids).get_indexer(\n likes.item_id.to_numpy(dtype=np.int64)\n )\n likes = likes.loc[mapped >= 0, [\"uid\", \"timestamp\"]].copy()\n likes[\"item\"] = mapped[mapped >= 0].astype(np.int32, copy=False)\n likes = likes.sort_values([\"uid\", \"item\", \"timestamp\"], kind=\"stable\")\n nested: dict[int, dict[int, list[int]]] = {}\n for raw_uid, raw_timestamp, raw_item in likes.itertuples(\n index=False, name=None\n ):\n nested.setdefault(int(raw_uid), {}).setdefault(int(raw_item), []).append(\n int(raw_timestamp)\n )\n result = {\n uid: {\n item: np.asarray(timestamps, dtype=np.int64)\n for item, timestamps in items.items()\n }\n for uid, items in nested.items()\n }\n log(\n f\"loaded organic-like outcomes: rows={len(likes):,} \"\n f\"users={len(result):,}\"\n )\n return result\n\n\ndef build_target_weights(\n public: Path,\n stage: str,\n prepared: SequenceData,\n training_counts: np.ndarray,\n config: Config,\n) -> np.ndarray:\n \"\"\"Build nonzero per-token weights without dropping adjacent targets.\"\"\"\n if config.target_weighting == \"uniform\":\n weights = np.ones(len(prepared.sequence_items), dtype=np.float32)\n else:\n weights = np.full(\n len(prepared.sequence_items),\n config.ordinary_target_weight,\n dtype=np.float32,\n )\n organic_strong = (\n (prepared.event_features[:, 0] > 0.5)\n & (prepared.event_features[:, 1] >= 0.8)\n )\n weights[organic_strong] = config.organic_strong_target_weight\n if config.target_weighting == \"discovery-graded\":\n like_outcomes = load_organic_like_outcomes(\n public, stage, prepared.item_ids\n )\n history_end = (\n base.TRAIN_END if stage == \"validation\" else base.VALIDATION_END\n )\n horizon = config.discovery_horizon_days * base.DAY\n grade_three = 0\n for user_row, uid in enumerate(prepared.user_ids):\n start = int(prepared.offsets[user_row])\n end = int(prepared.offsets[user_row + 1])\n if end - start < 2:\n continue\n last_training_target = start + int(training_counts[user_row])\n first_validation_target = last_training_target + 1\n split_timestamp = (\n int(prepared.sequence_timestamps[first_validation_target])\n if first_validation_target < end\n else history_end\n )\n user_likes = like_outcomes.get(int(uid), {})\n seen = {int(prepared.sequence_items[start])}\n for position in range(start + 1, end):\n item = int(prepared.sequence_items[position])\n novel = item not in seen\n seen.add(item)\n if not novel:\n # Repeats remain training examples, but they cannot be\n # eligible discovery outcomes at the corresponding\n # cutoff and therefore keep only the ordinary weight.\n weights[position] = config.ordinary_target_weight\n continue\n timestamps = user_likes.get(item)\n if timestamps is None:\n continue\n timestamp = int(prepared.sequence_timestamps[position])\n upper = min(\n timestamp + horizon,\n split_timestamp\n if position <= last_training_target\n else history_end,\n )\n outcome = int(np.searchsorted(timestamps, timestamp, side=\"left\"))\n if outcome < len(timestamps) and int(timestamps[outcome]) < upper:\n weights[position] = config.organic_like_target_weight\n grade_three += 1\n log(\n f\"grade-3 first-encounter targets={grade_three:,} \"\n f\"horizon_days={config.discovery_horizon_days}\"\n )\n log(\n f\"target weighting={config.target_weighting} \"\n f\"min={weights.min():.3f} mean={weights.mean():.3f} \"\n f\"max={weights.max():.3f}\"\n )\n return weights\n\n\ndef build_dense_block(\n prepared: SequenceData,\n target_weights: np.ndarray,\n users: np.ndarray,\n window_starts: np.ndarray,\n process_counts: np.ndarray,\n score_starts: np.ndarray,\n start: int,\n steps: int,\n config: Config,\n) -> tuple[np.ndarray, ...]:\n \"\"\"Build one causal sequence block and mark the target rows to score.\"\"\"\n batch_size = len(users)\n padding_item = len(prepared.item_ids)\n input_items = np.full((batch_size, steps), padding_item, dtype=np.uint16)\n event_features = np.zeros((batch_size, steps, 3), dtype=np.float16)\n activity_features = np.zeros((batch_size, steps, 4), dtype=np.float16)\n state_ids = np.zeros((batch_size, steps), dtype=np.uint32)\n targets = np.zeros((batch_size, steps), dtype=np.uint16)\n weights = np.ones((batch_size, steps), dtype=np.float32)\n scored = np.zeros((batch_size, steps), dtype=bool)\n histories = np.full(\n (batch_size, steps, config.bptt_steps),\n padding_item,\n dtype=np.uint16,\n )\n processed = np.zeros(batch_size, dtype=np.int32)\n\n lengths = prepared.lengths\n for row, user_row in enumerate(users):\n count = min(steps, max(int(process_counts[row]) - start, 0))\n if not count:\n continue\n offset = int(prepared.offsets[user_row])\n window_start = int(window_starts[row])\n absolute_start = window_start + start\n positions = slice(\n offset + absolute_start,\n offset + absolute_start + count,\n )\n target_positions = slice(\n offset + absolute_start + 1,\n offset + absolute_start + count + 1,\n )\n input_items[row, :count] = prepared.sequence_items[positions]\n event_features[row, :count] = prepared.event_features[positions]\n activity_features[row, :count] = prepared.activity_features[positions]\n state_ids[row, :count] = prepared.state_ids[positions]\n targets[row, :count] = prepared.sequence_items[target_positions]\n weights[row, :count] = target_weights[target_positions]\n score_from = min(count, max(int(score_starts[row]) - start, 0))\n", "exit_code": 0, "duration": { "secs": 0, "nanos": 4460 }, "formatted_output": " event_features[row, :count] = prepared.event_features[positions]\n activity_features[row, :count] = prepared.activity_features[positions]\n state_ids[row, :count] = prepared.state_ids[positions]\n targets[row, :count] = prepared.sequence_items[target_positions]\n weights[row, :count] = target_weights[target_positions]\n score_from = min(count, max(int(score_starts[row]) - start, 0))\n scored[row, score_from:count] = True\n processed[row] = count\n user_sequence = prepared.sequence_items[\n offset : offset + int(lengths[user_row])\n ]\n histories[row, :count] = history_windows(\n user_sequence,\n absolute_start,\n count,\n config.bptt_steps,\n padding_item,\n )\n return (\n input_items,\n event_features,\n activity_features,\n state_ids,\n targets,\n scored,\n histories,\n processed,\n weights,\n )\n\n\ndef score_target_microbatches(\n model: base.SequentialTwoTower,\n prepared: SequenceData,\n config: Config,\n sequence_vectors: torch.Tensor,\n flat_states: np.ndarray,\n flat_activity: np.ndarray,\n positive_items: torch.Tensor,\n negatives: torch.Tensor,\n negative_weights: torch.Tensor,\n sample_weights: np.ndarray,\n device: torch.device,\n backward: bool,\n) -> tuple[dict[str, float], torch.Tensor | None]:\n \"\"\"Compute one logical block's exact BCE in bounded-memory slices.\"\"\"\n target_count = len(positive_items)\n total_weight = float(sample_weights.sum())\n if total_weight <= 0:\n raise RuntimeError(\"target block has no positive sample weight\")\n sequence_gradient = torch.zeros_like(sequence_vectors) if backward else None\n statistics = {\n \"loss_sum\": 0.0,\n \"positive_sum\": 0.0,\n \"negative_sum\": 0.0,\n \"pair_correct\": 0.0,\n \"weight_sum\": 0.0,\n }\n for begin in range(0, target_count, config.loss_microbatch_size):\n end = min(begin + config.loss_microbatch_size, target_count)\n selected_states = flat_states[begin:end]\n if backward:\n sequence_input = (\n sequence_vectors[begin:end].detach().requires_grad_(True)\n )\n else:\n sequence_input = sequence_vectors[begin:end]\n liked_vectors, disliked_vectors, _ = pool_explicit_states(\n model, prepared, selected_states, device\n )\n counts = prepared.state_counts[selected_states]\n numeric = np.zeros((end - begin, 6), dtype=np.float32)\n numeric[:, :4] = flat_activity[begin:end]\n numeric[:, 4] = np.log1p(counts[:, 0]) / 6.0\n numeric[:, 5] = np.log1p(counts[:, 1]) / 4.0\n query_vectors = user_queries(\n model,\n sequence_input,\n liked_vectors,\n disliked_vectors,\n torch.from_numpy(numeric).to(device),\n )\n positive_vectors, negative_vectors = candidate_vectors(\n model,\n positive_items[begin:end],\n negatives[begin:end],\n )\n positive_logits = (query_vectors * positive_vectors).sum(dim=1)\n negative_logits = torch.einsum(\n \"bd,bkd->bk\", query_vectors, negative_vectors\n )\n positive_loss = F.softplus(-positive_logits)\n negative_loss = corrected_negative_loss(\n negative_logits, negative_weights[begin:end], config\n )\n selected_weights = torch.from_numpy(\n sample_weights[begin:end].astype(np.float32, copy=False)\n ).to(device)\n loss_sum = (\n selected_weights * (positive_loss + negative_loss) / 2.0\n ).sum()\n if not bool(torch.isfinite(loss_sum)):\n raise RuntimeError(\"dense next-item training produced non-finite loss\")\n if backward:\n (loss_sum / total_weight).backward()\n if sequence_input.grad is None:\n raise RuntimeError(\"sequence microbatch did not produce a gradient\")\n sequence_gradient[begin:end] = sequence_input.grad\n statistics[\"loss_sum\"] += float(loss_sum.detach().cpu())\n statistics[\"positive_sum\"] += float(positive_logits.detach().sum().cpu())\n statistics[\"negative_sum\"] += float(negative_logits.detach().sum().cpu())\n statistics[\"pair_correct\"] += float(\n (positive_logits.detach()[:, None] > negative_logits.detach()).sum().cpu()\n )\n statistics[\"weight_sum\"] += float(selected_weights.sum().detach().cpu())\n return statistics, sequence_gradient\n\n\ndef release_accelerator_cache(device: torch.device) -> None:\n if device.type == \"mps\":\n torch.mps.empty_cache()\n\n\ndef run_training_epoch(\n model: base.SequentialTwoTower,\n optimizer: torch.optim.Optimizer,\n prepared: SequenceData,\n config: Config,\n target_weights: np.ndarray,\n window_starts: np.ndarray,\n target_counts: np.ndarray,\n item_correction: torch.Tensor,\n known_positive_packed: np.ndarray | None,\n generator: torch.Generator,\n device: torch.device,\n epoch: int,\n) -> dict[str, float]:\n model.train()\n train_users = np.flatnonzero(target_counts > 0)\n sorted_users = train_users[\n np.argsort(target_counts[train_users], kind=\"stable\")\n ]\n groups = [\n sorted_users[start : start + config.user_batch_size]\n for start in range(0, len(sorted_users), config.user_batch_size)\n ]\n group_order = torch.randperm(len(groups), generator=generator).numpy()\n negative_count = config.uniform_negatives + config.inbatch_negatives\n total_loss = 0.0\n total_targets = 0\n total_weight = 0.0\n total_positive = 0.0\n total_negative = 0.0\n total_pair_correct = 0.0\n batches = 0\n started = time.monotonic()\n\n for group_number in group_order:\n users = groups[int(group_number)]\n group_counts = target_counts[users]\n hidden = torch.zeros(\n 1, len(users), config.embedding_dim, device=device\n )\n max_targets = int(group_counts.max())\n for start in range(0, max_targets, config.bptt_steps):\n steps = min(config.bptt_steps, max_targets - start)\n block = build_dense_block(\n prepared,\n target_weights,\n users,\n window_starts[users],\n group_counts,\n np.zeros(len(users), dtype=np.int64),\n start,\n steps,\n config,\n )\n sequence_outputs, _ = event_sequence(\n model,\n torch.from_numpy(block[0].astype(np.int64)).to(device),\n torch.from_numpy(block[1].astype(np.float32)).to(device),\n hidden,\n )\n hidden = torch.stack(\n [\n sequence_outputs[row, count - 1]\n if count\n else hidden[0, row]\n for row, count in enumerate(block[7])\n ]\n ).unsqueeze(0).detach()\n flat_scored = block[5].reshape(-1)\n if not np.any(flat_scored):\n continue\n mask = torch.from_numpy(flat_scored).to(device)\n sequence_vectors = sequence_outputs.reshape(\n -1, config.embedding_dim\n )[mask]\n flat_states = block[3].reshape(-1)[flat_scored]\n positive_items = torch.from_numpy(\n block[4].reshape(-1)[flat_scored].astype(np.int64)\n ).to(device)\n known_history = torch.from_numpy(\n block[6].reshape(-1, config.bptt_steps)[flat_scored].astype(\n np.int64\n )\n ).to(device)\n liked_items = torch.from_numpy(\n prepared.liked_states[flat_states].astype(np.int64)\n ).to(device)\n flat_user_rows = np.broadcast_to(\n users[:, None], block[5].shape\n ).reshape(-1)[flat_scored]\n negatives, negative_weights = draw_training_negatives(\n positive_items,\n known_history,\n liked_items,\n flat_user_rows,\n known_positive_packed,\n prepared,\n config,\n item_correction,\n generator,\n device,\n )\n optimizer.zero_grad(set_to_none=True)\n statistics, sequence_gradient = score_target_microbatches(\n model,\n prepared,\n config,\n sequence_vectors,\n flat_states,\n block[2].reshape(-1, 4)[flat_scored].astype(np.float32),\n positive_items,\n negatives,\n negative_weights,\n block[8].reshape(-1)[flat_scored],\n device,\n backward=True,\n )\n if sequence_gradient is None:\n raise RuntimeError(\"training block omitted its sequence gradient\")\n sequence_vectors.backward(sequence_gradient)\n nn.utils.clip_grad_norm_(model.parameters(), config.gradient_clip)\n optimizer.step()\n\n count = len(positive_items)\n total_loss += statistics[\"loss_sum\"]\n total_targets += count\n total_weight += statistics[\"weight_sum\"]\n total_positive += statistics[\"positive_sum\"]\n total_negative += statistics[\"negative_sum\"]\n total_pair_correct += statistics[\"pair_correct\"]\n batches += 1\n if batches % 25 == 0:\n release_accelerator_cache(device)\n if batches % 250 == 0:\n batch_bce = statistics[\"loss_sum\"] / max(\n statistics[\"weight_sum\"], 1.0e-12\n )\n running_bce = total_loss / max(total_weight, 1.0e-12)\n log(\n f\"epoch={epoch}/{config.epochs} batches={batches:,} \"\n f\"targets={total_targets:,} \"\n f\"batch_bce={batch_bce:.6f} \"\n f\"running_bce={running_bce:.6f} \"\n f\"elapsed={time.monotonic() - started:.1f}s\"\n )\n\n return {\n \"epoch\": float(epoch),\n \"loss\": total_loss / max(total_weight, 1.0e-12),\n \"positive_logit\": total_positive / max(total_targets, 1),\n \"negative_logit\": total_negative / max(total_targets * negative_count, 1),\n \"pair_accuracy\": total_pair_correct\n / max(total_targets * negative_count, 1),\n \"targets\": float(total_targets),\n \"target_weight_sum\": total_weight,\n \"batches\": float(batches),\n \"seconds\": time.monotonic() - started,\n }\n\n\n@torch.no_grad()\ndef evaluate_validation_bce(\n model: base.SequentialTwoTower,\n prepared: SequenceData,\n config: Config,\n target_weights: np.ndarray,\n window_starts: np.ndarray,\n training_counts: np.ndarray,\n validation_counts: np.ndarray,\n item_correction: torch.Tensor,\n known_positive_packed: np.ndarray | None,\n device: torch.device,\n) -> dict[str, float]:\n \"\"\"Measure deterministic BCE on each user's chronological target suffix.\"\"\"\n model.eval()\n totals = training_counts + validation_counts\n users_with_validation = np.flatnonzero(validation_counts > 0)\n ordered = users_with_validation[\n np.argsort(totals[users_with_validation], kind=\"stable\")\n ]\n groups = [\n ordered[start : start + config.user_batch_size]\n for start in range(0, len(ordered), config.user_batch_size)\n ]\n generator = torch.Generator(device=\"cpu\").manual_seed(config.seed + 20_000)\n total_loss = 0.0\n total_targets = 0\n total_weight = 0.0\n started = time.monotonic()\n\n for group_number, users in enumerate(groups, start=1):\n group_totals = totals[users]\n group_starts = training_counts[users]\n hidden = torch.zeros(\n 1, len(users), config.embedding_dim, device=device\n )\n max_targets = int(group_totals.max())\n for start in range(0, max_targets, config.bptt_steps):\n steps = min(config.bptt_steps, max_targets - start)\n block = build_dense_block(\n prepared,\n target_weights,\n users,\n window_starts[users],\n group_totals,\n group_starts,\n start,\n steps,\n config,\n )\n sequence_outputs, _ = event_sequence(\n model,\n torch.from_numpy(block[0].astype(np.int64)).to(device),\n torch.from_numpy(block[1].astype(np.float32)).to(device),\n hidden,\n )\n hidden = torch.stack(\n [\n sequence_outputs[row, count - 1]\n if count\n else hidden[0, row]\n for row, count in enumerate(block[7])\n ]\n ).unsqueeze(0)\n flat_scored = block[5].reshape(-1)\n if not np.any(flat_scored):\n continue\n mask = torch.from_numpy(flat_scored).to(device)\n sequence_vectors = sequence_outputs.reshape(\n -1, config.embedding_dim\n )[mask]\n flat_states = block[3].reshape(-1)[flat_scored]\n positive_items = torch.from_numpy(\n block[4].reshape(-1)[flat_scored].astype(np.int64)\n ).to(device)\n known_history = torch.from_numpy(\n block[6].reshape(-1, config.bptt_steps)[flat_scored].astype(\n np.int64\n )\n ).to(device)\n liked_items = torch.from_numpy(\n prepared.liked_states[flat_states].astype(np.int64)\n ).to(device)\n flat_user_rows = np.broadcast_to(\n users[:, None], block[5].shape\n ).reshape(-1)[flat_scored]\n negatives, negative_weights = draw_training_negatives(\n positive_items,\n known_history,\n liked_items,\n flat_user_rows,\n known_positive_packed,\n prepared,\n config,\n item_correction,\n generator,\n device,\n )\n statistics, _ = score_target_microbatches(\n model,\n prepared,\n config,\n sequence_vectors,\n flat_states,\n block[2].reshape(-1, 4)[flat_scored].astype(np.float32),\n positive_items,\n negatives,\n negative_weights,\n block[8].reshape(-1)[flat_scored],\n device,\n backward=False,\n )\n total_loss += statistics[\"loss_sum\"]\n total_targets += len(positive_items)\n total_weight += statistics[\"weight_sum\"]\n if group_number % 25 == 0:\n release_accelerator_cache(device)\n return {\n \"validation_loss\": total_loss / max(total_weight, 1.0e-12),\n \"validation_targets\": float(total_targets),\n \"validation_target_weight_sum\": total_weight,\n \"validation_seconds\": time.monotonic() - started,\n }\n\n\ndef snapshot_model(model: nn.Module) -> dict[str, torch.Tensor]:\n return {\n name: value.detach().cpu().clone()\n for name, value in model.state_dict().items()\n }\n\n\ndef save_epoch_checkpoint(\n checkpoint_dir: Path,\n epoch: int,\n model_state: dict[str, torch.Tensor],\n config: Config,\n diagnostics: dict[str, float],\n optimizer: torch.optim.Optimizer,\n generator: torch.Generator,\n) -> Path:\n checkpoint_dir.mkdir(parents=True, exist_ok=True)\n path = checkpoint_dir / f\"epoch-{epoch:02d}.pt\"\n torch.save(\n {\n \"epoch\": epoch,\n \"config\": asdict(config),\n \"diagnostics\": diagnostics,\n \"model_state\": model_state,\n \"optimizer_state\": optimizer.state_dict(),\n \"generator_state\": generator.get_state(),\n },\n path,\n destination[row, : len(retained)] = retained.astype(np.uint16)\n return liked, disliked, like_counts, dislike_counts\n\n\nclass SequentialTwoTower(nn.Module):\n \"\"\"Order-sensitive user tower and independent catalog-aware item tower.\"\"\"\n\n def __init__(self, item_features: np.ndarray, config: TowerConfig) -> None:\n super().__init__()\n n_items, n_item_features = item_features.shape\n dim = config.embedding_dim\n self.n_items = n_items\n self.context_embedding = nn.Embedding(\n n_items + 1, dim, padding_idx=n_items\n )\n self.event_projection = nn.Sequential(\n nn.Linear(dim + 3, config.hidden_dim),\n nn.GELU(),\n )\n self.sequence_encoder = nn.GRU(\n input_size=config.hidden_dim,\n hidden_size=dim,\n num_layers=1,\n batch_first=True,\n )\n self.user_tower = nn.Sequential(\n nn.Linear(dim * 3 + 6, config.user_hidden_1),\n nn.GELU(),\n nn.Dropout(config.dropout),\n nn.Linear(config.user_hidden_1, config.user_hidden_2),\n nn.GELU(),\n nn.Dropout(config.dropout),\n nn.Linear(config.user_hidden_2, dim),\n )\n self.candidate_embedding = nn.Embedding(n_items, dim)\n self.register_buffer(\n \"item_features\", torch.from_numpy(item_features), persistent=True\n )\n self.item_tower = nn.Sequential(\n nn.Linear(dim + n_item_features, config.item_hidden_1),\n nn.GELU(),\n nn.Dropout(config.dropout),\n nn.Linear(config.item_hidden_1, config.item_hidden_2),\n nn.GELU(),\n nn.Dropout(config.dropout),\n nn.Linear(config.item_hidden_2, dim),\n )\n nn.init.normal_(self.context_embedding.weight, std=0.02)\n nn.init.normal_(self.candidate_embedding.weight, std=0.02)\n with torch.no_grad():\n self.context_embedding.weight[n_items].zero_()\n\n def _mean_context_channel(self, items: torch.Tensor) -> torch.Tensor:\n mask = items.ne(self.n_items)\n vectors = self.context_embedding(items)\n return (vectors * mask.unsqueeze(-1)).sum(dim=1) / mask.sum(\n dim=1, keepdim=True\n ).clamp_min(1)\n\n def encode_items(self, items: torch.Tensor) -> torch.Tensor:\n inputs = torch.cat(\n [self.candidate_embedding(items), self.item_features[items]], dim=1\n )\n return self.item_tower(inputs)\n\n\ndef invalid_negative_mask(\n dislike_count: int,\n) -> np.ndarray:\n start = int(\n np.searchsorted(\n timestamps,\n history_end - base.PROFILE_LOOKBACK_DAYS * base.DAY,\n side=\"left\",\n )\n )\n result = np.zeros(6, dtype=np.float32)\n recent_items = items[start:]\n if len(recent_items):\n result[0] = np.log1p(len(recent_items)) / 8.0\n result[1] = np.log1p(len(np.unique(recent_items))) / 6.0\n result[2] = float(np.mean(event_features[start:, 0]))\n result[3] = float(np.mean(event_features[start:, 1]))\n result[4] = np.log1p(like_count) / 6.0\n result[5] = np.log1p(dislike_count) / 4.0\n return result\n\n\ndef prepare_data(\n public: Path, stage: str, config: Config\n) -> tuple[SequenceData, CandidateSet]:\n data = public / \"data\"\n catalog = pd.read_parquet(data / \"candidate_catalog.parquet\").sort_values(\n \"popularity_rank\"\n )\n item_ids = catalog.item_id.to_numpy(dtype=np.int64, copy=True)\n item_index = pd.Index(item_ids)\n n_items = len(item_ids)\n if n_items >= np.iinfo(np.uint16).max:\n raise RuntimeError(\"uint16 item storage is too small for this catalog\")\n\n if stage == \"validation\":\n prefixes = (\"train\",)\n history_end = base.TRAIN_END\n candidate_name = \"validation_eligible_candidates.npz\"\n state_name = \"validation_preference_state.parquet\"\n else:\n prefixes = (\"train\", \"val\")\n history_end = base.VALIDATION_END\n candidate_name = \"test_eligible_candidates.npz\"\n state_name = \"test_preference_state.parquet\"\n eligibility = CandidateSet.read(data / candidate_name)\n if not np.array_equal(eligibility.item_ids, item_ids):\n raise RuntimeError(\"catalog and candidate artifact item order differ\")\n\n explicit_by_user = base.load_explicit_events(data, prefixes, item_index)\n inference_likes, inference_dislikes, like_counts, dislike_counts = (\n base.load_inference_state(\n data / state_name,\n item_index,\n eligibility.uids,\n n_items,\n )\n )\n inference_rows = {int(uid): row for row, uid in enumerate(eligibility.uids)}\n inference_user_features = np.zeros((len(eligibility.uids), 6), dtype=np.float32)\n inference_sequence_rows = np.full(len(eligibility.uids), -1, dtype=np.int32)\n\n # Snapshot zero is the shared empty explicit state.\n liked_states = [np.full(base.LIKE_ITEMS, n_items, dtype=np.uint16)]\n disliked_states = [\n np.full(base.DISLIKE_ITEMS, n_items, dtype=np.uint16)\n ]\n state_counts: list[tuple[int, int]] = [(0, 0)]\n user_ids: list[int] = []\n offsets = [0]\n timestamp_parts: list[np.ndarray] = []\n item_parts: list[np.ndarray] = []\n event_parts: list[np.ndarray] = []\n activity_parts: list[np.ndarray] = []\n state_parts: list[np.ndarray] = []\n\n listen_paths = [data / f\"{prefix}_listens.parquet\" for prefix in prefixes]\n started = time.monotonic()\n for seen_users, (uid, listens) in enumerate(\n base.merge_listen_streams(listen_paths, item_index), start=1\n ):\n parts = build_sequence_parts(\n listens,\n explicit_by_user.get(uid, base.empty_explicit_events()),\n n_items,\n liked_states,\n disliked_states,\n state_counts,\n )\n if parts is None:\n continue\n sequence_row = len(user_ids)\n user_ids.append(uid)\n timestamp_parts.append(parts[0].astype(np.uint32, copy=False))\n item_parts.append(parts[1])\n event_parts.append(parts[2])\n activity_parts.append(parts[3])\n state_parts.append(parts[4])\n offsets.append(offsets[-1] + len(parts[1]))\n inference_row = inference_rows.get(uid)\n if inference_row is not None:\n inference_sequence_rows[inference_row] = sequence_row\n inference_user_features[inference_row] = final_user_features(\n parts[0],\n parts[1],\n parts[2],\n history_end,\n int(like_counts[inference_row]),\n int(dislike_counts[inference_row]),\n )\n if seen_users % 1_000 == 0:\n log(\n f\"prepared users={seen_users:,} tokens={offsets[-1]:,} \"\n f\"states={len(liked_states):,} \"\n f\"elapsed={time.monotonic() - started:.1f}s\"\n )\n\n missing = np.flatnonzero(inference_sequence_rows < 0)\n if len(missing):\n inference_user_features[missing, 4] = np.log1p(like_counts[missing]) / 6.0\n inference_user_features[missing, 5] = (\n np.log1p(dislike_counts[missing]) / 4.0\n )\n log(f\"target users without qualifying catalog sequence={len(missing):,}\")\n\n prepared = SequenceData(\n item_ids=item_ids,\n item_features=base.build_item_features(catalog),\n user_ids=np.asarray(user_ids, dtype=np.int64),\n offsets=np.asarray(offsets, dtype=np.int64),\n sequence_timestamps=np.concatenate(timestamp_parts),\n sequence_items=np.concatenate(item_parts),\n event_features=np.concatenate(event_parts),\n activity_features=np.concatenate(activity_parts),\n state_ids=np.concatenate(state_parts),\n liked_states=np.stack(liked_states),\n disliked_states=np.stack(disliked_states),\n state_counts=np.asarray(state_counts, dtype=np.int32),\n inference_user_rows=inference_sequence_rows,\n inference_liked_items=inference_likes,\n inference_disliked_items=inference_dislikes,\n inference_user_features=inference_user_features,\n )\n log(\n f\"prepared stage={stage} sequence_users={len(prepared.user_ids):,} \"\n f\"tokens={len(prepared.sequence_items):,} \"\n f\"next_item_targets={prepared.target_count:,} \"\n f\"states={len(prepared.liked_states):,}\"\n )\n return prepared, eligibility\n\n\ndef cache_metadata(stage: str, config: Config) -> dict[str, object]:\n return {\n \"cache_version\": CACHE_VERSION,\n \"stage\": stage,\n \"positive_listen_threshold\": base.LISTEN_POSITIVE_THRESHOLD,\n \"profile_lookback_days\": base.PROFILE_LOOKBACK_DAYS,\n \"event_time_feature\": \"exp-negative-gap-over-60-days\",\n }\n\n\ndef save_cache(\n path: Path, prepared: SequenceData, stage: str, config: Config\n) -> None:\n path.parent.mkdir(parents=True, exist_ok=True)\n np.savez(\n path,\n metadata=np.asarray(json.dumps(cache_metadata(stage, config), sort_keys=True)),\n **prepared.__dict__,\n )\n log(f\"saved public-derived full-sequence cache: {path}\")\n\n\ndef load_cache(path: Path, stage: str, config: Config) -> SequenceData:\n with np.load(path, allow_pickle=False) as artifact:\n actual = json.loads(str(artifact[\"metadata\"].item()))\n expected = cache_metadata(stage, config)\n if actual != expected:\n raise RuntimeError(f\"sequence cache differs: {actual} != {expected}\")\n values = {\n field: artifact[field].copy()\n for field in SequenceData.__dataclass_fields__\n }\n prepared = SequenceData(**values)\n log(\n f\"loaded full-sequence cache: tokens={len(prepared.sequence_items):,} \"\n f\"targets={prepared.target_count:,}\"\n )\n return prepared\n\n\ndef load_or_prepare(\n public: Path,\n stage: str,\n config: Config,\n cache: Path | None,\n) -> tuple[SequenceData, CandidateSet]:\n candidate_name = (\n \"validation_eligible_candidates.npz\"\n if stage == \"validation\"\n else \"test_eligible_candidates.npz\"\n )\n eligibility = CandidateSet.read(public / \"data\" / candidate_name)\n if cache is not None and cache.is_file():\n prepared = load_cache(cache, stage, config)\n if not np.array_equal(prepared.item_ids, eligibility.item_ids):\n raise RuntimeError(\"cached catalog differs from candidate artifact\")\n return prepared, eligibility\n prepared, built_eligibility = prepare_data(public, stage, config)\n if cache is not None:\n save_cache(cache, prepared, stage, config)\n return prepared, built_eligibility\n\n\ndef build_item_correction(\n prepared: SequenceData,\n config: Config,\n target_starts: np.ndarray,\n target_counts: np.ndarray,\n) -> torch.Tensor:\n \"\"\"Estimate in-batch propensities from the selected training targets.\"\"\"\n raise RuntimeError(\"chronological target partition produced negative counts\")\n if not np.array_equal(\n window_starts + training_counts + validation_counts, total_targets\n ):\n raise RuntimeError(\"chronological target window is not a final contiguous suffix\")\n return window_starts\n\n\ndef chronological_target_partition(\n prepared: SequenceData,\n validation_fraction: float,\n max_train_targets_per_user: int,\n max_validation_targets_per_user: int,\n) -> TargetPartition:\n \"\"\"Select a recent contiguous window with a final out-of-time BCE suffix.\"\"\"\n totals = np.maximum(prepared.lengths - 1, 0).astype(np.int64)\n validation = np.floor(totals * validation_fraction).astype(np.int64)\n validation[(totals >= 2) & (validation == 0)] = 1\n if max_validation_targets_per_user:\n validation = np.minimum(validation, max_validation_targets_per_user)\n\n history_training = totals - validation\n training = history_training.copy()\n if max_train_targets_per_user:\n training = np.minimum(training, max_train_targets_per_user)\n window_starts = retained_target_window_starts(totals, validation, training)\n return TargetPartition(\n window_starts=window_starts,\n training_counts=training,\n validation_counts=validation,\n history_training_counts=history_training,\n )\n\n\ndef load_organic_like_outcomes(\n public: Path, stage: str, item_ids: np.ndarray\n) -> dict[int, dict[int, np.ndarray]]:\n \"\"\"Load mapped organic-like timestamps from public fitting history.\"\"\"\n prefixes = (\"train\",) if stage == \"validation\" else (\"train\", \"val\")\n frames = [\n pd.read_parquet(\n public / \"data\" / f\"{prefix}_likes.parquet\",\n columns=[\"uid\", \"timestamp\", \"item_id\", \"is_organic\"],\n )\n for prefix in prefixes\n ]\n likes = pd.concat(frames, ignore_index=True)\n likes = likes[likes.is_organic == 1].copy()\n mapped = pd.Index(item_ids).get_indexer(\n likes.item_id.to_numpy(dtype=np.int64)\n )\n likes = likes.loc[mapped >= 0, [\"uid\", \"timestamp\"]].copy()\n likes[\"item\"] = mapped[mapped >= 0].astype(np.int32, copy=False)\n likes = likes.sort_values([\"uid\", \"item\", \"timestamp\"], kind=\"stable\")\n nested: dict[int, dict[int, list[int]]] = {}\n for raw_uid, raw_timestamp, raw_item in likes.itertuples(\n index=False, name=None\n ):\n nested.setdefault(int(raw_uid), {}).setdefault(int(raw_item), []).append(\n int(raw_timestamp)\n )\n result = {\n uid: {\n item: np.asarray(timestamps, dtype=np.int64)\n for item, timestamps in items.items()\n }\n for uid, items in nested.items()\n }\n log(\n f\"loaded organic-like outcomes: rows={len(likes):,} \"\n f\"users={len(result):,}\"\n )\n return result\n\n\ndef build_target_weights(\n public: Path,\n stage: str,\n prepared: SequenceData,\n training_counts: np.ndarray,\n config: Config,\n) -> np.ndarray:\n \"\"\"Build nonzero per-token weights without dropping adjacent targets.\"\"\"\n if config.target_weighting == \"uniform\":\n weights = np.ones(len(prepared.sequence_items), dtype=np.float32)\n else:\n weights = np.full(\n len(prepared.sequence_items),\n config.ordinary_target_weight,\n dtype=np.float32,\n )\n organic_strong = (\n (prepared.event_features[:, 0] > 0.5)\n & (prepared.event_features[:, 1] >= 0.8)\n )\n weights[organic_strong] = config.organic_strong_target_weight\n if config.target_weighting == \"discovery-graded\":\n like_outcomes = load_organic_like_outcomes(\n public, stage, prepared.item_ids\n )\n history_end = (\n base.TRAIN_END if stage == \"validation\" else base.VALIDATION_END\n )\n horizon = config.discovery_horizon_days * base.DAY\n grade_three = 0\n for user_row, uid in enumerate(prepared.user_ids):\n start = int(prepared.offsets[user_row])\n end = int(prepared.offsets[user_row + 1])\n if end - start < 2:\n continue\n last_training_target = start + int(training_counts[user_row])\n first_validation_target = last_training_target + 1\n split_timestamp = (\n int(prepared.sequence_timestamps[first_validation_target])\n if first_validation_target < end\n else history_end\n )\n user_likes = like_outcomes.get(int(uid), {})\n seen = {int(prepared.sequence_items[start])}\n for position in range(start + 1, end):\n item = int(prepared.sequence_items[position])\n novel = item not in seen\n seen.add(item)\n if not novel:\n # Repeats remain training examples, but they cannot be\n # eligible discovery outcomes at the corresponding\n # cutoff and therefore keep only the ordinary weight.\n weights[position] = config.ordinary_target_weight\n continue\n timestamps = user_likes.get(item)\n if timestamps is None:\n continue\n timestamp = int(prepared.sequence_timestamps[position])\n upper = min(\n timestamp + horizon,\n split_timestamp\n if position <= last_training_target\n else history_end,\n )\n outcome = int(np.searchsorted(timestamps, timestamp, side=\"left\"))\n if outcome < len(timestamps) and int(timestamps[outcome]) < upper:\n weights[position] = config.organic_like_target_weight\n grade_three += 1\n log(\n f\"grade-3 first-encounter targets={grade_three:,} \"\n f\"horizon_days={config.discovery_horizon_days}\"\n )\n log(\n f\"target weighting={config.target_weighting} \"\n f\"min={weights.min():.3f} mean={weights.mean():.3f} \"\n f\"max={weights.max():.3f}\"\n )\n return weights\n\n\ndef build_dense_block(\n prepared: SequenceData,\n target_weights: np.ndarray,\n users: np.ndarray,\n window_starts: np.ndarray,\n process_counts: np.ndarray,\n score_starts: np.ndarray,\n start: int,\n steps: int,\n config: Config,\n) -> tuple[np.ndarray, ...]:\n \"\"\"Build one causal sequence block and mark the target rows to score.\"\"\"\n batch_size = len(users)\n padding_item = len(prepared.item_ids)\n input_items = np.full((batch_size, steps), padding_item, dtype=np.uint16)\n event_features = np.zeros((batch_size, steps, 3), dtype=np.float16)\n activity_features = np.zeros((batch_size, steps, 4), dtype=np.float16)\n state_ids = np.zeros((batch_size, steps), dtype=np.uint32)\n targets = np.zeros((batch_size, steps), dtype=np.uint16)\n weights = np.ones((batch_size, steps), dtype=np.float32)\n scored = np.zeros((batch_size, steps), dtype=bool)\n histories = np.full(\n (batch_size, steps, config.bptt_steps),\n padding_item,\n dtype=np.uint16,\n )\n processed = np.zeros(batch_size, dtype=np.int32)\n\n lengths = prepared.lengths\n for row, user_row in enumerate(users):\n count = min(steps, max(int(process_counts[row]) - start, 0))\n if not count:\n continue\n offset = int(prepared.offsets[user_row])\n window_start = int(window_starts[row])\n absolute_start = window_start + start\n positions = slice(\n offset + absolute_start,\n offset + absolute_start + count,\n )\n target_positions = slice(\n offset + absolute_start + 1,\n offset + absolute_start + count + 1,\n )\n input_items[row, :count] = prepared.sequence_items[positions]\n event_features[row, :count] = prepared.event_features[positions]\n activity_features[row, :count] = prepared.activity_features[positions]\n state_ids[row, :count] = prepared.state_ids[positions]\n targets[row, :count] = prepared.sequence_items[target_positions]\n weights[row, :count] = target_weights[target_positions]\n score_from = min(count, max(int(score_starts[row]) - start, 0))\n" } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab4493df70887d28a03bc36f8c8f642", "usage": { "input_tokens": 40534, "cached_input_tokens": 39040, "cache_write_input_tokens": 0, "output_tokens": 565, "reasoning_output_tokens": 336, "total_tokens": 41099 }, "turn_token_usage": { "input_tokens": 777365, "cached_input_tokens": 734592, "cache_write_input_tokens": 0, "output_tokens": 3957, "reasoning_output_tokens": 1019, "total_tokens": 781322 }, "thread_token_usage": { "input_tokens": 777365, "cached_input_tokens": 734592, "cache_write_input_tokens": 0, "output_tokens": 3957, "reasoning_output_tokens": 1019, "total_tokens": 781322 } } ## Step 27 · agent · 2026-09-23T21:49:14.264Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:49:23.506Z { "code": "const patch = \"*** Begin Patch\\n*** Update File: /app/solution/train_current_model.py\\n@@\\n parser.add_argument(\\\"--learning-rate\\\", type=float, default=Config.learning_rate)\\n+ parser.add_argument(\\n+ \\\"--uniform-negatives\\\", type=int, default=Config.uniform_negatives\\n+ )\\n+ parser.add_argument(\\n+ \\\"--inbatch-negatives\\\", type=int, default=Config.inbatch_negatives\\n+ )\\n+ parser.add_argument(\\n+ \\\"--inbatch-correction-power\\\",\\n+ type=float,\\n+ default=Config.inbatch_correction_power,\\n+ )\\n@@\\n args.epochs < 1\\n@@\\n or args.max_validation_targets_per_user < 0\\n+ or args.uniform_negatives < 0\\n+ or args.inbatch_negatives < 0\\n+ or args.uniform_negatives + args.inbatch_negatives < 1\\n+ or args.inbatch_correction_power < 0\\n@@\\n learning_rate=args.learning_rate,\\n+ uniform_negatives=args.uniform_negatives,\\n+ inbatch_negatives=args.inbatch_negatives,\\n+ inbatch_correction_power=args.inbatch_correction_power,\\n*** End Patch\";\ntext(await tools.apply_patch(patch));\n" } ### Tool output · 2026-09-23T21:49:23.602Z Script failed Wall time 0.0 seconds Output: Script error: Exit code: 1 Wall time: 0 seconds Output: Failed to write file /app/solution/train_current_model.py ### Harness context { "type": "codex_item_completed", "item": { "type": "FileChange", "id": "exec-062a6ca3-5661-4cac-9f83-f4fc7f7f9539", "changes": { "/app/solution/train_current_model.py": { "type": "update", "unified_diff": "@@ -1938,2 +1938,13 @@\n parser.add_argument(\n+ \"--uniform-negatives\", type=int, default=Config.uniform_negatives\n+ )\n+ parser.add_argument(\n+ \"--inbatch-negatives\", type=int, default=Config.inbatch_negatives\n+ )\n+ parser.add_argument(\n+ \"--inbatch-correction-power\",\n+ type=float,\n+ default=Config.inbatch_correction_power,\n+ )\n+ parser.add_argument(\n \"--loss-microbatch-size\",\n@@ -2020,2 +2031,6 @@\n or args.max_validation_targets_per_user < 0\n+ or args.uniform_negatives < 0\n+ or args.inbatch_negatives < 0\n+ or args.uniform_negatives + args.inbatch_negatives < 1\n+ or args.inbatch_correction_power < 0\n ):\n@@ -2032,2 +2047,5 @@\n learning_rate=args.learning_rate,\n+ uniform_negatives=args.uniform_negatives,\n+ inbatch_negatives=args.inbatch_negatives,\n+ inbatch_correction_power=args.inbatch_correction_power,\n loss_microbatch_size=args.loss_microbatch_size,\n", "move_path": null } }, "status": "failed", "stdout": "", "stderr": "Failed to write file /app/solution/train_current_model.py\n" } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab449514d0c87d281d51b21859fc123", "usage": { "input_tokens": 48807, "cached_input_tokens": 40320, "cache_write_input_tokens": 0, "output_tokens": 545, "reasoning_output_tokens": 247, "total_tokens": 49352 }, "turn_token_usage": { "input_tokens": 826172, "cached_input_tokens": 774912, "cache_write_input_tokens": 0, "output_tokens": 4502, "reasoning_output_tokens": 1266, "total_tokens": 830674 }, "thread_token_usage": { "input_tokens": 826172, "cached_input_tokens": 774912, "cache_write_input_tokens": 0, "output_tokens": 4502, "reasoning_output_tokens": 1266, "total_tokens": 830674 } } ## Step 28 · agent · 2026-09-23T21:49:29.782Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:49:29.783Z { "code": "const r = await tools.exec_command({cmd:\"chmod u+w /app/solution/train_current_model.py /app/solution/two_tower_model.py\",\"workdir\":\"/app\",\"yield_time_ms\":10000,\"max_output_tokens\":1000}); text(r.output)\n" } ### Tool output · 2026-09-23T21:49:29.861Z Script completed Wall time 0.0 seconds Output: ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-4474b343-4bb2-4813-b80d-89fbda087443", "process_id": "24920", "command": [ "/bin/sh", "-lc", "chmod u+w /app/solution/train_current_model.py /app/solution/two_tower_model.py" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "chmod u+w /app/solution/train_current_model.py /app/solution/two_tower_model.py" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "", "stderr": "", "aggregated_output": "", "exit_code": 0, "duration": { "secs": 0, "nanos": 5320 }, "formatted_output": "" } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44963feb487d2a4ae1e5cf4d8bfec", "usage": { "input_tokens": 49406, "cached_input_tokens": 48640, "cache_write_input_tokens": 0, "output_tokens": 76, "reasoning_output_tokens": 8, "total_tokens": 49482 }, "turn_token_usage": { "input_tokens": 875578, "cached_input_tokens": 823552, "cache_write_input_tokens": 0, "output_tokens": 4578, "reasoning_output_tokens": 1274, "total_tokens": 880156 }, "thread_token_usage": { "input_tokens": 875578, "cached_input_tokens": 823552, "cache_write_input_tokens": 0, "output_tokens": 4578, "reasoning_output_tokens": 1274, "total_tokens": 880156 } } ### exec · 2026-09-23T21:49:41.038Z { "code": "const patch = \"*** Begin Patch\\n*** Update File: /app/solution/train_current_model.py\\n@@\\n parser.add_argument(\\\"--learning-rate\\\", type=float, default=Config.learning_rate)\\n+ parser.add_argument(\\n+ \\\"--uniform-negatives\\\", type=int, default=Config.uniform_negatives\\n+ )\\n+ parser.add_argument(\\n+ \\\"--inbatch-negatives\\\", type=int, default=Config.inbatch_negatives\\n+ )\\n+ parser.add_argument(\\n+ \\\"--inbatch-correction-power\\\",\\n+ type=float,\\n+ default=Config.inbatch_correction_power,\\n+ )\\n@@\\n or args.max_validation_targets_per_user < 0\\n+ or args.uniform_negatives < 0\\n+ or args.inbatch_negatives < 0\\n+ or args.uniform_negatives + args.inbatch_negatives < 1\\n+ or args.inbatch_correction_power < 0\\n@@\\n learning_rate=args.learning_rate,\\n+ uniform_negatives=args.uniform_negatives,\\n+ inbatch_negatives=args.inbatch_negatives,\\n+ inbatch_correction_power=args.inbatch_correction_power,\\n*** End Patch\";\ntext(await tools.apply_patch(patch));\n" } ### Tool output · 2026-09-23T21:49:41.130Z Script completed Wall time 0.0 seconds Output: {} ### Harness context { "type": "codex_item_completed", "item": { "type": "FileChange", "id": "exec-4292df62-16ad-4e85-8a1b-933e3b3dad0e", "changes": { "/app/solution/train_current_model.py": { "type": "update", "unified_diff": "@@ -1938,2 +1938,13 @@\n parser.add_argument(\n+ \"--uniform-negatives\", type=int, default=Config.uniform_negatives\n+ )\n+ parser.add_argument(\n+ \"--inbatch-negatives\", type=int, default=Config.inbatch_negatives\n+ )\n+ parser.add_argument(\n+ \"--inbatch-correction-power\",\n+ type=float,\n+ default=Config.inbatch_correction_power,\n+ )\n+ parser.add_argument(\n \"--loss-microbatch-size\",\n@@ -2020,2 +2031,6 @@\n or args.max_validation_targets_per_user < 0\n+ or args.uniform_negatives < 0\n+ or args.inbatch_negatives < 0\n+ or args.uniform_negatives + args.inbatch_negatives < 1\n+ or args.inbatch_correction_power < 0\n ):\n@@ -2032,2 +2047,5 @@\n learning_rate=args.learning_rate,\n+ uniform_negatives=args.uniform_negatives,\n+ inbatch_negatives=args.inbatch_negatives,\n+ inbatch_correction_power=args.inbatch_correction_power,\n loss_microbatch_size=args.loss_microbatch_size,\n", "move_path": null } }, "status": "completed", "stdout": "Success. Updated the following files:\nM /app/solution/train_current_model.py\n", "stderr": "" } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab4496a757887d2802b9e7809c0b67e", "usage": { "input_tokens": 49505, "cached_input_tokens": 20864, "cache_write_input_tokens": 0, "output_tokens": 285, "reasoning_output_tokens": 0, "total_tokens": 49790 }, "turn_token_usage": { "input_tokens": 925083, "cached_input_tokens": 844416, "cache_write_input_tokens": 0, "output_tokens": 4863, "reasoning_output_tokens": 1274, "total_tokens": 929946 }, "thread_token_usage": { "input_tokens": 925083, "cached_input_tokens": 844416, "cache_write_input_tokens": 0, "output_tokens": 4863, "reasoning_output_tokens": 1274, "total_tokens": 929946 } } ## Step 29 · agent · 2026-09-23T21:49:48.170Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:49:48.171Z { "code": "const r = await tools.exec_command({cmd:\"sed -n '1930,2050p' /app/solution/train_current_model.py; /opt/task-venv/bin/python -m py_compile /app/solution/train_current_model.py\",\"workdir\":\"/app\",\"yield_time_ms\":10000,\"max_output_tokens\":6000}); text(r.output)\n" } ### Tool output · 2026-09-23T21:49:48.349Z Script completed Wall time 0.2 seconds Output: parser.add_argument("--device", choices=("cpu", "mps"), default="cpu") parser.add_argument("--threads", type=int, default=8) parser.add_argument("--bptt-steps", type=int, default=Config.bptt_steps) parser.add_argument( "--user-batch-size", type=int, default=Config.user_batch_size ) parser.add_argument("--epochs", type=int, default=Config.epochs) parser.add_argument("--learning-rate", type=float, default=Config.learning_rate) parser.add_argument( "--uniform-negatives", type=int, default=Config.uniform_negatives ) parser.add_argument( "--inbatch-negatives", type=int, default=Config.inbatch_negatives ) parser.add_argument( "--inbatch-correction-power", type=float, default=Config.inbatch_correction_power, ) parser.add_argument( "--loss-microbatch-size", type=int, default=Config.loss_microbatch_size, ) parser.add_argument( "--negative-filter-scope", choices=("full-training-history", "last-100"), default=Config.negative_filter_scope, ) parser.add_argument( "--target-weighting", choices=("discovery-graded", "organic-strong", "uniform"), default=Config.target_weighting, ) parser.add_argument( "--ordinary-target-weight", type=float, default=Config.ordinary_target_weight, ) parser.add_argument( "--organic-strong-target-weight", type=float, default=Config.organic_strong_target_weight, ) parser.add_argument( "--organic-like-target-weight", type=float, default=Config.organic_like_target_weight, ) parser.add_argument( "--discovery-horizon-days", type=int, default=Config.discovery_horizon_days, ) parser.add_argument( "--validation-fraction", type=float, default=Config.validation_fraction, ) parser.add_argument( "--max-train-targets-per-user", type=int, default=Config.max_train_targets_per_user, help="retain this many recent pre-validation targets per user; 0 is uncapped", ) parser.add_argument( "--max-validation-targets-per-user", type=int, default=Config.max_validation_targets_per_user, help="retain this many final validation targets per user; 0 is uncapped", ) parser.add_argument( "--early-stopping-patience", type=int, default=Config.early_stopping_patience, ) parser.add_argument( "--early-stopping-min-delta", type=float, default=Config.early_stopping_min_delta, ) parser.add_argument("--checkpoint-dir", type=Path) parser.add_argument("--resume-checkpoint", type=Path) parser.add_argument("--seed", type=int, default=Config.seed) parser.add_argument("--ranking-batch-size", type=int, default=64) parser.add_argument("--prepare-only", action="store_true") args = parser.parse_args() if args.threads < 1 or args.bptt_steps < 2 or args.user_batch_size < 1: parser.error("threads, BPTT steps, and user batch size must be positive") if ( args.epochs < 1 or args.learning_rate <= 0 or args.loss_microbatch_size < 1 or args.early_stopping_patience < 1 or args.early_stopping_min_delta < 0 or args.ordinary_target_weight <= 0 or args.organic_strong_target_weight <= 0 or args.organic_like_target_weight <= 0 or args.discovery_horizon_days < 1 or args.max_train_targets_per_user < 0 or args.max_validation_targets_per_user < 0 or args.uniform_negatives < 0 or args.inbatch_negatives < 0 or args.uniform_negatives + args.inbatch_negatives < 1 or args.inbatch_correction_power < 0 ): parser.error("training counts, learning rate, and patience are invalid") if not 0.0 < args.validation_fraction < 1.0: parser.error("validation fraction must be strictly between zero and one") public = args.public_dir.resolve() if not (public / "data" / "candidate_catalog.parquet").is_file(): parser.error(f"public task data not found under {public}") config = Config( bptt_steps=args.bptt_steps, user_batch_size=args.user_batch_size, epochs=args.epochs, learning_rate=args.learning_rate, uniform_negatives=args.uniform_negatives, inbatch_negatives=args.inbatch_negatives, inbatch_correction_power=args.inbatch_correction_power, ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44975758087d2ac1a1c99bd8ddeea", "usage": { "input_tokens": 49814, "cached_input_tokens": 49280, "cache_write_input_tokens": 0, "output_tokens": 96, "reasoning_output_tokens": 9, "total_tokens": 49910 }, "turn_token_usage": { "input_tokens": 974897, "cached_input_tokens": 893696, "cache_write_input_tokens": 0, "output_tokens": 4959, "reasoning_output_tokens": 1283, "total_tokens": 979856 }, "thread_token_usage": { "input_tokens": 974897, "cached_input_tokens": 893696, "cache_write_input_tokens": 0, "output_tokens": 4959, "reasoning_output_tokens": 1283, "total_tokens": 979856 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-f9632cb3-f513-4e0e-bbb7-afe814ab6e78", "process_id": "91794", "command": [ "/bin/sh", "-lc", "sed -n '1930,2050p' /app/solution/train_current_model.py; /opt/task-venv/bin/python -m py_compile /app/solution/train_current_model.py" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "sed -n '1930,2050p' /app/solution/train_current_model.py; /opt/task-venv/bin/python -m py_compile /app/solution/train_current_model.py" } ], "source": "unified_exec_startup", "status": "completed", "stdout": " parser.add_argument(\"--device\", choices=(\"cpu\", \"mps\"), default=\"cpu\")\n parser.add_argument(\"--threads\", type=int, default=8)\n parser.add_argument(\"--bptt-steps\", type=int, default=Config.bptt_steps)\n parser.add_argument(\n \"--user-batch-size\", type=int, default=Config.user_batch_size\n )\n parser.add_argument(\"--epochs\", type=int, default=Config.epochs)\n parser.add_argument(\"--learning-rate\", type=float, default=Config.learning_rate)\n parser.add_argument(\n \"--uniform-negatives\", type=int, default=Config.uniform_negatives\n )\n parser.add_argument(\n \"--inbatch-negatives\", type=int, default=Config.inbatch_negatives\n )\n parser.add_argument(\n \"--inbatch-correction-power\",\n type=float,\n default=Config.inbatch_correction_power,\n )\n parser.add_argument(\n \"--loss-microbatch-size\",\n type=int,\n default=Config.loss_microbatch_size,\n )\n parser.add_argument(\n \"--negative-filter-scope\",\n choices=(\"full-training-history\", \"last-100\"),\n default=Config.negative_filter_scope,\n )\n parser.add_argument(\n \"--target-weighting\",\n choices=(\"discovery-graded\", \"organic-strong\", \"uniform\"),\n default=Config.target_weighting,\n )\n parser.add_argument(\n \"--ordinary-target-weight\",\n type=float,\n default=Config.ordinary_target_weight,\n )\n parser.add_argument(\n \"--organic-strong-target-weight\",\n type=float,\n default=Config.organic_strong_target_weight,\n )\n parser.add_argument(\n \"--organic-like-target-weight\",\n type=float,\n default=Config.organic_like_target_weight,\n )\n parser.add_argument(\n \"--discovery-horizon-days\",\n type=int,\n default=Config.discovery_horizon_days,\n )\n parser.add_argument(\n \"--validation-fraction\",\n type=float,\n default=Config.validation_fraction,\n )\n parser.add_argument(\n \"--max-train-targets-per-user\",\n type=int,\n default=Config.max_train_targets_per_user,\n help=\"retain this many recent pre-validation targets per user; 0 is uncapped\",\n )\n parser.add_argument(\n \"--max-validation-targets-per-user\",\n type=int,\n default=Config.max_validation_targets_per_user,\n help=\"retain this many final validation targets per user; 0 is uncapped\",\n )\n parser.add_argument(\n \"--early-stopping-patience\",\n type=int,\n default=Config.early_stopping_patience,\n )\n parser.add_argument(\n \"--early-stopping-min-delta\",\n type=float,\n default=Config.early_stopping_min_delta,\n )\n parser.add_argument(\"--checkpoint-dir\", type=Path)\n parser.add_argument(\"--resume-checkpoint\", type=Path)\n parser.add_argument(\"--seed\", type=int, default=Config.seed)\n parser.add_argument(\"--ranking-batch-size\", type=int, default=64)\n parser.add_argument(\"--prepare-only\", action=\"store_true\")\n args = parser.parse_args()\n\n if args.threads < 1 or args.bptt_steps < 2 or args.user_batch_size < 1:\n parser.error(\"threads, BPTT steps, and user batch size must be positive\")\n if (\n args.epochs < 1\n or args.learning_rate <= 0\n or args.loss_microbatch_size < 1\n or args.early_stopping_patience < 1\n or args.early_stopping_min_delta < 0\n or args.ordinary_target_weight <= 0\n or args.organic_strong_target_weight <= 0\n or args.organic_like_target_weight <= 0\n or args.discovery_horizon_days < 1\n or args.max_train_targets_per_user < 0\n or args.max_validation_targets_per_user < 0\n or args.uniform_negatives < 0\n or args.inbatch_negatives < 0\n or args.uniform_negatives + args.inbatch_negatives < 1\n or args.inbatch_correction_power < 0\n ):\n parser.error(\"training counts, learning rate, and patience are invalid\")\n if not 0.0 < args.validation_fraction < 1.0:\n parser.error(\"validation fraction must be strictly between zero and one\")\n public = args.public_dir.resolve()\n if not (public / \"data\" / \"candidate_catalog.parquet\").is_file():\n parser.error(f\"public task data not found under {public}\")\n config = Config(\n bptt_steps=args.bptt_steps,\n user_batch_size=args.user_batch_size,\n epochs=args.epochs,\n learning_rate=args.learning_rate,\n uniform_negatives=args.uniform_negatives,\n inbatch_negatives=args.inbatch_negatives,\n inbatch_correction_power=args.inbatch_correction_power,\n", "stderr": "", "aggregated_output": " parser.add_argument(\"--device\", choices=(\"cpu\", \"mps\"), default=\"cpu\")\n parser.add_argument(\"--threads\", type=int, default=8)\n parser.add_argument(\"--bptt-steps\", type=int, default=Config.bptt_steps)\n parser.add_argument(\n \"--user-batch-size\", type=int, default=Config.user_batch_size\n )\n parser.add_argument(\"--epochs\", type=int, default=Config.epochs)\n parser.add_argument(\"--learning-rate\", type=float, default=Config.learning_rate)\n parser.add_argument(\n \"--uniform-negatives\", type=int, default=Config.uniform_negatives\n )\n parser.add_argument(\n \"--inbatch-negatives\", type=int, default=Config.inbatch_negatives\n )\n parser.add_argument(\n \"--inbatch-correction-power\",\n type=float,\n default=Config.inbatch_correction_power,\n )\n parser.add_argument(\n \"--loss-microbatch-size\",\n type=int,\n default=Config.loss_microbatch_size,\n )\n parser.add_argument(\n \"--negative-filter-scope\",\n choices=(\"full-training-history\", \"last-100\"),\n default=Config.negative_filter_scope,\n )\n parser.add_argument(\n \"--target-weighting\",\n choices=(\"discovery-graded\", \"organic-strong\", \"uniform\"),\n default=Config.target_weighting,\n )\n parser.add_argument(\n \"--ordinary-target-weight\",\n type=float,\n default=Config.ordinary_target_weight,\n )\n parser.add_argument(\n \"--organic-strong-target-weight\",\n type=float,\n default=Config.organic_strong_target_weight,\n )\n parser.add_argument(\n \"--organic-like-target-weight\",\n type=float,\n default=Config.organic_like_target_weight,\n )\n parser.add_argument(\n \"--discovery-horizon-days\",\n type=int,\n default=Config.discovery_horizon_days,\n )\n parser.add_argument(\n \"--validation-fraction\",\n type=float,\n default=Config.validation_fraction,\n )\n parser.add_argument(\n \"--max-train-targets-per-user\",\n type=int,\n default=Config.max_train_targets_per_user,\n help=\"retain this many recent pre-validation targets per user; 0 is uncapped\",\n )\n parser.add_argument(\n \"--max-validation-targets-per-user\",\n type=int,\n default=Config.max_validation_targets_per_user,\n help=\"retain this many final validation targets per user; 0 is uncapped\",\n )\n parser.add_argument(\n \"--early-stopping-patience\",\n type=int,\n default=Config.early_stopping_patience,\n )\n parser.add_argument(\n \"--early-stopping-min-delta\",\n type=float,\n default=Config.early_stopping_min_delta,\n )\n parser.add_argument(\"--checkpoint-dir\", type=Path)\n parser.add_argument(\"--resume-checkpoint\", type=Path)\n parser.add_argument(\"--seed\", type=int, default=Config.seed)\n parser.add_argument(\"--ranking-batch-size\", type=int, default=64)\n parser.add_argument(\"--prepare-only\", action=\"store_true\")\n args = parser.parse_args()\n\n if args.threads < 1 or args.bptt_steps < 2 or args.user_batch_size < 1:\n parser.error(\"threads, BPTT steps, and user batch size must be positive\")\n if (\n args.epochs < 1\n or args.learning_rate <= 0\n or args.loss_microbatch_size < 1\n or args.early_stopping_patience < 1\n or args.early_stopping_min_delta < 0\n or args.ordinary_target_weight <= 0\n or args.organic_strong_target_weight <= 0\n or args.organic_like_target_weight <= 0\n or args.discovery_horizon_days < 1\n or args.max_train_targets_per_user < 0\n or args.max_validation_targets_per_user < 0\n or args.uniform_negatives < 0\n or args.inbatch_negatives < 0\n or args.uniform_negatives + args.inbatch_negatives < 1\n or args.inbatch_correction_power < 0\n ):\n parser.error(\"training counts, learning rate, and patience are invalid\")\n if not 0.0 < args.validation_fraction < 1.0:\n parser.error(\"validation fraction must be strictly between zero and one\")\n public = args.public_dir.resolve()\n if not (public / \"data\" / \"candidate_catalog.parquet\").is_file():\n parser.error(f\"public task data not found under {public}\")\n config = Config(\n bptt_steps=args.bptt_steps,\n user_batch_size=args.user_batch_size,\n epochs=args.epochs,\n learning_rate=args.learning_rate,\n uniform_negatives=args.uniform_negatives,\n inbatch_negatives=args.inbatch_negatives,\n inbatch_correction_power=args.inbatch_correction_power,\n", "exit_code": 0, "duration": { "secs": 0, "nanos": 5100 }, "formatted_output": " parser.add_argument(\"--device\", choices=(\"cpu\", \"mps\"), default=\"cpu\")\n parser.add_argument(\"--threads\", type=int, default=8)\n parser.add_argument(\"--bptt-steps\", type=int, default=Config.bptt_steps)\n parser.add_argument(\n \"--user-batch-size\", type=int, default=Config.user_batch_size\n )\n parser.add_argument(\"--epochs\", type=int, default=Config.epochs)\n parser.add_argument(\"--learning-rate\", type=float, default=Config.learning_rate)\n parser.add_argument(\n \"--uniform-negatives\", type=int, default=Config.uniform_negatives\n )\n parser.add_argument(\n \"--inbatch-negatives\", type=int, default=Config.inbatch_negatives\n )\n parser.add_argument(\n \"--inbatch-correction-power\",\n type=float,\n default=Config.inbatch_correction_power,\n )\n parser.add_argument(\n \"--loss-microbatch-size\",\n type=int,\n default=Config.loss_microbatch_size,\n )\n parser.add_argument(\n \"--negative-filter-scope\",\n choices=(\"full-training-history\", \"last-100\"),\n default=Config.negative_filter_scope,\n )\n parser.add_argument(\n \"--target-weighting\",\n choices=(\"discovery-graded\", \"organic-strong\", \"uniform\"),\n default=Config.target_weighting,\n )\n parser.add_argument(\n \"--ordinary-target-weight\",\n type=float,\n default=Config.ordinary_target_weight,\n )\n parser.add_argument(\n \"--organic-strong-target-weight\",\n type=float,\n default=Config.organic_strong_target_weight,\n )\n parser.add_argument(\n \"--organic-like-target-weight\",\n type=float,\n default=Config.organic_like_target_weight,\n )\n parser.add_argument(\n \"--discovery-horizon-days\",\n type=int,\n default=Config.discovery_horizon_days,\n )\n parser.add_argument(\n \"--validation-fraction\",\n type=float,\n default=Config.validation_fraction,\n )\n parser.add_argument(\n \"--max-train-targets-per-user\",\n type=int,\n default=Config.max_train_targets_per_user,\n help=\"retain this many recent pre-validation targets per user; 0 is uncapped\",\n )\n parser.add_argument(\n \"--max-validation-targets-per-user\",\n type=int,\n default=Config.max_validation_targets_per_user,\n help=\"retain this many final validation targets per user; 0 is uncapped\",\n )\n parser.add_argument(\n \"--early-stopping-patience\",\n type=int,\n default=Config.early_stopping_patience,\n )\n parser.add_argument(\n \"--early-stopping-min-delta\",\n type=float,\n default=Config.early_stopping_min_delta,\n )\n parser.add_argument(\"--checkpoint-dir\", type=Path)\n parser.add_argument(\"--resume-checkpoint\", type=Path)\n parser.add_argument(\"--seed\", type=int, default=Config.seed)\n parser.add_argument(\"--ranking-batch-size\", type=int, default=64)\n parser.add_argument(\"--prepare-only\", action=\"store_true\")\n args = parser.parse_args()\n\n if args.threads < 1 or args.bptt_steps < 2 or args.user_batch_size < 1:\n parser.error(\"threads, BPTT steps, and user batch size must be positive\")\n if (\n args.epochs < 1\n or args.learning_rate <= 0\n or args.loss_microbatch_size < 1\n or args.early_stopping_patience < 1\n or args.early_stopping_min_delta < 0\n or args.ordinary_target_weight <= 0\n or args.organic_strong_target_weight <= 0\n or args.organic_like_target_weight <= 0\n or args.discovery_horizon_days < 1\n or args.max_train_targets_per_user < 0\n or args.max_validation_targets_per_user < 0\n or args.uniform_negatives < 0\n or args.inbatch_negatives < 0\n or args.uniform_negatives + args.inbatch_negatives < 1\n or args.inbatch_correction_power < 0\n ):\n parser.error(\"training counts, learning rate, and patience are invalid\")\n if not 0.0 < args.validation_fraction < 1.0:\n parser.error(\"validation fraction must be strictly between zero and one\")\n public = args.public_dir.resolve()\n if not (public / \"data\" / \"candidate_catalog.parquet\").is_file():\n parser.error(f\"public task data not found under {public}\")\n config = Config(\n bptt_steps=args.bptt_steps,\n user_batch_size=args.user_batch_size,\n epochs=args.epochs,\n learning_rate=args.learning_rate,\n uniform_negatives=args.uniform_negatives,\n inbatch_negatives=args.inbatch_negatives,\n inbatch_correction_power=args.inbatch_correction_power,\n" } } ## Step 30 · agent · 2026-09-23T21:49:50.170Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:49:54.013Z { "code": "const r = await tools.exec_command({cmd:\"/opt/task-venv/bin/python /app/solution/train_current_model.py --stage validation --public-dir /task --prepared-cache /app/solution/validation_cache.npz --output /app/solution/inbatch_validation.parquet --uniform-negatives 0 --inbatch-negatives 32 --inbatch-correction-power 0 --checkpoint-dir /app/solution/inbatch_ckpt\",\"workdir\":\"/app/solution\",\"yield_time_ms\":1000,\"max_output_tokens\":12000}); text(JSON.stringify(r))\n" } ### Tool output · 2026-09-23T21:49:55.184Z Script completed Wall time 1.2 seconds Output: {"chunk_id":"223d2f","wall_time_seconds":1.001740312,"session_id":13988,"original_token_count":0,"output":""} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab4497c910c87d283f385b821b76755", "usage": { "input_tokens": 50977, "cached_input_tokens": 49664, "cache_write_input_tokens": 0, "output_tokens": 152, "reasoning_output_tokens": 23, "total_tokens": 51129 }, "turn_token_usage": { "input_tokens": 1025874, "cached_input_tokens": 943360, "cache_write_input_tokens": 0, "output_tokens": 5111, "reasoning_output_tokens": 1306, "total_tokens": 1030985 }, "thread_token_usage": { "input_tokens": 1025874, "cached_input_tokens": 943360, "cache_write_input_tokens": 0, "output_tokens": 5111, "reasoning_output_tokens": 1306, "total_tokens": 1030985 } } ## Step 31 · agent · 2026-09-23T21:49:56.435Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:49:57.820Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:13988,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:50:27.834Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"29a1cd","wall_time_seconds":30.000893886,"session_id":13988,"original_token_count":103} loaded full-sequence cache: tokens=20,056,329 targets=20,047,194 chronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194 inbatch correction: min=1.000 mean_on_targets=1.000 max=1.000 target weighting=organic-strong min=0.250 mean=0.575 max=1.000 full-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250 ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab449835af887d283c72e8da9120f57", "usage": { "input_tokens": 51187, "cached_input_tokens": 49280, "cache_write_input_tokens": 0, "output_tokens": 59, "reasoning_output_tokens": 6, "total_tokens": 51246 }, "turn_token_usage": { "input_tokens": 1077061, "cached_input_tokens": 992640, "cache_write_input_tokens": 0, "output_tokens": 5170, "reasoning_output_tokens": 1312, "total_tokens": 1082231 }, "thread_token_usage": { "input_tokens": 1077061, "cached_input_tokens": 992640, "cache_write_input_tokens": 0, "output_tokens": 5170, "reasoning_output_tokens": 1312, "total_tokens": 1082231 } } ## Step 32 · agent · 2026-09-23T21:50:30.025Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:50:31.393Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:13988,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:51:01.404Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"696d52","wall_time_seconds":30.000783643,"session_id":13988,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab449a41bc887d29fe5ebbb3f11366d", "usage": { "input_tokens": 51434, "cached_input_tokens": 50816, "cache_write_input_tokens": 0, "output_tokens": 82, "reasoning_output_tokens": 29, "total_tokens": 51516 }, "turn_token_usage": { "input_tokens": 1128495, "cached_input_tokens": 1043456, "cache_write_input_tokens": 0, "output_tokens": 5252, "reasoning_output_tokens": 1341, "total_tokens": 1133747 }, "thread_token_usage": { "input_tokens": 1128495, "cached_input_tokens": 1043456, "cache_write_input_tokens": 0, "output_tokens": 5252, "reasoning_output_tokens": 1341, "total_tokens": 1133747 } } ### exec · 2026-09-23T21:51:03.974Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:13988,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:51:34.021Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"08b59e","wall_time_seconds":30.001497289,"session_id":13988,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab449c5c2b887d2801a4e2fc923e858", "usage": { "input_tokens": 51569, "cached_input_tokens": 51072, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 51620 }, "turn_token_usage": { "input_tokens": 1180064, "cached_input_tokens": 1094528, "cache_write_input_tokens": 0, "output_tokens": 5303, "reasoning_output_tokens": 1341, "total_tokens": 1185367 }, "thread_token_usage": { "input_tokens": 1180064, "cached_input_tokens": 1094528, "cache_write_input_tokens": 0, "output_tokens": 5303, "reasoning_output_tokens": 1341, "total_tokens": 1185367 } } ## Step 33 · agent · 2026-09-23T21:51:35.489Z ### Thinking unavailable — no text recorded The first controlled run uses 32 uncorrected in-batch negatives and no catalog-uniform negatives, holding architecture, target weights, split, seed, and total negative count fixed. This directly tests whether realistic competing tracks improve top-10 retrieval; the full-history false-negative filter remains active. ### exec · 2026-09-23T21:51:39.125Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:13988,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:52:09.141Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"f2f774","wall_time_seconds":30.001507588,"session_id":13988,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab449e638a087d298b11c4a14d1328a", "usage": { "input_tokens": 51674, "cached_input_tokens": 51328, "cache_write_input_tokens": 0, "output_tokens": 134, "reasoning_output_tokens": 15, "total_tokens": 51808 }, "turn_token_usage": { "input_tokens": 1231738, "cached_input_tokens": 1145856, "cache_write_input_tokens": 0, "output_tokens": 5437, "reasoning_output_tokens": 1356, "total_tokens": 1237175 }, "thread_token_usage": { "input_tokens": 1231738, "cached_input_tokens": 1145856, "cache_write_input_tokens": 0, "output_tokens": 5437, "reasoning_output_tokens": 1356, "total_tokens": 1237175 } } ### exec · 2026-09-23T21:52:12.015Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:13988,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:52:42.026Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"3e4d69","wall_time_seconds":30.000704234,"session_id":13988,"original_token_count":97} epoch=1/1 batches=250 targets=987,417 batch_bce=0.603578 running_bce=0.620119 elapsed=130.2s saved epoch checkpoint: /app/solution/inbatch_ckpt/epoch-01.pt epoch=1/1 train_loss=0.61811 validation_loss=0.58726 pair_accuracy=0.674 train_targets=1,052,953 validation_targets=130,103 train_seconds=139.0 validation_seconds=11.2 restored best validation-BCE checkpoint: epoch=1 loss=0.587262 ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44a097adc87d2b1b6d88c00de28f1", "usage": { "input_tokens": 51862, "cached_input_tokens": 51200, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 51913 }, "turn_token_usage": { "input_tokens": 1283600, "cached_input_tokens": 1197056, "cache_write_input_tokens": 0, "output_tokens": 5488, "reasoning_output_tokens": 1356, "total_tokens": 1289088 }, "thread_token_usage": { "input_tokens": 1283600, "cached_input_tokens": 1197056, "cache_write_input_tokens": 0, "output_tokens": 5488, "reasoning_output_tokens": 1356, "total_tokens": 1289088 } } ## Step 34 · agent · 2026-09-23T21:52:43.775Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:52:45.161Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:13988,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:53:15.191Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"4f1587","wall_time_seconds":30.001205381,"session_id":13988,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44a2a438087d29568ef0e248384ea", "usage": { "input_tokens": 52092, "cached_input_tokens": 51712, "cache_write_input_tokens": 0, "output_tokens": 67, "reasoning_output_tokens": 14, "total_tokens": 52159 }, "turn_token_usage": { "input_tokens": 1335692, "cached_input_tokens": 1248768, "cache_write_input_tokens": 0, "output_tokens": 5555, "reasoning_output_tokens": 1370, "total_tokens": 1341247 }, "thread_token_usage": { "input_tokens": 1335692, "cached_input_tokens": 1248768, "cache_write_input_tokens": 0, "output_tokens": 5555, "reasoning_output_tokens": 1370, "total_tokens": 1341247 } } ### exec · 2026-09-23T21:53:17.623Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:13988,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:53:47.650Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"6567e8","wall_time_seconds":30.00105317,"session_id":13988,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44a4b758c87d2846e069225f55791", "usage": { "input_tokens": 52213, "cached_input_tokens": 51456, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 52264 }, "turn_token_usage": { "input_tokens": 1387905, "cached_input_tokens": 1300224, "cache_write_input_tokens": 0, "output_tokens": 5606, "reasoning_output_tokens": 1370, "total_tokens": 1393511 }, "thread_token_usage": { "input_tokens": 1387905, "cached_input_tokens": 1300224, "cache_write_input_tokens": 0, "output_tokens": 5606, "reasoning_output_tokens": 1370, "total_tokens": 1393511 } } ### exec · 2026-09-23T21:53:50.185Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:13988,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:53:58.193Z Script completed Wall time 8.0 seconds Output: {"chunk_id":"be78f1","wall_time_seconds":7.9787631789999995,"exit_code":0,"original_token_count":802} ranked users=1,024/8,456 ranked users=2,048/8,456 ranked users=3,072/8,456 ranked users=4,096/8,456 ranked users=5,120/8,456 ranked users=6,144/8,456 ranked users=7,168/8,456 ranked users=8,192/8,456 ranked users=8,456/8,456 { "baseline": "yambda-windowed-sequence-two-tower-base", "stage": "validation", "output": "/app/solution/inbatch_validation.parquet", "rows": 845600, "users": 8456, "runtime_seconds": 239.405, "public_inputs_only": true, "architecture": { "family": "pure-windowed-sequence-two-tower", "sequence_training": "every-adjacent-target-within-recent-chronological-window", "sequence_encoder": "one-layer-GRU-dense-timestep-loss", "bptt_hidden_state": "carried-and-detached", "model_selection": "chronological-validation-BCE-early-stopping", "loss_execution": "gradient-accumulated-microbatches", "user_id_embedding": false, "user_mlp": "582-512-256-192", "item_mlp": "196-512-256-192", "normalization": "none", "score": "raw-dot-product", "objective": "sample-weighted-BCE-at-every-timestep", "negative_sampling": "24-uniform-plus-8-propensity-corrected-inbatch", "false_negative_filter": "full-training-history", "target_weighting": "organic-strong" }, "config": { "bptt_steps": 100, "user_batch_size": 64, "embedding_dim": 192, "hidden_dim": 192, "user_hidden_1": 512, "user_hidden_2": 256, "item_hidden_1": 512, "item_hidden_2": 256, "dropout": 0.05, "epochs": 1, "learning_rate": 0.001, "weight_decay": 1e-05, "gradient_clip": 2.0, "loss_microbatch_size": 65536, "uniform_negatives": 0, "inbatch_negatives": 32, "inbatch_correction_power": 0.0, "inbatch_correction_min": 0.25, "inbatch_correction_max": 4.0, "negative_filter_scope": "full-training-history", "target_weighting": "organic-strong", "ordinary_target_weight": 0.25, "organic_strong_target_weight": 1.0, "organic_like_target_weight": 3.0, "discovery_horizon_days": 7, "validation_fraction": 0.1, "max_train_targets_per_user": 128, "max_validation_targets_per_user": 16, "early_stopping_patience": 1, "early_stopping_min_delta": 0.0001, "seed": 29 }, "sequence_tokens": 20056329, "all_next_item_targets": 20047194, "selected_training_targets": 1052953, "selected_validation_targets": 130103, "discarded_old_targets": 18864138, "training_history": [ { "epoch": 1.0, "loss": 0.6181074711906746, "positive_logit": 0.2691950120198846, "negative_logit": -0.351756276415757, "pair_accuracy": 0.6735453469907964, "targets": 1052953.0, "target_weight_sum": 632551.0, "batches": 266.0, "seconds": 138.97853110699998, "validation_loss": 0.5872622786954147, "validation_targets": 130103.0, "validation_target_weight_sum": 78769.25, "validation_seconds": 11.205245333999983 } ], "embedding_diagnostics": { "query_norm_mean": 1.611833095550537, "query_norm_std": 0.8414639234542847, "item_norm_mean": 1.518686294555664, "item_norm_std": 0.8255314230918884 }, "torch_version": "2.8.0+cpu", "device": "cpu" } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44a6bda2887d2a8e4f101ee908440", "usage": { "input_tokens": 52318, "cached_input_tokens": 51968, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 52369 }, "turn_token_usage": { "input_tokens": 1440223, "cached_input_tokens": 1352192, "cache_write_input_tokens": 0, "output_tokens": 5657, "reasoning_output_tokens": 1370, "total_tokens": 1445880 }, "thread_token_usage": { "input_tokens": 1440223, "cached_input_tokens": 1352192, "cache_write_input_tokens": 0, "output_tokens": 5657, "reasoning_output_tokens": 1370, "total_tokens": 1445880 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-d14559e7-c1ff-442e-9720-b47522b2e475", "process_id": "13988", "command": [ "/bin/sh", "-lc", "/opt/task-venv/bin/python /app/solution/train_current_model.py --stage validation --public-dir /task --prepared-cache /app/solution/validation_cache.npz --output /app/solution/inbatch_validation.parquet --uniform-negatives 0 --inbatch-negatives 32 --inbatch-correction-power 0 --checkpoint-dir /app/solution/inbatch_ckpt" ], "cwd": "file:///app/solution", "parsed_cmd": [ { "type": "unknown", "cmd": "/opt/task-venv/bin/python /app/solution/train_current_model.py --stage validation --public-dir /task --prepared-cache /app/solution/validation_cache.npz --output /app/solution/inbatch_validation.parquet --uniform-negatives 0 --inbatch-negatives 32 --inbatch-correction-power 0 --checkpoint-dir /app/solution/inbatch_ckpt" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "loaded full-sequence cache: tokens=20,056,329 targets=20,047,194\nchronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194\ninbatch correction: min=1.000 mean_on_targets=1.000 max=1.000\ntarget weighting=organic-strong min=0.250 mean=0.575 max=1.000\nfull-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250\nepoch=1/1 batches=250 targets=987,417 batch_bce=0.603578 running_bce=0.620119 elapsed=130.2s\nsaved epoch checkpoint: /app/solution/inbatch_ckpt/epoch-01.pt\nepoch=1/1 train_loss=0.61811 validation_loss=0.58726 pair_accuracy=0.674 train_targets=1,052,953 validation_targets=130,103 train_seconds=139.0 validation_seconds=11.2\nrestored best validation-BCE checkpoint: epoch=1 loss=0.587262\nranked users=1,024/8,456\nranked users=2,048/8,456\nranked users=3,072/8,456\nranked users=4,096/8,456\nranked users=5,120/8,456\nranked users=6,144/8,456\nranked users=7,168/8,456\nranked users=8,192/8,456\nranked users=8,456/8,456\n{\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": \"validation\",\n \"output\": \"/app/solution/inbatch_validation.parquet\",\n \"rows\": 845600,\n \"users\": 8456,\n \"runtime_seconds\": 239.405,\n \"public_inputs_only\": true,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": \"every-adjacent-target-within-recent-chronological-window\",\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": false,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": \"24-uniform-plus-8-propensity-corrected-inbatch\",\n \"false_negative_filter\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\"\n },\n \"config\": {\n \"bptt_steps\": 100,\n \"user_batch_size\": 64,\n \"embedding_dim\": 192,\n \"hidden_dim\": 192,\n \"user_hidden_1\": 512,\n \"user_hidden_2\": 256,\n \"item_hidden_1\": 512,\n \"item_hidden_2\": 256,\n \"dropout\": 0.05,\n \"epochs\": 1,\n \"learning_rate\": 0.001,\n \"weight_decay\": 1e-05,\n \"gradient_clip\": 2.0,\n \"loss_microbatch_size\": 65536,\n \"uniform_negatives\": 0,\n \"inbatch_negatives\": 32,\n \"inbatch_correction_power\": 0.0,\n \"inbatch_correction_min\": 0.25,\n \"inbatch_correction_max\": 4.0,\n \"negative_filter_scope\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\",\n \"ordinary_target_weight\": 0.25,\n \"organic_strong_target_weight\": 1.0,\n \"organic_like_target_weight\": 3.0,\n \"discovery_horizon_days\": 7,\n \"validation_fraction\": 0.1,\n \"max_train_targets_per_user\": 128,\n \"max_validation_targets_per_user\": 16,\n \"early_stopping_patience\": 1,\n \"early_stopping_min_delta\": 0.0001,\n \"seed\": 29\n },\n \"sequence_tokens\": 20056329,\n \"all_next_item_targets\": 20047194,\n \"selected_training_targets\": 1052953,\n \"selected_validation_targets\": 130103,\n \"discarded_old_targets\": 18864138,\n \"training_history\": [\n {\n \"epoch\": 1.0,\n \"loss\": 0.6181074711906746,\n \"positive_logit\": 0.2691950120198846,\n \"negative_logit\": -0.351756276415757,\n \"pair_accuracy\": 0.6735453469907964,\n \"targets\": 1052953.0,\n \"target_weight_sum\": 632551.0,\n \"batches\": 266.0,\n \"seconds\": 138.97853110699998,\n \"validation_loss\": 0.5872622786954147,\n \"validation_targets\": 130103.0,\n \"validation_target_weight_sum\": 78769.25,\n \"validation_seconds\": 11.205245333999983\n }\n ],\n \"embedding_diagnostics\": {\n \"query_norm_mean\": 1.611833095550537,\n \"query_norm_std\": 0.8414639234542847,\n \"item_norm_mean\": 1.518686294555664,\n \"item_norm_std\": 0.8255314230918884\n },\n \"torch_version\": \"2.8.0+cpu\",\n \"device\": \"cpu\"\n}\n", "stderr": "", "aggregated_output": "loaded full-sequence cache: tokens=20,056,329 targets=20,047,194\nchronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194\ninbatch correction: min=1.000 mean_on_targets=1.000 max=1.000\ntarget weighting=organic-strong min=0.250 mean=0.575 max=1.000\nfull-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250\nepoch=1/1 batches=250 targets=987,417 batch_bce=0.603578 running_bce=0.620119 elapsed=130.2s\nsaved epoch checkpoint: /app/solution/inbatch_ckpt/epoch-01.pt\nepoch=1/1 train_loss=0.61811 validation_loss=0.58726 pair_accuracy=0.674 train_targets=1,052,953 validation_targets=130,103 train_seconds=139.0 validation_seconds=11.2\nrestored best validation-BCE checkpoint: epoch=1 loss=0.587262\nranked users=1,024/8,456\nranked users=2,048/8,456\nranked users=3,072/8,456\nranked users=4,096/8,456\nranked users=5,120/8,456\nranked users=6,144/8,456\nranked users=7,168/8,456\nranked users=8,192/8,456\nranked users=8,456/8,456\n{\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": \"validation\",\n \"output\": \"/app/solution/inbatch_validation.parquet\",\n \"rows\": 845600,\n \"users\": 8456,\n \"runtime_seconds\": 239.405,\n \"public_inputs_only\": true,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": \"every-adjacent-target-within-recent-chronological-window\",\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": false,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": \"24-uniform-plus-8-propensity-corrected-inbatch\",\n \"false_negative_filter\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\"\n },\n \"config\": {\n \"bptt_steps\": 100,\n \"user_batch_size\": 64,\n \"embedding_dim\": 192,\n \"hidden_dim\": 192,\n \"user_hidden_1\": 512,\n \"user_hidden_2\": 256,\n \"item_hidden_1\": 512,\n \"item_hidden_2\": 256,\n \"dropout\": 0.05,\n \"epochs\": 1,\n \"learning_rate\": 0.001,\n \"weight_decay\": 1e-05,\n \"gradient_clip\": 2.0,\n \"loss_microbatch_size\": 65536,\n \"uniform_negatives\": 0,\n \"inbatch_negatives\": 32,\n \"inbatch_correction_power\": 0.0,\n \"inbatch_correction_min\": 0.25,\n \"inbatch_correction_max\": 4.0,\n \"negative_filter_scope\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\",\n \"ordinary_target_weight\": 0.25,\n \"organic_strong_target_weight\": 1.0,\n \"organic_like_target_weight\": 3.0,\n \"discovery_horizon_days\": 7,\n \"validation_fraction\": 0.1,\n \"max_train_targets_per_user\": 128,\n \"max_validation_targets_per_user\": 16,\n \"early_stopping_patience\": 1,\n \"early_stopping_min_delta\": 0.0001,\n \"seed\": 29\n },\n \"sequence_tokens\": 20056329,\n \"all_next_item_targets\": 20047194,\n \"selected_training_targets\": 1052953,\n \"selected_validation_targets\": 130103,\n \"discarded_old_targets\": 18864138,\n \"training_history\": [\n {\n \"epoch\": 1.0,\n \"loss\": 0.6181074711906746,\n \"positive_logit\": 0.2691950120198846,\n \"negative_logit\": -0.351756276415757,\n \"pair_accuracy\": 0.6735453469907964,\n \"targets\": 1052953.0,\n \"target_weight_sum\": 632551.0,\n \"batches\": 266.0,\n \"seconds\": 138.97853110699998,\n \"validation_loss\": 0.5872622786954147,\n \"validation_targets\": 130103.0,\n \"validation_target_weight_sum\": 78769.25,\n \"validation_seconds\": 11.205245333999983\n }\n ],\n \"embedding_diagnostics\": {\n \"query_norm_mean\": 1.611833095550537,\n \"query_norm_std\": 0.8414639234542847,\n \"item_norm_mean\": 1.518686294555664,\n \"item_norm_std\": 0.8255314230918884\n },\n \"torch_version\": \"2.8.0+cpu\",\n \"device\": \"cpu\"\n}\n", "exit_code": 0, "duration": { "secs": 244, "nanos": 8478996 }, "formatted_output": "loaded full-sequence cache: tokens=20,056,329 targets=20,047,194\nchronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194\ninbatch correction: min=1.000 mean_on_targets=1.000 max=1.000\ntarget weighting=organic-strong min=0.250 mean=0.575 max=1.000\nfull-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250\nepoch=1/1 batches=250 targets=987,417 batch_bce=0.603578 running_bce=0.620119 elapsed=130.2s\nsaved epoch checkpoint: /app/solution/inbatch_ckpt/epoch-01.pt\nepoch=1/1 train_loss=0.61811 validation_loss=0.58726 pair_accuracy=0.674 train_targets=1,052,953 validation_targets=130,103 train_seconds=139.0 validation_seconds=11.2\nrestored best validation-BCE checkpoint: epoch=1 loss=0.587262\nranked users=1,024/8,456\nranked users=2,048/8,456\nranked users=3,072/8,456\nranked users=4,096/8,456\nranked users=5,120/8,456\nranked users=6,144/8,456\nranked users=7,168/8,456\nranked users=8,192/8,456\nranked users=8,456/8,456\n{\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": \"validation\",\n \"output\": \"/app/solution/inbatch_validation.parquet\",\n \"rows\": 845600,\n \"users\": 8456,\n \"runtime_seconds\": 239.405,\n \"public_inputs_only\": true,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": \"every-adjacent-target-within-recent-chronological-window\",\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": false,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": \"24-uniform-plus-8-propensity-corrected-inbatch\",\n \"false_negative_filter\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\"\n },\n \"config\": {\n \"bptt_steps\": 100,\n \"user_batch_size\": 64,\n \"embedding_dim\": 192,\n \"hidden_dim\": 192,\n \"user_hidden_1\": 512,\n \"user_hidden_2\": 256,\n \"item_hidden_1\": 512,\n \"item_hidden_2\": 256,\n \"dropout\": 0.05,\n \"epochs\": 1,\n \"learning_rate\": 0.001,\n \"weight_decay\": 1e-05,\n \"gradient_clip\": 2.0,\n \"loss_microbatch_size\": 65536,\n \"uniform_negatives\": 0,\n \"inbatch_negatives\": 32,\n \"inbatch_correction_power\": 0.0,\n \"inbatch_correction_min\": 0.25,\n \"inbatch_correction_max\": 4.0,\n \"negative_filter_scope\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\",\n \"ordinary_target_weight\": 0.25,\n \"organic_strong_target_weight\": 1.0,\n \"organic_like_target_weight\": 3.0,\n \"discovery_horizon_days\": 7,\n \"validation_fraction\": 0.1,\n \"max_train_targets_per_user\": 128,\n \"max_validation_targets_per_user\": 16,\n \"early_stopping_patience\": 1,\n \"early_stopping_min_delta\": 0.0001,\n \"seed\": 29\n },\n \"sequence_tokens\": 20056329,\n \"all_next_item_targets\": 20047194,\n \"selected_training_targets\": 1052953,\n \"selected_validation_targets\": 130103,\n \"discarded_old_targets\": 18864138,\n \"training_history\": [\n {\n \"epoch\": 1.0,\n \"loss\": 0.6181074711906746,\n \"positive_logit\": 0.2691950120198846,\n \"negative_logit\": -0.351756276415757,\n \"pair_accuracy\": 0.6735453469907964,\n \"targets\": 1052953.0,\n \"target_weight_sum\": 632551.0,\n \"batches\": 266.0,\n \"seconds\": 138.97853110699998,\n \"validation_loss\": 0.5872622786954147,\n \"validation_targets\": 130103.0,\n \"validation_target_weight_sum\": 78769.25,\n \"validation_seconds\": 11.205245333999983\n }\n ],\n \"embedding_diagnostics\": {\n \"query_norm_mean\": 1.611833095550537,\n \"query_norm_std\": 0.8414639234542847,\n \"item_norm_mean\": 1.518686294555664,\n \"item_norm_std\": 0.8255314230918884\n },\n \"torch_version\": \"2.8.0+cpu\",\n \"device\": \"cpu\"\n}\n" } } ### exec · 2026-09-23T21:54:01.475Z { "code": "const r = await tools.exec_command({cmd:\"/opt/task-venv/bin/python /task/evaluate_public.py /app/solution/inbatch_validation.parquet\",\"workdir\":\"/app\",\"yield_time_ms\":30000,\"max_output_tokens\":3000}); text(r.output)\n" } ### Tool output · 2026-09-23T21:54:05.005Z Script completed Wall time 3.5 seconds Output: { "model": "/app/solution/inbatch_validation.parquet", "scores": { "quality_ndcg@10": 0.013087, "quality_users": 4263 } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44a76a63c87d2aebf50f33868b986", "usage": { "input_tokens": 53483, "cached_input_tokens": 52096, "cache_write_input_tokens": 0, "output_tokens": 68, "reasoning_output_tokens": 0, "total_tokens": 53551 }, "turn_token_usage": { "input_tokens": 1493706, "cached_input_tokens": 1404288, "cache_write_input_tokens": 0, "output_tokens": 5725, "reasoning_output_tokens": 1370, "total_tokens": 1499431 }, "thread_token_usage": { "input_tokens": 1493706, "cached_input_tokens": 1404288, "cache_write_input_tokens": 0, "output_tokens": 5725, "reasoning_output_tokens": 1370, "total_tokens": 1499431 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-201aec76-4931-4549-9d44-e407fd8e1d6d", "process_id": "86252", "command": [ "/bin/sh", "-lc", "/opt/task-venv/bin/python /task/evaluate_public.py /app/solution/inbatch_validation.parquet" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "/opt/task-venv/bin/python /task/evaluate_public.py /app/solution/inbatch_validation.parquet" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "{\n \"model\": \"/app/solution/inbatch_validation.parquet\",\n \"scores\": {\n \"quality_ndcg@10\": 0.013087,\n \"quality_users\": 4263\n }\n}\n", "stderr": "", "aggregated_output": "{\n \"model\": \"/app/solution/inbatch_validation.parquet\",\n \"scores\": {\n \"quality_ndcg@10\": 0.013087,\n \"quality_users\": 4263\n }\n}\n", "exit_code": 0, "duration": { "secs": 3, "nanos": 360292592 }, "formatted_output": "{\n \"model\": \"/app/solution/inbatch_validation.parquet\",\n \"scores\": {\n \"quality_ndcg@10\": 0.013087,\n \"quality_users\": 4263\n }\n}\n" } } ## Step 35 · agent · 2026-09-23T21:54:22.380Z ### Thinking unavailable — no text recorded ## Step 36 · agent · 2026-09-23T21:54:30.571Z ### Thinking unavailable — no text recorded The all-in-batch result fell to 0.01309, which is useful: realistic negatives without propensity handling over-penalize popular tracks and erase too much of the catalog prior. I’m keeping the baseline balance and moving to semi-hard mining: draw a larger in-batch proposal pool, retain only the highest-scoring competitors for each user, and retain the existing frequency correction plus full-history filtering. ### exec · 2026-09-23T21:54:35.415Z { "code": "const r = await tools.exec_command({cmd:\"sed -n '1515,1785p' /app/solution/train_current_model.py\",\"workdir\":\"/app\",\"yield_time_ms\":10000,\"max_output_tokens\":20000}); text(r.output)\n" } ### Tool output · 2026-09-23T21:54:35.495Z Script completed Wall time 0.0 seconds Output: path, ) log(f"saved epoch checkpoint: {path}") return path def train_model( public: Path, stage: str, prepared: SequenceData, config: Config, device: torch.device, checkpoint_dir: Path | None, resume_checkpoint: Path | None, ) -> tuple[base.SequentialTwoTower, list[dict[str, float]]]: partition = chronological_target_partition( prepared, config.validation_fraction, config.max_train_targets_per_user, config.max_validation_targets_per_user, ) training_counts = partition.training_counts validation_counts = partition.validation_counts log( f"chronological BCE window: train={int(training_counts.sum()):,} " f"validation={int(validation_counts.sum()):,} " f"selected={partition.selected_count:,} " f"discarded_old_targets={int(partition.window_starts.sum()):,} " f"all={prepared.target_count:,}" ) model = base.SequentialTwoTower(prepared.item_features, model_config(config)).to( device ) optimizer = torch.optim.AdamW( model.parameters(), lr=config.learning_rate, weight_decay=config.weight_decay ) generator = torch.Generator(device="cpu").manual_seed(config.seed + 10_000) item_correction = build_item_correction( prepared, config, partition.window_starts, training_counts, ) target_weights = build_target_weights( public, stage, prepared, partition.history_training_counts, config, ) known_positive_packed = ( build_known_positive_filter(prepared, partition.history_training_counts) if config.negative_filter_scope == "full-training-history" else None ) history: list[dict[str, float]] = [] best_loss = float("inf") best_epoch = 0 best_state: dict[str, torch.Tensor] | None = None epochs_without_improvement = 0 start_epoch = 0 if resume_checkpoint is not None: payload = torch.load( resume_checkpoint, map_location=device, weights_only=False ) stored_config = payload.get("config", {}) architecture_fields = ( "bptt_steps", "embedding_dim", "hidden_dim", "user_hidden_1", "user_hidden_2", "item_hidden_1", "item_hidden_2", ) mismatches = { name: (stored_config.get(name), getattr(config, name)) for name in architecture_fields if stored_config.get(name) != getattr(config, name) } if mismatches: raise RuntimeError( f"resume checkpoint architecture differs: {mismatches}" ) stored_filter_scope = stored_config.get( "negative_filter_scope", "last-100" ) stored_target_weighting = stored_config.get( "target_weighting", "uniform" ) stored_weight_values = ( stored_config.get("ordinary_target_weight", 1.0), stored_config.get("organic_strong_target_weight", 1.0), stored_config.get("organic_like_target_weight", 3.0), stored_config.get("discovery_horizon_days", 7), ) current_weight_values = ( config.ordinary_target_weight, config.organic_strong_target_weight, config.organic_like_target_weight, config.discovery_horizon_days, ) stored_window_values = ( stored_config.get("validation_fraction", 0.10), stored_config.get("max_train_targets_per_user", 0), stored_config.get("max_validation_targets_per_user", 0), ) current_window_values = ( config.validation_fraction, config.max_train_targets_per_user, config.max_validation_targets_per_user, ) objective_changed = ( stored_filter_scope != config.negative_filter_scope or stored_target_weighting != config.target_weighting or stored_weight_values != current_weight_values or stored_window_values != current_window_values ) model.load_state_dict(payload["model_state"]) if "optimizer_state" in payload and not objective_changed: optimizer.load_state_dict(payload["optimizer_state"]) for group in optimizer.param_groups: group["lr"] = config.learning_rate group["weight_decay"] = config.weight_decay log(f"restored optimizer state from {resume_checkpoint}") else: log( f"using a fresh AdamW optimizer after loading {resume_checkpoint}" ) if "generator_state" in payload and not objective_changed: generator.set_state(payload["generator_state"]) start_epoch = int(payload["epoch"]) if start_epoch >= config.epochs: raise RuntimeError( f"resume epoch {start_epoch} must be below --epochs {config.epochs}" ) prior = { str(name): float(value) for name, value in payload.get("diagnostics", {}).items() } if objective_changed: prior.pop("validation_loss", None) log( "BCE objective changed: filter " f"{stored_filter_scope}->{config.negative_filter_scope}, " "target weighting " f"{stored_target_weighting}->{config.target_weighting}, " f"target window {stored_window_values}->{current_window_values}; " "recomputing the resume checkpoint's validation BCE" ) if "validation_loss" not in prior: prior.update( evaluate_validation_bce( model, prepared, config, target_weights, partition.window_starts, training_counts, validation_counts, item_correction, known_positive_packed, device, ) ) history.append(prior) best_loss = float(prior["validation_loss"]) best_epoch = start_epoch best_state = snapshot_model(model) log( f"resumed validation-BCE training: epoch={start_epoch} " f"loss={best_loss:.6f}" ) for epoch in range(start_epoch + 1, config.epochs + 1): diagnostics = run_training_epoch( model, optimizer, prepared, config, target_weights, partition.window_starts, training_counts, item_correction, known_positive_packed, generator, device, epoch, ) validation = evaluate_validation_bce( model, prepared, config, target_weights, partition.window_starts, training_counts, validation_counts, item_correction, known_positive_packed, device, ) diagnostics.update(validation) history.append(diagnostics) current_state = snapshot_model(model) if checkpoint_dir is not None: save_epoch_checkpoint( checkpoint_dir, epoch, current_state, config, diagnostics, optimizer, generator, ) improved = ( diagnostics["validation_loss"] < best_loss - config.early_stopping_min_delta ) if improved: best_loss = diagnostics["validation_loss"] best_epoch = epoch best_state = current_state epochs_without_improvement = 0 if checkpoint_dir is not None: torch.save( { "epoch": epoch, "config": asdict(config), "diagnostics": diagnostics, "model_state": current_state, "optimizer_state": optimizer.state_dict(), "generator_state": generator.get_state(), }, checkpoint_dir / "best.pt", ) else: epochs_without_improvement += 1 log( f"epoch={epoch}/{config.epochs} train_loss={diagnostics['loss']:.5f} " f"validation_loss={diagnostics['validation_loss']:.5f} " f"pair_accuracy={diagnostics['pair_accuracy']:.3f} " f"train_targets={int(diagnostics['targets']):,} " f"validation_targets={int(diagnostics['validation_targets']):,} " f"train_seconds={diagnostics['seconds']:.1f} " f"validation_seconds={diagnostics['validation_seconds']:.1f}" ) release_accelerator_cache(device) if epochs_without_improvement >= config.early_stopping_patience: log( f"early stopping after epoch={epoch}; " f"best_epoch={best_epoch} best_validation_loss={best_loss:.6f}" ) break if best_state is None: raise RuntimeError("training did not produce a valid checkpoint") model.load_state_dict(best_state) model.to(device).eval() log( f"restored best validation-BCE checkpoint: epoch={best_epoch} " f"loss={best_loss:.6f}" ) return model, history @torch.inference_mode() def inference_queries( model: base.SequentialTwoTower, prepared: SequenceData, config: Config, ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-c94e0c01-bad9-4428-8707-b59675cb6d10", "process_id": "45682", "command": [ "/bin/sh", "-lc", "sed -n '1515,1785p' /app/solution/train_current_model.py" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "read", "cmd": "sed -n '1515,1785p' /app/solution/train_current_model.py", "name": "train_current_model.py", "path": "/app/solution/train_current_model.py" } ], "source": "unified_exec_startup", "status": "completed", "stdout": " path,\n )\n log(f\"saved epoch checkpoint: {path}\")\n return path\n\n\ndef train_model(\n public: Path,\n stage: str,\n prepared: SequenceData,\n config: Config,\n device: torch.device,\n checkpoint_dir: Path | None,\n resume_checkpoint: Path | None,\n) -> tuple[base.SequentialTwoTower, list[dict[str, float]]]:\n partition = chronological_target_partition(\n prepared,\n config.validation_fraction,\n config.max_train_targets_per_user,\n config.max_validation_targets_per_user,\n )\n training_counts = partition.training_counts\n validation_counts = partition.validation_counts\n log(\n f\"chronological BCE window: train={int(training_counts.sum()):,} \"\n f\"validation={int(validation_counts.sum()):,} \"\n f\"selected={partition.selected_count:,} \"\n f\"discarded_old_targets={int(partition.window_starts.sum()):,} \"\n f\"all={prepared.target_count:,}\"\n )\n model = base.SequentialTwoTower(prepared.item_features, model_config(config)).to(\n device\n )\n optimizer = torch.optim.AdamW(\n model.parameters(), lr=config.learning_rate, weight_decay=config.weight_decay\n )\n generator = torch.Generator(device=\"cpu\").manual_seed(config.seed + 10_000)\n item_correction = build_item_correction(\n prepared,\n config,\n partition.window_starts,\n training_counts,\n )\n target_weights = build_target_weights(\n public,\n stage,\n prepared,\n partition.history_training_counts,\n config,\n )\n known_positive_packed = (\n build_known_positive_filter(prepared, partition.history_training_counts)\n if config.negative_filter_scope == \"full-training-history\"\n else None\n )\n history: list[dict[str, float]] = []\n best_loss = float(\"inf\")\n best_epoch = 0\n best_state: dict[str, torch.Tensor] | None = None\n epochs_without_improvement = 0\n start_epoch = 0\n\n if resume_checkpoint is not None:\n payload = torch.load(\n resume_checkpoint, map_location=device, weights_only=False\n )\n stored_config = payload.get(\"config\", {})\n architecture_fields = (\n \"bptt_steps\",\n \"embedding_dim\",\n \"hidden_dim\",\n \"user_hidden_1\",\n \"user_hidden_2\",\n \"item_hidden_1\",\n \"item_hidden_2\",\n )\n mismatches = {\n name: (stored_config.get(name), getattr(config, name))\n for name in architecture_fields\n if stored_config.get(name) != getattr(config, name)\n }\n if mismatches:\n raise RuntimeError(\n f\"resume checkpoint architecture differs: {mismatches}\"\n )\n stored_filter_scope = stored_config.get(\n \"negative_filter_scope\", \"last-100\"\n )\n stored_target_weighting = stored_config.get(\n \"target_weighting\", \"uniform\"\n )\n stored_weight_values = (\n stored_config.get(\"ordinary_target_weight\", 1.0),\n stored_config.get(\"organic_strong_target_weight\", 1.0),\n stored_config.get(\"organic_like_target_weight\", 3.0),\n stored_config.get(\"discovery_horizon_days\", 7),\n )\n current_weight_values = (\n config.ordinary_target_weight,\n config.organic_strong_target_weight,\n config.organic_like_target_weight,\n config.discovery_horizon_days,\n )\n stored_window_values = (\n stored_config.get(\"validation_fraction\", 0.10),\n stored_config.get(\"max_train_targets_per_user\", 0),\n stored_config.get(\"max_validation_targets_per_user\", 0),\n )\n current_window_values = (\n config.validation_fraction,\n config.max_train_targets_per_user,\n config.max_validation_targets_per_user,\n )\n objective_changed = (\n stored_filter_scope != config.negative_filter_scope\n or stored_target_weighting != config.target_weighting\n or stored_weight_values != current_weight_values\n or stored_window_values != current_window_values\n )\n model.load_state_dict(payload[\"model_state\"])\n if \"optimizer_state\" in payload and not objective_changed:\n optimizer.load_state_dict(payload[\"optimizer_state\"])\n for group in optimizer.param_groups:\n group[\"lr\"] = config.learning_rate\n group[\"weight_decay\"] = config.weight_decay\n log(f\"restored optimizer state from {resume_checkpoint}\")\n else:\n log(\n f\"using a fresh AdamW optimizer after loading {resume_checkpoint}\"\n )\n if \"generator_state\" in payload and not objective_changed:\n generator.set_state(payload[\"generator_state\"])\n start_epoch = int(payload[\"epoch\"])\n if start_epoch >= config.epochs:\n raise RuntimeError(\n f\"resume epoch {start_epoch} must be below --epochs {config.epochs}\"\n )\n prior = {\n str(name): float(value)\n for name, value in payload.get(\"diagnostics\", {}).items()\n }\n if objective_changed:\n prior.pop(\"validation_loss\", None)\n log(\n \"BCE objective changed: filter \"\n f\"{stored_filter_scope}->{config.negative_filter_scope}, \"\n \"target weighting \"\n f\"{stored_target_weighting}->{config.target_weighting}, \"\n f\"target window {stored_window_values}->{current_window_values}; \"\n \"recomputing the resume checkpoint's validation BCE\"\n )\n if \"validation_loss\" not in prior:\n prior.update(\n evaluate_validation_bce(\n model,\n prepared,\n config,\n target_weights,\n partition.window_starts,\n training_counts,\n validation_counts,\n item_correction,\n known_positive_packed,\n device,\n )\n )\n history.append(prior)\n best_loss = float(prior[\"validation_loss\"])\n best_epoch = start_epoch\n best_state = snapshot_model(model)\n log(\n f\"resumed validation-BCE training: epoch={start_epoch} \"\n f\"loss={best_loss:.6f}\"\n )\n\n for epoch in range(start_epoch + 1, config.epochs + 1):\n diagnostics = run_training_epoch(\n model,\n optimizer,\n prepared,\n config,\n target_weights,\n partition.window_starts,\n training_counts,\n item_correction,\n known_positive_packed,\n generator,\n device,\n epoch,\n )\n validation = evaluate_validation_bce(\n model,\n prepared,\n config,\n target_weights,\n partition.window_starts,\n training_counts,\n validation_counts,\n item_correction,\n known_positive_packed,\n device,\n )\n diagnostics.update(validation)\n history.append(diagnostics)\n current_state = snapshot_model(model)\n if checkpoint_dir is not None:\n save_epoch_checkpoint(\n checkpoint_dir,\n epoch,\n current_state,\n config,\n diagnostics,\n optimizer,\n generator,\n )\n improved = (\n diagnostics[\"validation_loss\"]\n < best_loss - config.early_stopping_min_delta\n )\n if improved:\n best_loss = diagnostics[\"validation_loss\"]\n best_epoch = epoch\n best_state = current_state\n epochs_without_improvement = 0\n if checkpoint_dir is not None:\n torch.save(\n {\n \"epoch\": epoch,\n \"config\": asdict(config),\n \"diagnostics\": diagnostics,\n \"model_state\": current_state,\n \"optimizer_state\": optimizer.state_dict(),\n \"generator_state\": generator.get_state(),\n },\n checkpoint_dir / \"best.pt\",\n )\n else:\n epochs_without_improvement += 1\n log(\n f\"epoch={epoch}/{config.epochs} train_loss={diagnostics['loss']:.5f} \"\n f\"validation_loss={diagnostics['validation_loss']:.5f} \"\n f\"pair_accuracy={diagnostics['pair_accuracy']:.3f} \"\n f\"train_targets={int(diagnostics['targets']):,} \"\n f\"validation_targets={int(diagnostics['validation_targets']):,} \"\n f\"train_seconds={diagnostics['seconds']:.1f} \"\n f\"validation_seconds={diagnostics['validation_seconds']:.1f}\"\n )\n release_accelerator_cache(device)\n if epochs_without_improvement >= config.early_stopping_patience:\n log(\n f\"early stopping after epoch={epoch}; \"\n f\"best_epoch={best_epoch} best_validation_loss={best_loss:.6f}\"\n )\n break\n\n if best_state is None:\n raise RuntimeError(\"training did not produce a valid checkpoint\")\n model.load_state_dict(best_state)\n model.to(device).eval()\n log(\n f\"restored best validation-BCE checkpoint: epoch={best_epoch} \"\n f\"loss={best_loss:.6f}\"\n )\n return model, history\n\n\n@torch.inference_mode()\ndef inference_queries(\n model: base.SequentialTwoTower,\n prepared: SequenceData,\n config: Config,\n", "stderr": "", "aggregated_output": " path,\n )\n log(f\"saved epoch checkpoint: {path}\")\n return path\n\n\ndef train_model(\n public: Path,\n stage: str,\n prepared: SequenceData,\n config: Config,\n device: torch.device,\n checkpoint_dir: Path | None,\n resume_checkpoint: Path | None,\n) -> tuple[base.SequentialTwoTower, list[dict[str, float]]]:\n partition = chronological_target_partition(\n prepared,\n config.validation_fraction,\n config.max_train_targets_per_user,\n config.max_validation_targets_per_user,\n )\n training_counts = partition.training_counts\n validation_counts = partition.validation_counts\n log(\n f\"chronological BCE window: train={int(training_counts.sum()):,} \"\n f\"validation={int(validation_counts.sum()):,} \"\n f\"selected={partition.selected_count:,} \"\n f\"discarded_old_targets={int(partition.window_starts.sum()):,} \"\n f\"all={prepared.target_count:,}\"\n )\n model = base.SequentialTwoTower(prepared.item_features, model_config(config)).to(\n device\n )\n optimizer = torch.optim.AdamW(\n model.parameters(), lr=config.learning_rate, weight_decay=config.weight_decay\n )\n generator = torch.Generator(device=\"cpu\").manual_seed(config.seed + 10_000)\n item_correction = build_item_correction(\n prepared,\n config,\n partition.window_starts,\n training_counts,\n )\n target_weights = build_target_weights(\n public,\n stage,\n prepared,\n partition.history_training_counts,\n config,\n )\n known_positive_packed = (\n build_known_positive_filter(prepared, partition.history_training_counts)\n if config.negative_filter_scope == \"full-training-history\"\n else None\n )\n history: list[dict[str, float]] = []\n best_loss = float(\"inf\")\n best_epoch = 0\n best_state: dict[str, torch.Tensor] | None = None\n epochs_without_improvement = 0\n start_epoch = 0\n\n if resume_checkpoint is not None:\n payload = torch.load(\n resume_checkpoint, map_location=device, weights_only=False\n )\n stored_config = payload.get(\"config\", {})\n architecture_fields = (\n \"bptt_steps\",\n \"embedding_dim\",\n \"hidden_dim\",\n \"user_hidden_1\",\n \"user_hidden_2\",\n \"item_hidden_1\",\n \"item_hidden_2\",\n )\n mismatches = {\n name: (stored_config.get(name), getattr(config, name))\n for name in architecture_fields\n if stored_config.get(name) != getattr(config, name)\n }\n if mismatches:\n raise RuntimeError(\n f\"resume checkpoint architecture differs: {mismatches}\"\n )\n stored_filter_scope = stored_config.get(\n \"negative_filter_scope\", \"last-100\"\n )\n stored_target_weighting = stored_config.get(\n \"target_weighting\", \"uniform\"\n )\n stored_weight_values = (\n stored_config.get(\"ordinary_target_weight\", 1.0),\n stored_config.get(\"organic_strong_target_weight\", 1.0),\n stored_config.get(\"organic_like_target_weight\", 3.0),\n stored_config.get(\"discovery_horizon_days\", 7),\n )\n current_weight_values = (\n config.ordinary_target_weight,\n config.organic_strong_target_weight,\n config.organic_like_target_weight,\n config.discovery_horizon_days,\n )\n stored_window_values = (\n stored_config.get(\"validation_fraction\", 0.10),\n stored_config.get(\"max_train_targets_per_user\", 0),\n stored_config.get(\"max_validation_targets_per_user\", 0),\n )\n current_window_values = (\n config.validation_fraction,\n config.max_train_targets_per_user,\n config.max_validation_targets_per_user,\n )\n objective_changed = (\n stored_filter_scope != config.negative_filter_scope\n or stored_target_weighting != config.target_weighting\n or stored_weight_values != current_weight_values\n or stored_window_values != current_window_values\n )\n model.load_state_dict(payload[\"model_state\"])\n if \"optimizer_state\" in payload and not objective_changed:\n optimizer.load_state_dict(payload[\"optimizer_state\"])\n for group in optimizer.param_groups:\n group[\"lr\"] = config.learning_rate\n group[\"weight_decay\"] = config.weight_decay\n log(f\"restored optimizer state from {resume_checkpoint}\")\n else:\n log(\n f\"using a fresh AdamW optimizer after loading {resume_checkpoint}\"\n )\n if \"generator_state\" in payload and not objective_changed:\n generator.set_state(payload[\"generator_state\"])\n start_epoch = int(payload[\"epoch\"])\n if start_epoch >= config.epochs:\n raise RuntimeError(\n f\"resume epoch {start_epoch} must be below --epochs {config.epochs}\"\n )\n prior = {\n str(name): float(value)\n for name, value in payload.get(\"diagnostics\", {}).items()\n }\n if objective_changed:\n prior.pop(\"validation_loss\", None)\n log(\n \"BCE objective changed: filter \"\n f\"{stored_filter_scope}->{config.negative_filter_scope}, \"\n \"target weighting \"\n f\"{stored_target_weighting}->{config.target_weighting}, \"\n f\"target window {stored_window_values}->{current_window_values}; \"\n \"recomputing the resume checkpoint's validation BCE\"\n )\n if \"validation_loss\" not in prior:\n prior.update(\n evaluate_validation_bce(\n model,\n prepared,\n config,\n target_weights,\n partition.window_starts,\n training_counts,\n validation_counts,\n item_correction,\n known_positive_packed,\n device,\n )\n )\n history.append(prior)\n best_loss = float(prior[\"validation_loss\"])\n best_epoch = start_epoch\n best_state = snapshot_model(model)\n log(\n f\"resumed validation-BCE training: epoch={start_epoch} \"\n f\"loss={best_loss:.6f}\"\n )\n\n for epoch in range(start_epoch + 1, config.epochs + 1):\n diagnostics = run_training_epoch(\n model,\n optimizer,\n prepared,\n config,\n target_weights,\n partition.window_starts,\n training_counts,\n item_correction,\n known_positive_packed,\n generator,\n device,\n epoch,\n )\n validation = evaluate_validation_bce(\n model,\n prepared,\n config,\n target_weights,\n partition.window_starts,\n training_counts,\n validation_counts,\n item_correction,\n known_positive_packed,\n device,\n )\n diagnostics.update(validation)\n history.append(diagnostics)\n current_state = snapshot_model(model)\n if checkpoint_dir is not None:\n save_epoch_checkpoint(\n checkpoint_dir,\n epoch,\n current_state,\n config,\n diagnostics,\n optimizer,\n generator,\n )\n improved = (\n diagnostics[\"validation_loss\"]\n < best_loss - config.early_stopping_min_delta\n )\n if improved:\n best_loss = diagnostics[\"validation_loss\"]\n best_epoch = epoch\n best_state = current_state\n epochs_without_improvement = 0\n if checkpoint_dir is not None:\n torch.save(\n {\n \"epoch\": epoch,\n \"config\": asdict(config),\n \"diagnostics\": diagnostics,\n \"model_state\": current_state,\n \"optimizer_state\": optimizer.state_dict(),\n \"generator_state\": generator.get_state(),\n },\n checkpoint_dir / \"best.pt\",\n )\n else:\n epochs_without_improvement += 1\n log(\n f\"epoch={epoch}/{config.epochs} train_loss={diagnostics['loss']:.5f} \"\n f\"validation_loss={diagnostics['validation_loss']:.5f} \"\n f\"pair_accuracy={diagnostics['pair_accuracy']:.3f} \"\n f\"train_targets={int(diagnostics['targets']):,} \"\n f\"validation_targets={int(diagnostics['validation_targets']):,} \"\n f\"train_seconds={diagnostics['seconds']:.1f} \"\n f\"validation_seconds={diagnostics['validation_seconds']:.1f}\"\n )\n release_accelerator_cache(device)\n if epochs_without_improvement >= config.early_stopping_patience:\n log(\n f\"early stopping after epoch={epoch}; \"\n f\"best_epoch={best_epoch} best_validation_loss={best_loss:.6f}\"\n )\n break\n\n if best_state is None:\n raise RuntimeError(\"training did not produce a valid checkpoint\")\n model.load_state_dict(best_state)\n model.to(device).eval()\n log(\n f\"restored best validation-BCE checkpoint: epoch={best_epoch} \"\n f\"loss={best_loss:.6f}\"\n )\n return model, history\n\n\n@torch.inference_mode()\ndef inference_queries(\n model: base.SequentialTwoTower,\n prepared: SequenceData,\n config: Config,\n", "exit_code": 0, "duration": { "secs": 0, "nanos": 4911 }, "formatted_output": " path,\n )\n log(f\"saved epoch checkpoint: {path}\")\n return path\n\n\ndef train_model(\n public: Path,\n stage: str,\n prepared: SequenceData,\n config: Config,\n device: torch.device,\n checkpoint_dir: Path | None,\n resume_checkpoint: Path | None,\n) -> tuple[base.SequentialTwoTower, list[dict[str, float]]]:\n partition = chronological_target_partition(\n prepared,\n config.validation_fraction,\n config.max_train_targets_per_user,\n config.max_validation_targets_per_user,\n )\n training_counts = partition.training_counts\n validation_counts = partition.validation_counts\n log(\n f\"chronological BCE window: train={int(training_counts.sum()):,} \"\n f\"validation={int(validation_counts.sum()):,} \"\n f\"selected={partition.selected_count:,} \"\n f\"discarded_old_targets={int(partition.window_starts.sum()):,} \"\n f\"all={prepared.target_count:,}\"\n )\n model = base.SequentialTwoTower(prepared.item_features, model_config(config)).to(\n device\n )\n optimizer = torch.optim.AdamW(\n model.parameters(), lr=config.learning_rate, weight_decay=config.weight_decay\n )\n generator = torch.Generator(device=\"cpu\").manual_seed(config.seed + 10_000)\n item_correction = build_item_correction(\n prepared,\n config,\n partition.window_starts,\n training_counts,\n )\n target_weights = build_target_weights(\n public,\n stage,\n prepared,\n partition.history_training_counts,\n config,\n )\n known_positive_packed = (\n build_known_positive_filter(prepared, partition.history_training_counts)\n if config.negative_filter_scope == \"full-training-history\"\n else None\n )\n history: list[dict[str, float]] = []\n best_loss = float(\"inf\")\n best_epoch = 0\n best_state: dict[str, torch.Tensor] | None = None\n epochs_without_improvement = 0\n start_epoch = 0\n\n if resume_checkpoint is not None:\n payload = torch.load(\n resume_checkpoint, map_location=device, weights_only=False\n )\n stored_config = payload.get(\"config\", {})\n architecture_fields = (\n \"bptt_steps\",\n \"embedding_dim\",\n \"hidden_dim\",\n \"user_hidden_1\",\n \"user_hidden_2\",\n \"item_hidden_1\",\n \"item_hidden_2\",\n )\n mismatches = {\n name: (stored_config.get(name), getattr(config, name))\n for name in architecture_fields\n if stored_config.get(name) != getattr(config, name)\n }\n if mismatches:\n raise RuntimeError(\n f\"resume checkpoint architecture differs: {mismatches}\"\n )\n stored_filter_scope = stored_config.get(\n \"negative_filter_scope\", \"last-100\"\n )\n stored_target_weighting = stored_config.get(\n \"target_weighting\", \"uniform\"\n )\n stored_weight_values = (\n stored_config.get(\"ordinary_target_weight\", 1.0),\n stored_config.get(\"organic_strong_target_weight\", 1.0),\n stored_config.get(\"organic_like_target_weight\", 3.0),\n stored_config.get(\"discovery_horizon_days\", 7),\n )\n current_weight_values = (\n config.ordinary_target_weight,\n config.organic_strong_target_weight,\n config.organic_like_target_weight,\n config.discovery_horizon_days,\n )\n stored_window_values = (\n stored_config.get(\"validation_fraction\", 0.10),\n stored_config.get(\"max_train_targets_per_user\", 0),\n stored_config.get(\"max_validation_targets_per_user\", 0),\n )\n current_window_values = (\n config.validation_fraction,\n config.max_train_targets_per_user,\n config.max_validation_targets_per_user,\n )\n objective_changed = (\n stored_filter_scope != config.negative_filter_scope\n or stored_target_weighting != config.target_weighting\n or stored_weight_values != current_weight_values\n or stored_window_values != current_window_values\n )\n model.load_state_dict(payload[\"model_state\"])\n if \"optimizer_state\" in payload and not objective_changed:\n optimizer.load_state_dict(payload[\"optimizer_state\"])\n for group in optimizer.param_groups:\n group[\"lr\"] = config.learning_rate\n group[\"weight_decay\"] = config.weight_decay\n log(f\"restored optimizer state from {resume_checkpoint}\")\n else:\n log(\n f\"using a fresh AdamW optimizer after loading {resume_checkpoint}\"\n )\n if \"generator_state\" in payload and not objective_changed:\n generator.set_state(payload[\"generator_state\"])\n start_epoch = int(payload[\"epoch\"])\n if start_epoch >= config.epochs:\n raise RuntimeError(\n f\"resume epoch {start_epoch} must be below --epochs {config.epochs}\"\n )\n prior = {\n str(name): float(value)\n for name, value in payload.get(\"diagnostics\", {}).items()\n }\n if objective_changed:\n prior.pop(\"validation_loss\", None)\n log(\n \"BCE objective changed: filter \"\n f\"{stored_filter_scope}->{config.negative_filter_scope}, \"\n \"target weighting \"\n f\"{stored_target_weighting}->{config.target_weighting}, \"\n f\"target window {stored_window_values}->{current_window_values}; \"\n \"recomputing the resume checkpoint's validation BCE\"\n )\n if \"validation_loss\" not in prior:\n prior.update(\n evaluate_validation_bce(\n model,\n prepared,\n config,\n target_weights,\n partition.window_starts,\n training_counts,\n validation_counts,\n item_correction,\n known_positive_packed,\n device,\n )\n )\n history.append(prior)\n best_loss = float(prior[\"validation_loss\"])\n best_epoch = start_epoch\n best_state = snapshot_model(model)\n log(\n f\"resumed validation-BCE training: epoch={start_epoch} \"\n f\"loss={best_loss:.6f}\"\n )\n\n for epoch in range(start_epoch + 1, config.epochs + 1):\n diagnostics = run_training_epoch(\n model,\n optimizer,\n prepared,\n config,\n target_weights,\n partition.window_starts,\n training_counts,\n item_correction,\n known_positive_packed,\n generator,\n device,\n epoch,\n )\n validation = evaluate_validation_bce(\n model,\n prepared,\n config,\n target_weights,\n partition.window_starts,\n training_counts,\n validation_counts,\n item_correction,\n known_positive_packed,\n device,\n )\n diagnostics.update(validation)\n history.append(diagnostics)\n current_state = snapshot_model(model)\n if checkpoint_dir is not None:\n save_epoch_checkpoint(\n checkpoint_dir,\n epoch,\n current_state,\n config,\n diagnostics,\n optimizer,\n generator,\n )\n improved = (\n diagnostics[\"validation_loss\"]\n < best_loss - config.early_stopping_min_delta\n )\n if improved:\n best_loss = diagnostics[\"validation_loss\"]\n best_epoch = epoch\n best_state = current_state\n epochs_without_improvement = 0\n if checkpoint_dir is not None:\n torch.save(\n {\n \"epoch\": epoch,\n \"config\": asdict(config),\n \"diagnostics\": diagnostics,\n \"model_state\": current_state,\n \"optimizer_state\": optimizer.state_dict(),\n \"generator_state\": generator.get_state(),\n },\n checkpoint_dir / \"best.pt\",\n )\n else:\n epochs_without_improvement += 1\n log(\n f\"epoch={epoch}/{config.epochs} train_loss={diagnostics['loss']:.5f} \"\n f\"validation_loss={diagnostics['validation_loss']:.5f} \"\n f\"pair_accuracy={diagnostics['pair_accuracy']:.3f} \"\n f\"train_targets={int(diagnostics['targets']):,} \"\n f\"validation_targets={int(diagnostics['validation_targets']):,} \"\n f\"train_seconds={diagnostics['seconds']:.1f} \"\n f\"validation_seconds={diagnostics['validation_seconds']:.1f}\"\n )\n release_accelerator_cache(device)\n if epochs_without_improvement >= config.early_stopping_patience:\n log(\n f\"early stopping after epoch={epoch}; \"\n f\"best_epoch={best_epoch} best_validation_loss={best_loss:.6f}\"\n )\n break\n\n if best_state is None:\n raise RuntimeError(\"training did not produce a valid checkpoint\")\n model.load_state_dict(best_state)\n model.to(device).eval()\n log(\n f\"restored best validation-BCE checkpoint: epoch={best_epoch} \"\n f\"loss={best_loss:.6f}\"\n )\n return model, history\n\n\n@torch.inference_mode()\ndef inference_queries(\n model: base.SequentialTwoTower,\n prepared: SequenceData,\n config: Config,\n" } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44a7d2ef087d283db03f5d8127b5c", "usage": { "input_tokens": 53620, "cached_input_tokens": 53248, "cache_write_input_tokens": 0, "output_tokens": 927, "reasoning_output_tokens": 771, "total_tokens": 54547 }, "turn_token_usage": { "input_tokens": 1547326, "cached_input_tokens": 1457536, "cache_write_input_tokens": 0, "output_tokens": 6652, "reasoning_output_tokens": 2141, "total_tokens": 1553978 }, "thread_token_usage": { "input_tokens": 1547326, "cached_input_tokens": 1457536, "cache_write_input_tokens": 0, "output_tokens": 6652, "reasoning_output_tokens": 2141, "total_tokens": 1553978 } } ## Step 37 · agent · 2026-09-23T21:54:49.477Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:55:12.364Z { "code": "const patch = \"*** Begin Patch\\n*** Update File: /app/solution/train_current_model.py\\n@@\\n inbatch_negatives: int = 8\\n+ hard_inbatch_pool: int = 0\\n@@\\n def draw_full_history_filtered_negatives(\\n@@\\n- if config.inbatch_negatives:\\n+ inbatch_draw_count = max(config.inbatch_negatives, config.hard_inbatch_pool)\\n+ if inbatch_draw_count:\\n unique_targets = torch.unique(targets.detach().cpu())\\n corrected_count = min(\\n- config.inbatch_negatives, max(len(unique_targets) - 1, 0)\\n+ inbatch_draw_count, max(len(unique_targets) - 1, 0)\\n@@\\n- if corrected_count < config.inbatch_negatives:\\n+ if corrected_count < inbatch_draw_count:\\n filler = torch.randint(\\n n_items,\\n- (batch_size, config.inbatch_negatives - corrected_count),\\n+ (batch_size, inbatch_draw_count - corrected_count),\\n@@\\n def corrected_negative_loss(\\n@@\\n- total = config.uniform_negatives + config.inbatch_negatives\\n+ total = config.uniform_negatives + config.inbatch_negatives\\n@@\\n if config.inbatch_negatives:\\n- selected = slice(config.uniform_negatives, total)\\n- weights = correction[:, selected]\\n+ pool_start = config.uniform_negatives\\n+ pool_size = logits.shape[1] - pool_start\\n+ if config.hard_inbatch_pool:\\n+ if pool_size < config.inbatch_negatives:\\n+ raise RuntimeError(\\\"hard-negative proposal pool is too small\\\")\\n+ columns = torch.topk(\\n+ logits[:, pool_start:], k=config.inbatch_negatives, dim=1\\n+ ).indices\\n+ selected_raw = raw[:, pool_start:].gather(1, columns)\\n+ weights = correction[:, pool_start:].gather(1, columns)\\n+ else:\\n+ selected = slice(pool_start, total)\\n+ selected_raw = raw[:, selected]\\n+ weights = correction[:, selected]\\n result += config.inbatch_negatives * (\\n- (raw[:, selected] * weights).sum(dim=1)\\n+ (selected_raw * weights).sum(dim=1)\\n / weights.sum(dim=1).clamp_min(1.0e-6)\\n )\\n@@\\n parser.add_argument(\\n \\\"--inbatch-negatives\\\", type=int, default=Config.inbatch_negatives\\n )\\n+ parser.add_argument(\\n+ \\\"--hard-inbatch-pool\\\", type=int, default=Config.hard_inbatch_pool,\\n+ help=\\\"draw this many in-batch proposals and train on the highest-scoring subset\\\",\\n+ )\\n@@\\n or args.inbatch_correction_power < 0\\n+ or (args.hard_inbatch_pool and args.hard_inbatch_pool < args.inbatch_negatives)\\n@@\\n inbatch_negatives=args.inbatch_negatives,\\n+ hard_inbatch_pool=args.hard_inbatch_pool,\\n*** End Patch\";\ntext(await tools.apply_patch(patch));\n" } ### Tool output · 2026-09-23T21:55:12.420Z Script completed Wall time 0.0 seconds Output: {} ### Harness context { "type": "codex_item_completed", "item": { "type": "FileChange", "id": "exec-26667366-d3a6-4f04-90c6-8ea060e733d1", "changes": { "/app/solution/train_current_model.py": { "type": "update", "unified_diff": "@@ -57,2 +57,3 @@\n inbatch_negatives: int = 8\n+ hard_inbatch_pool: int = 0\n inbatch_correction_power: float = 0.5\n@@ -652,6 +653,7 @@\n corrected_count = 0\n- if config.inbatch_negatives:\n+ inbatch_draw_count = max(config.inbatch_negatives, config.hard_inbatch_pool)\n+ if inbatch_draw_count:\n unique_targets = torch.unique(targets.detach().cpu())\n corrected_count = min(\n- config.inbatch_negatives, max(len(unique_targets) - 1, 0)\n+ inbatch_draw_count, max(len(unique_targets) - 1, 0)\n )\n@@ -671,6 +673,6 @@\n inbatch = unique_targets[columns]\n- if corrected_count < config.inbatch_negatives:\n+ if corrected_count < inbatch_draw_count:\n filler = torch.randint(\n n_items,\n- (batch_size, config.inbatch_negatives - corrected_count),\n+ (batch_size, inbatch_draw_count - corrected_count),\n generator=generator,\n@@ -857,6 +859,18 @@\n if config.inbatch_negatives:\n- selected = slice(config.uniform_negatives, total)\n- weights = correction[:, selected]\n+ pool_start = config.uniform_negatives\n+ pool_size = logits.shape[1] - pool_start\n+ if config.hard_inbatch_pool:\n+ if pool_size < config.inbatch_negatives:\n+ raise RuntimeError(\"hard-negative proposal pool is too small\")\n+ columns = torch.topk(\n+ logits[:, pool_start:], k=config.inbatch_negatives, dim=1\n+ ).indices\n+ selected_raw = raw[:, pool_start:].gather(1, columns)\n+ weights = correction[:, pool_start:].gather(1, columns)\n+ else:\n+ selected = slice(pool_start, total)\n+ selected_raw = raw[:, selected]\n+ weights = correction[:, selected]\n result += config.inbatch_negatives * (\n- (raw[:, selected] * weights).sum(dim=1)\n+ (selected_raw * weights).sum(dim=1)\n / weights.sum(dim=1).clamp_min(1.0e-6)\n@@ -1944,2 +1958,6 @@\n parser.add_argument(\n+ \"--hard-inbatch-pool\", type=int, default=Config.hard_inbatch_pool,\n+ help=\"draw this many in-batch proposals and train on the highest-scoring subset\",\n+ )\n+ parser.add_argument(\n \"--inbatch-correction-power\",\n@@ -2035,2 +2053,3 @@\n or args.inbatch_correction_power < 0\n+ or (args.hard_inbatch_pool and args.hard_inbatch_pool < args.inbatch_negatives)\n ):\n@@ -2049,2 +2068,3 @@\n inbatch_negatives=args.inbatch_negatives,\n+ hard_inbatch_pool=args.hard_inbatch_pool,\n inbatch_correction_power=args.inbatch_correction_power,\n", "move_path": null } }, "status": "completed", "stdout": "Success. Updated the following files:\nM /app/solution/train_current_model.py\n", "stderr": "" } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44a9bd27887d28c37dba696f921ab", "usage": { "input_tokens": 56463, "cached_input_tokens": 53504, "cache_write_input_tokens": 0, "output_tokens": 1124, "reasoning_output_tokens": 399, "total_tokens": 57587 }, "turn_token_usage": { "input_tokens": 1603789, "cached_input_tokens": 1511040, "cache_write_input_tokens": 0, "output_tokens": 7776, "reasoning_output_tokens": 2540, "total_tokens": 1611565 }, "thread_token_usage": { "input_tokens": 1603789, "cached_input_tokens": 1511040, "cache_write_input_tokens": 0, "output_tokens": 7776, "reasoning_output_tokens": 2540, "total_tokens": 1611565 } } ## Step 38 · agent · 2026-09-23T21:55:16.770Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:55:22.638Z { "code": "const r = await tools.exec_command({cmd:\"/opt/task-venv/bin/python -m py_compile /app/solution/train_current_model.py && PYTHONPATH=/app/solution /opt/task-venv/bin/python - <<'PY'\\nimport torch\\nfrom train_current_model import Config, corrected_negative_loss\\nx=torch.tensor([[0.,1.,2.,3.,4.,5.]])\\nw=torch.ones_like(x)\\nc=Config(uniform_negatives=2,inbatch_negatives=2,hard_inbatch_pool=4)\\nprint(corrected_negative_loss(x,w,c), 'expected', (torch.nn.functional.softplus(x[:,:2]).mean()+torch.nn.functional.softplus(x[:,4:]).mean())/2)\\nPY\",\"workdir\":\"/app\",\"yield_time_ms\":10000,\"max_output_tokens\":3000}); text(r.output)\n" } ### Tool output · 2026-09-23T21:55:27.133Z Script completed Wall time 4.5 seconds Output: tensor([2.7578]) expected tensor(2.7578) ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44ac0b11087d2814063dfa8830783", "usage": { "input_tokens": 57611, "cached_input_tokens": 56320, "cache_write_input_tokens": 0, "output_tokens": 259, "reasoning_output_tokens": 66, "total_tokens": 57870 }, "turn_token_usage": { "input_tokens": 1661400, "cached_input_tokens": 1567360, "cache_write_input_tokens": 0, "output_tokens": 8035, "reasoning_output_tokens": 2606, "total_tokens": 1669435 }, "thread_token_usage": { "input_tokens": 1661400, "cached_input_tokens": 1567360, "cache_write_input_tokens": 0, "output_tokens": 8035, "reasoning_output_tokens": 2606, "total_tokens": 1669435 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-6cff1208-7a62-4b72-ae58-443185cff1ba", "process_id": "99026", "command": [ "/bin/sh", "-lc", "/opt/task-venv/bin/python -m py_compile /app/solution/train_current_model.py && PYTHONPATH=/app/solution /opt/task-venv/bin/python - <<'PY'\nimport torch\nfrom train_current_model import Config, corrected_negative_loss\nx=torch.tensor([[0.,1.,2.,3.,4.,5.]])\nw=torch.ones_like(x)\nc=Config(uniform_negatives=2,inbatch_negatives=2,hard_inbatch_pool=4)\nprint(corrected_negative_loss(x,w,c), 'expected', (torch.nn.functional.softplus(x[:,:2]).mean()+torch.nn.functional.softplus(x[:,4:]).mean())/2)\nPY" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "/opt/task-venv/bin/python -m py_compile /app/solution/train_current_model.py && PYTHONPATH=/app/solution /opt/task-venv/bin/python - <<'PY'\nimport torch\nfrom train_current_model import Config, corrected_negative_loss\nx=torch.tensor([[0.,1.,2.,3.,4.,5.]])\nw=torch.ones_like(x)\nc=Config(uniform_negatives=2,inbatch_negatives=2,hard_inbatch_pool=4)\nprint(corrected_negative_loss(x,w,c), 'expected', (torch.nn.functional.softplus(x[:,:2]).mean()+torch.nn.functional.softplus(x[:,4:]).mean())/2)\nPY" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "tensor([2.7578]) expected tensor(2.7578)\n", "stderr": "", "aggregated_output": "tensor([2.7578]) expected tensor(2.7578)\n", "exit_code": 0, "duration": { "secs": 4, "nanos": 326553865 }, "formatted_output": "tensor([2.7578]) expected tensor(2.7578)\n" } } ## Step 39 · agent · 2026-09-23T21:55:30.381Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:55:34.550Z { "code": "const r = await tools.exec_command({cmd:\"/opt/task-venv/bin/python /app/solution/train_current_model.py --stage validation --public-dir /task --prepared-cache /app/solution/validation_cache.npz --output /app/solution/hard_validation.parquet --uniform-negatives 24 --inbatch-negatives 8 --hard-inbatch-pool 32 --inbatch-correction-power 0.5 --checkpoint-dir /app/solution/hard_ckpt\",\"workdir\":\"/app/solution\",\"yield_time_ms\":1000,\"max_output_tokens\":10000}); text(JSON.stringify(r))\n" } ### Tool output · 2026-09-23T21:55:35.716Z Script completed Wall time 1.2 seconds Output: {"chunk_id":"681400","wall_time_seconds":1.000907668,"session_id":58292,"original_token_count":0,"output":""} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44acf5fb487d2ae135061cd739862", "usage": { "input_tokens": 57908, "cached_input_tokens": 57472, "cache_write_input_tokens": 0, "output_tokens": 167, "reasoning_output_tokens": 28, "total_tokens": 58075 }, "turn_token_usage": { "input_tokens": 1719308, "cached_input_tokens": 1624832, "cache_write_input_tokens": 0, "output_tokens": 8202, "reasoning_output_tokens": 2634, "total_tokens": 1727510 }, "thread_token_usage": { "input_tokens": 1719308, "cached_input_tokens": 1624832, "cache_write_input_tokens": 0, "output_tokens": 8202, "reasoning_output_tokens": 2634, "total_tokens": 1727510 } } ## Step 40 · agent · 2026-09-23T21:55:37.090Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:55:38.506Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:58292,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:56:08.515Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"ddcfc2","wall_time_seconds":30.001903689,"session_id":58292,"original_token_count":103} loaded full-sequence cache: tokens=20,056,329 targets=20,047,194 chronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194 inbatch correction: min=0.250 mean_on_targets=1.001 max=4.000 target weighting=organic-strong min=0.250 mean=0.575 max=1.000 full-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250 ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44ad8053487d2a186e3f8f18d6538", "usage": { "input_tokens": 58131, "cached_input_tokens": 57728, "cache_write_input_tokens": 0, "output_tokens": 59, "reasoning_output_tokens": 6, "total_tokens": 58190 }, "turn_token_usage": { "input_tokens": 1777439, "cached_input_tokens": 1682560, "cache_write_input_tokens": 0, "output_tokens": 8261, "reasoning_output_tokens": 2640, "total_tokens": 1785700 }, "thread_token_usage": { "input_tokens": 1777439, "cached_input_tokens": 1682560, "cache_write_input_tokens": 0, "output_tokens": 8261, "reasoning_output_tokens": 2640, "total_tokens": 1785700 } } ### exec · 2026-09-23T21:56:10.895Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:58292,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:56:40.912Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"b72452","wall_time_seconds":30.000992453,"session_id":58292,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44af8b07487d28676dd8a1a1d990e", "usage": { "input_tokens": 58378, "cached_input_tokens": 57984, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 58429 }, "turn_token_usage": { "input_tokens": 1835817, "cached_input_tokens": 1740544, "cache_write_input_tokens": 0, "output_tokens": 8312, "reasoning_output_tokens": 2640, "total_tokens": 1844129 }, "thread_token_usage": { "input_tokens": 1835817, "cached_input_tokens": 1740544, "cache_write_input_tokens": 0, "output_tokens": 8312, "reasoning_output_tokens": 2640, "total_tokens": 1844129 } } ### exec · 2026-09-23T21:56:43.493Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:58292,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:57:13.518Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"ab8134","wall_time_seconds":30.001324325,"session_id":58292,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44b19358887d2b4e9754e80e908f0", "usage": { "input_tokens": 58482, "cached_input_tokens": 58240, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 58533 }, "turn_token_usage": { "input_tokens": 1894299, "cached_input_tokens": 1798784, "cache_write_input_tokens": 0, "output_tokens": 8363, "reasoning_output_tokens": 2640, "total_tokens": 1902662 }, "thread_token_usage": { "input_tokens": 1894299, "cached_input_tokens": 1798784, "cache_write_input_tokens": 0, "output_tokens": 8363, "reasoning_output_tokens": 2640, "total_tokens": 1902662 } } ## Step 41 · agent · 2026-09-23T21:57:16.982Z ### Thinking unavailable — no text recorded Semi-hard mining is running with 32 in-batch proposals, selecting 8 by current model score, plus the original 24 uniform negatives. This increases training cost modestly but leaves request-time scoring unchanged: the serving artifact is still one user vector, precomputed item vectors, and raw dot products. ### exec · 2026-09-23T21:57:20.032Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:58292,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:57:50.067Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"7cd7d6","wall_time_seconds":30.001366609,"session_id":58292,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44b3aa74087d2838ec05d344b1331", "usage": { "input_tokens": 58586, "cached_input_tokens": 58240, "cache_write_input_tokens": 0, "output_tokens": 143, "reasoning_output_tokens": 22, "total_tokens": 58729 }, "turn_token_usage": { "input_tokens": 1952885, "cached_input_tokens": 1857024, "cache_write_input_tokens": 0, "output_tokens": 8506, "reasoning_output_tokens": 2662, "total_tokens": 1961391 }, "thread_token_usage": { "input_tokens": 1952885, "cached_input_tokens": 1857024, "cache_write_input_tokens": 0, "output_tokens": 8506, "reasoning_output_tokens": 2662, "total_tokens": 1961391 } } ### exec · 2026-09-23T21:57:53.351Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:58292,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:58:23.371Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"610c8a","wall_time_seconds":30.001276199,"session_id":58292,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44b5e41cc87d2af7e60925d02b296", "usage": { "input_tokens": 58784, "cached_input_tokens": 58368, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 58835 }, "turn_token_usage": { "input_tokens": 2011669, "cached_input_tokens": 1915392, "cache_write_input_tokens": 0, "output_tokens": 8557, "reasoning_output_tokens": 2662, "total_tokens": 2020226 }, "thread_token_usage": { "input_tokens": 2011669, "cached_input_tokens": 1915392, "cache_write_input_tokens": 0, "output_tokens": 8557, "reasoning_output_tokens": 2662, "total_tokens": 2020226 } } ### exec · 2026-09-23T21:58:27.062Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:58292,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:58:57.081Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"b273f6","wall_time_seconds":30.000842149,"session_id":58292,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44b7f956487d2a671343857ed6e9d", "usage": { "input_tokens": 58889, "cached_input_tokens": 58624, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 58940 }, "turn_token_usage": { "input_tokens": 2070558, "cached_input_tokens": 1974016, "cache_write_input_tokens": 0, "output_tokens": 8608, "reasoning_output_tokens": 2662, "total_tokens": 2079166 }, "thread_token_usage": { "input_tokens": 2070558, "cached_input_tokens": 1974016, "cache_write_input_tokens": 0, "output_tokens": 8608, "reasoning_output_tokens": 2662, "total_tokens": 2079166 } } ## Step 42 · agent · 2026-09-23T21:58:58.801Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T21:59:00.167Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:58292,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T21:59:30.181Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"b6b292","wall_time_seconds":30.000974629,"session_id":58292,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44ba15ae087d28764e0332796e209", "usage": { "input_tokens": 58994, "cached_input_tokens": 58752, "cache_write_input_tokens": 0, "output_tokens": 65, "reasoning_output_tokens": 12, "total_tokens": 59059 }, "turn_token_usage": { "input_tokens": 2129552, "cached_input_tokens": 2032768, "cache_write_input_tokens": 0, "output_tokens": 8673, "reasoning_output_tokens": 2674, "total_tokens": 2138225 }, "thread_token_usage": { "input_tokens": 2129552, "cached_input_tokens": 2032768, "cache_write_input_tokens": 0, "output_tokens": 8673, "reasoning_output_tokens": 2674, "total_tokens": 2138225 } } ### exec · 2026-09-23T21:59:32.737Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:58292,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:00:02.750Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"370aed","wall_time_seconds":30.000692736,"session_id":58292,"original_token_count":24} epoch=1/1 batches=250 targets=987,417 batch_bce=0.627672 running_bce=0.617616 elapsed=238.4s ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44bc2633887d2878778a72074fc7e", "usage": { "input_tokens": 59113, "cached_input_tokens": 52096, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 59164 }, "turn_token_usage": { "input_tokens": 2188665, "cached_input_tokens": 2084864, "cache_write_input_tokens": 0, "output_tokens": 8724, "reasoning_output_tokens": 2674, "total_tokens": 2197389 }, "thread_token_usage": { "input_tokens": 2188665, "cached_input_tokens": 2084864, "cache_write_input_tokens": 0, "output_tokens": 8724, "reasoning_output_tokens": 2674, "total_tokens": 2197389 } } ## Step 43 · agent · 2026-09-23T22:00:04.864Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:00:06.240Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:58292,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:00:36.276Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"7db2df","wall_time_seconds":30.001448718,"session_id":58292,"original_token_count":73} saved epoch checkpoint: /app/solution/hard_ckpt/epoch-01.pt epoch=1/1 train_loss=0.61630 validation_loss=0.58925 pair_accuracy=1.227 train_targets=1,052,953 validation_targets=130,103 train_seconds=254.0 validation_seconds=19.5 restored best validation-BCE checkpoint: epoch=1 loss=0.589250 ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44be2ffac87d2b4f40118789e840f", "usage": { "input_tokens": 59252, "cached_input_tokens": 58752, "cache_write_input_tokens": 0, "output_tokens": 59, "reasoning_output_tokens": 6, "total_tokens": 59311 }, "turn_token_usage": { "input_tokens": 2247917, "cached_input_tokens": 2143616, "cache_write_input_tokens": 0, "output_tokens": 8783, "reasoning_output_tokens": 2680, "total_tokens": 2256700 }, "thread_token_usage": { "input_tokens": 2247917, "cached_input_tokens": 2143616, "cache_write_input_tokens": 0, "output_tokens": 8783, "reasoning_output_tokens": 2680, "total_tokens": 2256700 } } ## Step 44 · agent · 2026-09-23T22:00:40.109Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:00:41.491Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:58292,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:01:11.523Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"f8794e","wall_time_seconds":30.000952681,"session_id":58292,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44c04d20c87d2984f9b62b77603e0", "usage": { "input_tokens": 59453, "cached_input_tokens": 58880, "cache_write_input_tokens": 0, "output_tokens": 65, "reasoning_output_tokens": 12, "total_tokens": 59518 }, "turn_token_usage": { "input_tokens": 2307370, "cached_input_tokens": 2202496, "cache_write_input_tokens": 0, "output_tokens": 8848, "reasoning_output_tokens": 2692, "total_tokens": 2316218 }, "thread_token_usage": { "input_tokens": 2307370, "cached_input_tokens": 2202496, "cache_write_input_tokens": 0, "output_tokens": 8848, "reasoning_output_tokens": 2692, "total_tokens": 2316218 } } ### exec · 2026-09-23T22:01:15.709Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:58292,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:01:40.407Z Script completed Wall time 24.7 seconds Output: {"chunk_id":"b1f0f2","wall_time_seconds":24.679913627,"exit_code":0,"original_token_count":809} ranked users=1,024/8,456 ranked users=2,048/8,456 ranked users=3,072/8,456 ranked users=4,096/8,456 ranked users=5,120/8,456 ranked users=6,144/8,456 ranked users=7,168/8,456 ranked users=8,192/8,456 ranked users=8,456/8,456 { "baseline": "yambda-windowed-sequence-two-tower-base", "stage": "validation", "output": "/app/solution/hard_validation.parquet", "rows": 845600, "users": 8456, "runtime_seconds": 361.246, "public_inputs_only": true, "architecture": { "family": "pure-windowed-sequence-two-tower", "sequence_training": "every-adjacent-target-within-recent-chronological-window", "sequence_encoder": "one-layer-GRU-dense-timestep-loss", "bptt_hidden_state": "carried-and-detached", "model_selection": "chronological-validation-BCE-early-stopping", "loss_execution": "gradient-accumulated-microbatches", "user_id_embedding": false, "user_mlp": "582-512-256-192", "item_mlp": "196-512-256-192", "normalization": "none", "score": "raw-dot-product", "objective": "sample-weighted-BCE-at-every-timestep", "negative_sampling": "24-uniform-plus-8-propensity-corrected-inbatch", "false_negative_filter": "full-training-history", "target_weighting": "organic-strong" }, "config": { "bptt_steps": 100, "user_batch_size": 64, "embedding_dim": 192, "hidden_dim": 192, "user_hidden_1": 512, "user_hidden_2": 256, "item_hidden_1": 512, "item_hidden_2": 256, "dropout": 0.05, "epochs": 1, "learning_rate": 0.001, "weight_decay": 1e-05, "gradient_clip": 2.0, "loss_microbatch_size": 65536, "uniform_negatives": 24, "inbatch_negatives": 8, "hard_inbatch_pool": 32, "inbatch_correction_power": 0.5, "inbatch_correction_min": 0.25, "inbatch_correction_max": 4.0, "negative_filter_scope": "full-training-history", "target_weighting": "organic-strong", "ordinary_target_weight": 0.25, "organic_strong_target_weight": 1.0, "organic_like_target_weight": 3.0, "discovery_horizon_days": 7, "validation_fraction": 0.1, "max_train_targets_per_user": 128, "max_validation_targets_per_user": 16, "early_stopping_patience": 1, "early_stopping_min_delta": 0.0001, "seed": 29 }, "sequence_tokens": 20056329, "all_next_item_targets": 20047194, "selected_training_targets": 1052953, "selected_validation_targets": 130103, "discarded_old_targets": 18864138, "training_history": [ { "epoch": 1.0, "loss": 0.6162969187603793, "positive_logit": 0.29876366698645557, "negative_logit": -0.6895776899188711, "pair_accuracy": 1.226760685187278, "targets": 1052953.0, "target_weight_sum": 632551.0, "batches": 266.0, "seconds": 254.02480272499997, "validation_loss": 0.5892495951702332, "validation_targets": 130103.0, "validation_target_weight_sum": 78769.25, "validation_seconds": 19.54024607600013 } ], "embedding_diagnostics": { "query_norm_mean": 1.3014153242111206, "query_norm_std": 0.8014945387840271, "item_norm_mean": 1.9221857786178589, "item_norm_std": 1.158937931060791 }, "torch_version": "2.8.0+cpu", "device": "cpu" } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44c27b8bc87d2b9cdfd306ff61a00", "usage": { "input_tokens": 59572, "cached_input_tokens": 59264, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 59623 }, "turn_token_usage": { "input_tokens": 2366942, "cached_input_tokens": 2261760, "cache_write_input_tokens": 0, "output_tokens": 8899, "reasoning_output_tokens": 2692, "total_tokens": 2375841 }, "thread_token_usage": { "input_tokens": 2366942, "cached_input_tokens": 2261760, "cache_write_input_tokens": 0, "output_tokens": 8899, "reasoning_output_tokens": 2692, "total_tokens": 2375841 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-e9e62f5a-927e-4f86-8bf6-5f9f0e4b8b48", "process_id": "58292", "command": [ "/bin/sh", "-lc", "/opt/task-venv/bin/python /app/solution/train_current_model.py --stage validation --public-dir /task --prepared-cache /app/solution/validation_cache.npz --output /app/solution/hard_validation.parquet --uniform-negatives 24 --inbatch-negatives 8 --hard-inbatch-pool 32 --inbatch-correction-power 0.5 --checkpoint-dir /app/solution/hard_ckpt" ], "cwd": "file:///app/solution", "parsed_cmd": [ { "type": "unknown", "cmd": "/opt/task-venv/bin/python /app/solution/train_current_model.py --stage validation --public-dir /task --prepared-cache /app/solution/validation_cache.npz --output /app/solution/hard_validation.parquet --uniform-negatives 24 --inbatch-negatives 8 --hard-inbatch-pool 32 --inbatch-correction-power 0.5 --checkpoint-dir /app/solution/hard_ckpt" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "loaded full-sequence cache: tokens=20,056,329 targets=20,047,194\nchronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194\ninbatch correction: min=0.250 mean_on_targets=1.001 max=4.000\ntarget weighting=organic-strong min=0.250 mean=0.575 max=1.000\nfull-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250\nepoch=1/1 batches=250 targets=987,417 batch_bce=0.627672 running_bce=0.617616 elapsed=238.4s\nsaved epoch checkpoint: /app/solution/hard_ckpt/epoch-01.pt\nepoch=1/1 train_loss=0.61630 validation_loss=0.58925 pair_accuracy=1.227 train_targets=1,052,953 validation_targets=130,103 train_seconds=254.0 validation_seconds=19.5\nrestored best validation-BCE checkpoint: epoch=1 loss=0.589250\nranked users=1,024/8,456\nranked users=2,048/8,456\nranked users=3,072/8,456\nranked users=4,096/8,456\nranked users=5,120/8,456\nranked users=6,144/8,456\nranked users=7,168/8,456\nranked users=8,192/8,456\nranked users=8,456/8,456\n{\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": \"validation\",\n \"output\": \"/app/solution/hard_validation.parquet\",\n \"rows\": 845600,\n \"users\": 8456,\n \"runtime_seconds\": 361.246,\n \"public_inputs_only\": true,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": \"every-adjacent-target-within-recent-chronological-window\",\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": false,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": \"24-uniform-plus-8-propensity-corrected-inbatch\",\n \"false_negative_filter\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\"\n },\n \"config\": {\n \"bptt_steps\": 100,\n \"user_batch_size\": 64,\n \"embedding_dim\": 192,\n \"hidden_dim\": 192,\n \"user_hidden_1\": 512,\n \"user_hidden_2\": 256,\n \"item_hidden_1\": 512,\n \"item_hidden_2\": 256,\n \"dropout\": 0.05,\n \"epochs\": 1,\n \"learning_rate\": 0.001,\n \"weight_decay\": 1e-05,\n \"gradient_clip\": 2.0,\n \"loss_microbatch_size\": 65536,\n \"uniform_negatives\": 24,\n \"inbatch_negatives\": 8,\n \"hard_inbatch_pool\": 32,\n \"inbatch_correction_power\": 0.5,\n \"inbatch_correction_min\": 0.25,\n \"inbatch_correction_max\": 4.0,\n \"negative_filter_scope\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\",\n \"ordinary_target_weight\": 0.25,\n \"organic_strong_target_weight\": 1.0,\n \"organic_like_target_weight\": 3.0,\n \"discovery_horizon_days\": 7,\n \"validation_fraction\": 0.1,\n \"max_train_targets_per_user\": 128,\n \"max_validation_targets_per_user\": 16,\n \"early_stopping_patience\": 1,\n \"early_stopping_min_delta\": 0.0001,\n \"seed\": 29\n },\n \"sequence_tokens\": 20056329,\n \"all_next_item_targets\": 20047194,\n \"selected_training_targets\": 1052953,\n \"selected_validation_targets\": 130103,\n \"discarded_old_targets\": 18864138,\n \"training_history\": [\n {\n \"epoch\": 1.0,\n \"loss\": 0.6162969187603793,\n \"positive_logit\": 0.29876366698645557,\n \"negative_logit\": -0.6895776899188711,\n \"pair_accuracy\": 1.226760685187278,\n \"targets\": 1052953.0,\n \"target_weight_sum\": 632551.0,\n \"batches\": 266.0,\n \"seconds\": 254.02480272499997,\n \"validation_loss\": 0.5892495951702332,\n \"validation_targets\": 130103.0,\n \"validation_target_weight_sum\": 78769.25,\n \"validation_seconds\": 19.54024607600013\n }\n ],\n \"embedding_diagnostics\": {\n \"query_norm_mean\": 1.3014153242111206,\n \"query_norm_std\": 0.8014945387840271,\n \"item_norm_mean\": 1.9221857786178589,\n \"item_norm_std\": 1.158937931060791\n },\n \"torch_version\": \"2.8.0+cpu\",\n \"device\": \"cpu\"\n}\n", "stderr": "", "aggregated_output": "loaded full-sequence cache: tokens=20,056,329 targets=20,047,194\nchronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194\ninbatch correction: min=0.250 mean_on_targets=1.001 max=4.000\ntarget weighting=organic-strong min=0.250 mean=0.575 max=1.000\nfull-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250\nepoch=1/1 batches=250 targets=987,417 batch_bce=0.627672 running_bce=0.617616 elapsed=238.4s\nsaved epoch checkpoint: /app/solution/hard_ckpt/epoch-01.pt\nepoch=1/1 train_loss=0.61630 validation_loss=0.58925 pair_accuracy=1.227 train_targets=1,052,953 validation_targets=130,103 train_seconds=254.0 validation_seconds=19.5\nrestored best validation-BCE checkpoint: epoch=1 loss=0.589250\nranked users=1,024/8,456\nranked users=2,048/8,456\nranked users=3,072/8,456\nranked users=4,096/8,456\nranked users=5,120/8,456\nranked users=6,144/8,456\nranked users=7,168/8,456\nranked users=8,192/8,456\nranked users=8,456/8,456\n{\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": \"validation\",\n \"output\": \"/app/solution/hard_validation.parquet\",\n \"rows\": 845600,\n \"users\": 8456,\n \"runtime_seconds\": 361.246,\n \"public_inputs_only\": true,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": \"every-adjacent-target-within-recent-chronological-window\",\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": false,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": \"24-uniform-plus-8-propensity-corrected-inbatch\",\n \"false_negative_filter\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\"\n },\n \"config\": {\n \"bptt_steps\": 100,\n \"user_batch_size\": 64,\n \"embedding_dim\": 192,\n \"hidden_dim\": 192,\n \"user_hidden_1\": 512,\n \"user_hidden_2\": 256,\n \"item_hidden_1\": 512,\n \"item_hidden_2\": 256,\n \"dropout\": 0.05,\n \"epochs\": 1,\n \"learning_rate\": 0.001,\n \"weight_decay\": 1e-05,\n \"gradient_clip\": 2.0,\n \"loss_microbatch_size\": 65536,\n \"uniform_negatives\": 24,\n \"inbatch_negatives\": 8,\n \"hard_inbatch_pool\": 32,\n \"inbatch_correction_power\": 0.5,\n \"inbatch_correction_min\": 0.25,\n \"inbatch_correction_max\": 4.0,\n \"negative_filter_scope\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\",\n \"ordinary_target_weight\": 0.25,\n \"organic_strong_target_weight\": 1.0,\n \"organic_like_target_weight\": 3.0,\n \"discovery_horizon_days\": 7,\n \"validation_fraction\": 0.1,\n \"max_train_targets_per_user\": 128,\n \"max_validation_targets_per_user\": 16,\n \"early_stopping_patience\": 1,\n \"early_stopping_min_delta\": 0.0001,\n \"seed\": 29\n },\n \"sequence_tokens\": 20056329,\n \"all_next_item_targets\": 20047194,\n \"selected_training_targets\": 1052953,\n \"selected_validation_targets\": 130103,\n \"discarded_old_targets\": 18864138,\n \"training_history\": [\n {\n \"epoch\": 1.0,\n \"loss\": 0.6162969187603793,\n \"positive_logit\": 0.29876366698645557,\n \"negative_logit\": -0.6895776899188711,\n \"pair_accuracy\": 1.226760685187278,\n \"targets\": 1052953.0,\n \"target_weight_sum\": 632551.0,\n \"batches\": 266.0,\n \"seconds\": 254.02480272499997,\n \"validation_loss\": 0.5892495951702332,\n \"validation_targets\": 130103.0,\n \"validation_target_weight_sum\": 78769.25,\n \"validation_seconds\": 19.54024607600013\n }\n ],\n \"embedding_diagnostics\": {\n \"query_norm_mean\": 1.3014153242111206,\n \"query_norm_std\": 0.8014945387840271,\n \"item_norm_mean\": 1.9221857786178589,\n \"item_norm_std\": 1.158937931060791\n },\n \"torch_version\": \"2.8.0+cpu\",\n \"device\": \"cpu\"\n}\n", "exit_code": 0, "duration": { "secs": 365, "nanos": 690239949 }, "formatted_output": "loaded full-sequence cache: tokens=20,056,329 targets=20,047,194\nchronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194\ninbatch correction: min=0.250 mean_on_targets=1.001 max=4.000\ntarget weighting=organic-strong min=0.250 mean=0.575 max=1.000\nfull-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250\nepoch=1/1 batches=250 targets=987,417 batch_bce=0.627672 running_bce=0.617616 elapsed=238.4s\nsaved epoch checkpoint: /app/solution/hard_ckpt/epoch-01.pt\nepoch=1/1 train_loss=0.61630 validation_loss=0.58925 pair_accuracy=1.227 train_targets=1,052,953 validation_targets=130,103 train_seconds=254.0 validation_seconds=19.5\nrestored best validation-BCE checkpoint: epoch=1 loss=0.589250\nranked users=1,024/8,456\nranked users=2,048/8,456\nranked users=3,072/8,456\nranked users=4,096/8,456\nranked users=5,120/8,456\nranked users=6,144/8,456\nranked users=7,168/8,456\nranked users=8,192/8,456\nranked users=8,456/8,456\n{\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": \"validation\",\n \"output\": \"/app/solution/hard_validation.parquet\",\n \"rows\": 845600,\n \"users\": 8456,\n \"runtime_seconds\": 361.246,\n \"public_inputs_only\": true,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": \"every-adjacent-target-within-recent-chronological-window\",\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": false,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": \"24-uniform-plus-8-propensity-corrected-inbatch\",\n \"false_negative_filter\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\"\n },\n \"config\": {\n \"bptt_steps\": 100,\n \"user_batch_size\": 64,\n \"embedding_dim\": 192,\n \"hidden_dim\": 192,\n \"user_hidden_1\": 512,\n \"user_hidden_2\": 256,\n \"item_hidden_1\": 512,\n \"item_hidden_2\": 256,\n \"dropout\": 0.05,\n \"epochs\": 1,\n \"learning_rate\": 0.001,\n \"weight_decay\": 1e-05,\n \"gradient_clip\": 2.0,\n \"loss_microbatch_size\": 65536,\n \"uniform_negatives\": 24,\n \"inbatch_negatives\": 8,\n \"hard_inbatch_pool\": 32,\n \"inbatch_correction_power\": 0.5,\n \"inbatch_correction_min\": 0.25,\n \"inbatch_correction_max\": 4.0,\n \"negative_filter_scope\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\",\n \"ordinary_target_weight\": 0.25,\n \"organic_strong_target_weight\": 1.0,\n \"organic_like_target_weight\": 3.0,\n \"discovery_horizon_days\": 7,\n \"validation_fraction\": 0.1,\n \"max_train_targets_per_user\": 128,\n \"max_validation_targets_per_user\": 16,\n \"early_stopping_patience\": 1,\n \"early_stopping_min_delta\": 0.0001,\n \"seed\": 29\n },\n \"sequence_tokens\": 20056329,\n \"all_next_item_targets\": 20047194,\n \"selected_training_targets\": 1052953,\n \"selected_validation_targets\": 130103,\n \"discarded_old_targets\": 18864138,\n \"training_history\": [\n {\n \"epoch\": 1.0,\n \"loss\": 0.6162969187603793,\n \"positive_logit\": 0.29876366698645557,\n \"negative_logit\": -0.6895776899188711,\n \"pair_accuracy\": 1.226760685187278,\n \"targets\": 1052953.0,\n \"target_weight_sum\": 632551.0,\n \"batches\": 266.0,\n \"seconds\": 254.02480272499997,\n \"validation_loss\": 0.5892495951702332,\n \"validation_targets\": 130103.0,\n \"validation_target_weight_sum\": 78769.25,\n \"validation_seconds\": 19.54024607600013\n }\n ],\n \"embedding_diagnostics\": {\n \"query_norm_mean\": 1.3014153242111206,\n \"query_norm_std\": 0.8014945387840271,\n \"item_norm_mean\": 1.9221857786178589,\n \"item_norm_std\": 1.158937931060791\n },\n \"torch_version\": \"2.8.0+cpu\",\n \"device\": \"cpu\"\n}\n" } } ### exec · 2026-09-23T22:01:49.688Z { "code": "const r = await tools.exec_command({cmd:\"/opt/task-venv/bin/python /task/evaluate_public.py /app/solution/hard_validation.parquet\",\"workdir\":\"/app\",\"yield_time_ms\":30000,\"max_output_tokens\":3000}); text(r.output)\n" } ### Tool output · 2026-09-23T22:01:53.244Z Script completed Wall time 3.6 seconds Output: { "model": "/app/solution/hard_validation.parquet", "scores": { "quality_ndcg@10": 0.017228, "quality_users": 4263 } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44c44a7b087d2b21f65cbb9e81a2f", "usage": { "input_tokens": 60747, "cached_input_tokens": 59392, "cache_write_input_tokens": 0, "output_tokens": 68, "reasoning_output_tokens": 0, "total_tokens": 60815 }, "turn_token_usage": { "input_tokens": 2427689, "cached_input_tokens": 2321152, "cache_write_input_tokens": 0, "output_tokens": 8967, "reasoning_output_tokens": 2692, "total_tokens": 2436656 }, "thread_token_usage": { "input_tokens": 2427689, "cached_input_tokens": 2321152, "cache_write_input_tokens": 0, "output_tokens": 8967, "reasoning_output_tokens": 2692, "total_tokens": 2436656 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-a1a2f874-e411-45d9-8503-7d215dc5bdb8", "process_id": "7607", "command": [ "/bin/sh", "-lc", "/opt/task-venv/bin/python /task/evaluate_public.py /app/solution/hard_validation.parquet" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "/opt/task-venv/bin/python /task/evaluate_public.py /app/solution/hard_validation.parquet" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "{\n \"model\": \"/app/solution/hard_validation.parquet\",\n \"scores\": {\n \"quality_ndcg@10\": 0.017228,\n \"quality_users\": 4263\n }\n}\n", "stderr": "", "aggregated_output": "{\n \"model\": \"/app/solution/hard_validation.parquet\",\n \"scores\": {\n \"quality_ndcg@10\": 0.017228,\n \"quality_users\": 4263\n }\n}\n", "exit_code": 0, "duration": { "secs": 3, "nanos": 388441239 }, "formatted_output": "{\n \"model\": \"/app/solution/hard_validation.parquet\",\n \"scores\": {\n \"quality_ndcg@10\": 0.017228,\n \"quality_users\": 4263\n }\n}\n" } } ## Step 45 · agent · 2026-09-23T22:01:56.434Z ### Thinking unavailable — no text recorded Semi-hard mining improved over uncorrected all-in-batch (0.01723 vs. 0.01309) but remains below production, so aggressive score-based hardness is not the right tradeoff here. The next ablation removes in-batch negatives entirely while keeping 32 total negatives; this tests whether the baseline’s supposedly “harder” negatives are actually injecting popularity-biased false pressure. ### exec · 2026-09-23T22:02:02.985Z { "code": "const r = await tools.exec_command({cmd:\"/opt/task-venv/bin/python /app/solution/train_current_model.py --stage validation --public-dir /task --prepared-cache /app/solution/validation_cache.npz --output /app/solution/uniform_validation.parquet --uniform-negatives 32 --inbatch-negatives 0 --checkpoint-dir /app/solution/uniform_ckpt\",\"workdir\":\"/app/solution\",\"yield_time_ms\":1000,\"max_output_tokens\":8000}); text(JSON.stringify(r))\n" } ### Tool output · 2026-09-23T22:02:04.151Z Script completed Wall time 1.2 seconds Output: {"chunk_id":"80e984","wall_time_seconds":1.000791351,"session_id":65973,"original_token_count":0,"output":""} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44c51799487d2b0623812497fbe6e", "usage": { "input_tokens": 60884, "cached_input_tokens": 59136, "cache_write_input_tokens": 0, "output_tokens": 252, "reasoning_output_tokens": 43, "total_tokens": 61136 }, "turn_token_usage": { "input_tokens": 2488573, "cached_input_tokens": 2380288, "cache_write_input_tokens": 0, "output_tokens": 9219, "reasoning_output_tokens": 2735, "total_tokens": 2497792 }, "thread_token_usage": { "input_tokens": 2488573, "cached_input_tokens": 2380288, "cache_write_input_tokens": 0, "output_tokens": 9219, "reasoning_output_tokens": 2735, "total_tokens": 2497792 } } ## Step 46 · agent · 2026-09-23T22:02:30.432Z ### Thinking unavailable — no text recorded ## Step 47 · agent · 2026-09-23T22:02:35.208Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:02:35.656Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:65973,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:03:05.672Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"f2b025","wall_time_seconds":30.000737017,"session_id":65973,"original_token_count":103} loaded full-sequence cache: tokens=20,056,329 targets=20,047,194 chronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194 inbatch correction: min=0.250 mean_on_targets=1.001 max=4.000 target weighting=organic-strong min=0.250 mean=0.575 max=1.000 full-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250 ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44c5c5bf487d2bd0d1b56358a6dd0", "usage": { "input_tokens": 61193, "cached_input_tokens": 61056, "cache_write_input_tokens": 0, "output_tokens": 742, "reasoning_output_tokens": 689, "total_tokens": 61935 }, "turn_token_usage": { "input_tokens": 2549766, "cached_input_tokens": 2441344, "cache_write_input_tokens": 0, "output_tokens": 9961, "reasoning_output_tokens": 3424, "total_tokens": 2559727 }, "thread_token_usage": { "input_tokens": 2549766, "cached_input_tokens": 2441344, "cache_write_input_tokens": 0, "output_tokens": 9961, "reasoning_output_tokens": 3424, "total_tokens": 2559727 } } ### exec · 2026-09-23T22:03:10.018Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:65973,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:03:40.037Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"377227","wall_time_seconds":30.001830418,"session_id":65973,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44c99eef887d2b0ffbad4731c2c97", "usage": { "input_tokens": 62123, "cached_input_tokens": 60544, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 62174 }, "turn_token_usage": { "input_tokens": 2611889, "cached_input_tokens": 2501888, "cache_write_input_tokens": 0, "output_tokens": 10012, "reasoning_output_tokens": 3424, "total_tokens": 2621901 }, "thread_token_usage": { "input_tokens": 2611889, "cached_input_tokens": 2501888, "cache_write_input_tokens": 0, "output_tokens": 10012, "reasoning_output_tokens": 3424, "total_tokens": 2621901 } } ### exec · 2026-09-23T22:03:42.782Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:65973,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:04:12.797Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"83c7b0","wall_time_seconds":30.000936577,"session_id":65973,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44cbc519c87d2b33e07d5f7efdafd", "usage": { "input_tokens": 62226, "cached_input_tokens": 61952, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 62277 }, "turn_token_usage": { "input_tokens": 2674115, "cached_input_tokens": 2563840, "cache_write_input_tokens": 0, "output_tokens": 10063, "reasoning_output_tokens": 3424, "total_tokens": 2684178 }, "thread_token_usage": { "input_tokens": 2674115, "cached_input_tokens": 2563840, "cache_write_input_tokens": 0, "output_tokens": 10063, "reasoning_output_tokens": 3424, "total_tokens": 2684178 } } ### exec · 2026-09-23T22:04:15.598Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:65973,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:04:45.614Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"4e8d21","wall_time_seconds":30.000709837,"session_id":65973,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44cdd016c87d281c61a10a4d92381", "usage": { "input_tokens": 62332, "cached_input_tokens": 62080, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 62383 }, "turn_token_usage": { "input_tokens": 2736447, "cached_input_tokens": 2625920, "cache_write_input_tokens": 0, "output_tokens": 10114, "reasoning_output_tokens": 3424, "total_tokens": 2746561 }, "thread_token_usage": { "input_tokens": 2736447, "cached_input_tokens": 2625920, "cache_write_input_tokens": 0, "output_tokens": 10114, "reasoning_output_tokens": 3424, "total_tokens": 2746561 } } ### exec · 2026-09-23T22:04:48.546Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:65973,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:05:18.608Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"d47f8f","wall_time_seconds":30.001814141,"session_id":65973,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44cfdf37087d2b12c11a63e77a1c2", "usage": { "input_tokens": 62438, "cached_input_tokens": 62208, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 62489 }, "turn_token_usage": { "input_tokens": 2798885, "cached_input_tokens": 2688128, "cache_write_input_tokens": 0, "output_tokens": 10165, "reasoning_output_tokens": 3424, "total_tokens": 2809050 }, "thread_token_usage": { "input_tokens": 2798885, "cached_input_tokens": 2688128, "cache_write_input_tokens": 0, "output_tokens": 10165, "reasoning_output_tokens": 3424, "total_tokens": 2809050 } } ## Step 48 · agent · 2026-09-23T22:05:21.749Z ### Thinking unavailable — no text recorded So far, hardness correlates poorly with the actual graded top-10 metric even when sampled BCE looks reasonable—a reminder that sampler validation loss is not comparable across sampling distributions. The all-uniform run will establish whether lower-variance catalog coverage is a safer improvement; after that I’ll test explicit objective alignment only on the best sampler to conserve CPU time. ### exec · 2026-09-23T22:06:00.521Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:65973,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:06:30.566Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"bcca78","wall_time_seconds":30.001010069,"session_id":65973,"original_token_count":97} epoch=1/1 batches=250 targets=987,417 batch_bce=0.535239 running_bce=0.524238 elapsed=188.7s saved epoch checkpoint: /app/solution/uniform_ckpt/epoch-01.pt epoch=1/1 train_loss=0.52256 validation_loss=0.47645 pair_accuracy=0.793 train_targets=1,052,953 validation_targets=130,103 train_seconds=201.0 validation_seconds=16.4 restored best validation-BCE checkpoint: epoch=1 loss=0.476447 ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44d1ecd9c87d294500eae214799ef", "usage": { "input_tokens": 62544, "cached_input_tokens": 62336, "cache_write_input_tokens": 0, "output_tokens": 138, "reasoning_output_tokens": 8, "total_tokens": 62682 }, "turn_token_usage": { "input_tokens": 2861429, "cached_input_tokens": 2750464, "cache_write_input_tokens": 0, "output_tokens": 10303, "reasoning_output_tokens": 3432, "total_tokens": 2871732 }, "thread_token_usage": { "input_tokens": 2861429, "cached_input_tokens": 2750464, "cache_write_input_tokens": 0, "output_tokens": 10303, "reasoning_output_tokens": 3432, "total_tokens": 2871732 } } ## Step 49 · agent · 2026-09-23T22:06:32.233Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:06:33.596Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:65973,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:07:03.625Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"b4110b","wall_time_seconds":30.001472419,"session_id":65973,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44d66d12c87d2845104a846760e8a", "usage": { "input_tokens": 62859, "cached_input_tokens": 62464, "cache_write_input_tokens": 0, "output_tokens": 63, "reasoning_output_tokens": 10, "total_tokens": 62922 }, "turn_token_usage": { "input_tokens": 2924288, "cached_input_tokens": 2812928, "cache_write_input_tokens": 0, "output_tokens": 10366, "reasoning_output_tokens": 3442, "total_tokens": 2934654 }, "thread_token_usage": { "input_tokens": 2924288, "cached_input_tokens": 2812928, "cache_write_input_tokens": 0, "output_tokens": 10366, "reasoning_output_tokens": 3442, "total_tokens": 2934654 } } ### exec · 2026-09-23T22:07:12.097Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:65973,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:07:15.736Z Script completed Wall time 3.6 seconds Output: {"chunk_id":"543ced","wall_time_seconds":3.574764911,"exit_code":0,"original_token_count":810} ranked users=1,024/8,456 ranked users=2,048/8,456 ranked users=3,072/8,456 ranked users=4,096/8,456 ranked users=5,120/8,456 ranked users=6,144/8,456 ranked users=7,168/8,456 ranked users=8,192/8,456 ranked users=8,456/8,456 { "baseline": "yambda-windowed-sequence-two-tower-base", "stage": "validation", "output": "/app/solution/uniform_validation.parquet", "rows": 845600, "users": 8456, "runtime_seconds": 307.939, "public_inputs_only": true, "architecture": { "family": "pure-windowed-sequence-two-tower", "sequence_training": "every-adjacent-target-within-recent-chronological-window", "sequence_encoder": "one-layer-GRU-dense-timestep-loss", "bptt_hidden_state": "carried-and-detached", "model_selection": "chronological-validation-BCE-early-stopping", "loss_execution": "gradient-accumulated-microbatches", "user_id_embedding": false, "user_mlp": "582-512-256-192", "item_mlp": "196-512-256-192", "normalization": "none", "score": "raw-dot-product", "objective": "sample-weighted-BCE-at-every-timestep", "negative_sampling": "24-uniform-plus-8-propensity-corrected-inbatch", "false_negative_filter": "full-training-history", "target_weighting": "organic-strong" }, "config": { "bptt_steps": 100, "user_batch_size": 64, "embedding_dim": 192, "hidden_dim": 192, "user_hidden_1": 512, "user_hidden_2": 256, "item_hidden_1": 512, "item_hidden_2": 256, "dropout": 0.05, "epochs": 1, "learning_rate": 0.001, "weight_decay": 1e-05, "gradient_clip": 2.0, "loss_microbatch_size": 65536, "uniform_negatives": 32, "inbatch_negatives": 0, "hard_inbatch_pool": 0, "inbatch_correction_power": 0.5, "inbatch_correction_min": 0.25, "inbatch_correction_max": 4.0, "negative_filter_scope": "full-training-history", "target_weighting": "organic-strong", "ordinary_target_weight": 0.25, "organic_strong_target_weight": 1.0, "organic_like_target_weight": 3.0, "discovery_horizon_days": 7, "validation_fraction": 0.1, "max_train_targets_per_user": 128, "max_validation_targets_per_user": 16, "early_stopping_patience": 1, "early_stopping_min_delta": 0.0001, "seed": 29 }, "sequence_tokens": 20056329, "all_next_item_targets": 20047194, "selected_training_targets": 1052953, "selected_validation_targets": 130103, "discarded_old_targets": 18864138, "training_history": [ { "epoch": 1.0, "loss": 0.5225590736606819, "positive_logit": 0.8863575044622087, "negative_logit": -0.7952952123983079, "pair_accuracy": 0.7933858693123055, "targets": 1052953.0, "target_weight_sum": 632551.0, "batches": 266.0, "seconds": 200.95214525499978, "validation_loss": 0.47644699459287015, "validation_targets": 130103.0, "validation_target_weight_sum": 78769.25, "validation_seconds": 16.441554377999637 } ], "embedding_diagnostics": { "query_norm_mean": 1.4792938232421875, "query_norm_std": 0.6746419668197632, "item_norm_mean": 1.789298176765442, "item_norm_std": 0.8772290945053101 }, "torch_version": "2.8.0+cpu", "device": "cpu" } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44d87ea1487d28e8af27e4eaa3257", "usage": { "input_tokens": 62976, "cached_input_tokens": 62720, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 63027 }, "turn_token_usage": { "input_tokens": 2987264, "cached_input_tokens": 2875648, "cache_write_input_tokens": 0, "output_tokens": 10417, "reasoning_output_tokens": 3442, "total_tokens": 2997681 }, "thread_token_usage": { "input_tokens": 2987264, "cached_input_tokens": 2875648, "cache_write_input_tokens": 0, "output_tokens": 10417, "reasoning_output_tokens": 3442, "total_tokens": 2997681 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-b0393440-14da-476f-b8ad-b75660b9eecd", "process_id": "65973", "command": [ "/bin/sh", "-lc", "/opt/task-venv/bin/python /app/solution/train_current_model.py --stage validation --public-dir /task --prepared-cache /app/solution/validation_cache.npz --output /app/solution/uniform_validation.parquet --uniform-negatives 32 --inbatch-negatives 0 --checkpoint-dir /app/solution/uniform_ckpt" ], "cwd": "file:///app/solution", "parsed_cmd": [ { "type": "unknown", "cmd": "/opt/task-venv/bin/python /app/solution/train_current_model.py --stage validation --public-dir /task --prepared-cache /app/solution/validation_cache.npz --output /app/solution/uniform_validation.parquet --uniform-negatives 32 --inbatch-negatives 0 --checkpoint-dir /app/solution/uniform_ckpt" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "loaded full-sequence cache: tokens=20,056,329 targets=20,047,194\nchronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194\ninbatch correction: min=0.250 mean_on_targets=1.001 max=4.000\ntarget weighting=organic-strong min=0.250 mean=0.575 max=1.000\nfull-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250\nepoch=1/1 batches=250 targets=987,417 batch_bce=0.535239 running_bce=0.524238 elapsed=188.7s\nsaved epoch checkpoint: /app/solution/uniform_ckpt/epoch-01.pt\nepoch=1/1 train_loss=0.52256 validation_loss=0.47645 pair_accuracy=0.793 train_targets=1,052,953 validation_targets=130,103 train_seconds=201.0 validation_seconds=16.4\nrestored best validation-BCE checkpoint: epoch=1 loss=0.476447\nranked users=1,024/8,456\nranked users=2,048/8,456\nranked users=3,072/8,456\nranked users=4,096/8,456\nranked users=5,120/8,456\nranked users=6,144/8,456\nranked users=7,168/8,456\nranked users=8,192/8,456\nranked users=8,456/8,456\n{\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": \"validation\",\n \"output\": \"/app/solution/uniform_validation.parquet\",\n \"rows\": 845600,\n \"users\": 8456,\n \"runtime_seconds\": 307.939,\n \"public_inputs_only\": true,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": \"every-adjacent-target-within-recent-chronological-window\",\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": false,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": \"24-uniform-plus-8-propensity-corrected-inbatch\",\n \"false_negative_filter\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\"\n },\n \"config\": {\n \"bptt_steps\": 100,\n \"user_batch_size\": 64,\n \"embedding_dim\": 192,\n \"hidden_dim\": 192,\n \"user_hidden_1\": 512,\n \"user_hidden_2\": 256,\n \"item_hidden_1\": 512,\n \"item_hidden_2\": 256,\n \"dropout\": 0.05,\n \"epochs\": 1,\n \"learning_rate\": 0.001,\n \"weight_decay\": 1e-05,\n \"gradient_clip\": 2.0,\n \"loss_microbatch_size\": 65536,\n \"uniform_negatives\": 32,\n \"inbatch_negatives\": 0,\n \"hard_inbatch_pool\": 0,\n \"inbatch_correction_power\": 0.5,\n \"inbatch_correction_min\": 0.25,\n \"inbatch_correction_max\": 4.0,\n \"negative_filter_scope\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\",\n \"ordinary_target_weight\": 0.25,\n \"organic_strong_target_weight\": 1.0,\n \"organic_like_target_weight\": 3.0,\n \"discovery_horizon_days\": 7,\n \"validation_fraction\": 0.1,\n \"max_train_targets_per_user\": 128,\n \"max_validation_targets_per_user\": 16,\n \"early_stopping_patience\": 1,\n \"early_stopping_min_delta\": 0.0001,\n \"seed\": 29\n },\n \"sequence_tokens\": 20056329,\n \"all_next_item_targets\": 20047194,\n \"selected_training_targets\": 1052953,\n \"selected_validation_targets\": 130103,\n \"discarded_old_targets\": 18864138,\n \"training_history\": [\n {\n \"epoch\": 1.0,\n \"loss\": 0.5225590736606819,\n \"positive_logit\": 0.8863575044622087,\n \"negative_logit\": -0.7952952123983079,\n \"pair_accuracy\": 0.7933858693123055,\n \"targets\": 1052953.0,\n \"target_weight_sum\": 632551.0,\n \"batches\": 266.0,\n \"seconds\": 200.95214525499978,\n \"validation_loss\": 0.47644699459287015,\n \"validation_targets\": 130103.0,\n \"validation_target_weight_sum\": 78769.25,\n \"validation_seconds\": 16.441554377999637\n }\n ],\n \"embedding_diagnostics\": {\n \"query_norm_mean\": 1.4792938232421875,\n \"query_norm_std\": 0.6746419668197632,\n \"item_norm_mean\": 1.789298176765442,\n \"item_norm_std\": 0.8772290945053101\n },\n \"torch_version\": \"2.8.0+cpu\",\n \"device\": \"cpu\"\n}\n", "stderr": "", "aggregated_output": "loaded full-sequence cache: tokens=20,056,329 targets=20,047,194\nchronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194\ninbatch correction: min=0.250 mean_on_targets=1.001 max=4.000\ntarget weighting=organic-strong min=0.250 mean=0.575 max=1.000\nfull-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250\nepoch=1/1 batches=250 targets=987,417 batch_bce=0.535239 running_bce=0.524238 elapsed=188.7s\nsaved epoch checkpoint: /app/solution/uniform_ckpt/epoch-01.pt\nepoch=1/1 train_loss=0.52256 validation_loss=0.47645 pair_accuracy=0.793 train_targets=1,052,953 validation_targets=130,103 train_seconds=201.0 validation_seconds=16.4\nrestored best validation-BCE checkpoint: epoch=1 loss=0.476447\nranked users=1,024/8,456\nranked users=2,048/8,456\nranked users=3,072/8,456\nranked users=4,096/8,456\nranked users=5,120/8,456\nranked users=6,144/8,456\nranked users=7,168/8,456\nranked users=8,192/8,456\nranked users=8,456/8,456\n{\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": \"validation\",\n \"output\": \"/app/solution/uniform_validation.parquet\",\n \"rows\": 845600,\n \"users\": 8456,\n \"runtime_seconds\": 307.939,\n \"public_inputs_only\": true,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": \"every-adjacent-target-within-recent-chronological-window\",\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": false,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": \"24-uniform-plus-8-propensity-corrected-inbatch\",\n \"false_negative_filter\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\"\n },\n \"config\": {\n \"bptt_steps\": 100,\n \"user_batch_size\": 64,\n \"embedding_dim\": 192,\n \"hidden_dim\": 192,\n \"user_hidden_1\": 512,\n \"user_hidden_2\": 256,\n \"item_hidden_1\": 512,\n \"item_hidden_2\": 256,\n \"dropout\": 0.05,\n \"epochs\": 1,\n \"learning_rate\": 0.001,\n \"weight_decay\": 1e-05,\n \"gradient_clip\": 2.0,\n \"loss_microbatch_size\": 65536,\n \"uniform_negatives\": 32,\n \"inbatch_negatives\": 0,\n \"hard_inbatch_pool\": 0,\n \"inbatch_correction_power\": 0.5,\n \"inbatch_correction_min\": 0.25,\n \"inbatch_correction_max\": 4.0,\n \"negative_filter_scope\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\",\n \"ordinary_target_weight\": 0.25,\n \"organic_strong_target_weight\": 1.0,\n \"organic_like_target_weight\": 3.0,\n \"discovery_horizon_days\": 7,\n \"validation_fraction\": 0.1,\n \"max_train_targets_per_user\": 128,\n \"max_validation_targets_per_user\": 16,\n \"early_stopping_patience\": 1,\n \"early_stopping_min_delta\": 0.0001,\n \"seed\": 29\n },\n \"sequence_tokens\": 20056329,\n \"all_next_item_targets\": 20047194,\n \"selected_training_targets\": 1052953,\n \"selected_validation_targets\": 130103,\n \"discarded_old_targets\": 18864138,\n \"training_history\": [\n {\n \"epoch\": 1.0,\n \"loss\": 0.5225590736606819,\n \"positive_logit\": 0.8863575044622087,\n \"negative_logit\": -0.7952952123983079,\n \"pair_accuracy\": 0.7933858693123055,\n \"targets\": 1052953.0,\n \"target_weight_sum\": 632551.0,\n \"batches\": 266.0,\n \"seconds\": 200.95214525499978,\n \"validation_loss\": 0.47644699459287015,\n \"validation_targets\": 130103.0,\n \"validation_target_weight_sum\": 78769.25,\n \"validation_seconds\": 16.441554377999637\n }\n ],\n \"embedding_diagnostics\": {\n \"query_norm_mean\": 1.4792938232421875,\n \"query_norm_std\": 0.6746419668197632,\n \"item_norm_mean\": 1.789298176765442,\n \"item_norm_std\": 0.8772290945053101\n },\n \"torch_version\": \"2.8.0+cpu\",\n \"device\": \"cpu\"\n}\n", "exit_code": 0, "duration": { "secs": 312, "nanos": 581031565 }, "formatted_output": "loaded full-sequence cache: tokens=20,056,329 targets=20,047,194\nchronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194\ninbatch correction: min=0.250 mean_on_targets=1.001 max=4.000\ntarget weighting=organic-strong min=0.250 mean=0.575 max=1.000\nfull-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250\nepoch=1/1 batches=250 targets=987,417 batch_bce=0.535239 running_bce=0.524238 elapsed=188.7s\nsaved epoch checkpoint: /app/solution/uniform_ckpt/epoch-01.pt\nepoch=1/1 train_loss=0.52256 validation_loss=0.47645 pair_accuracy=0.793 train_targets=1,052,953 validation_targets=130,103 train_seconds=201.0 validation_seconds=16.4\nrestored best validation-BCE checkpoint: epoch=1 loss=0.476447\nranked users=1,024/8,456\nranked users=2,048/8,456\nranked users=3,072/8,456\nranked users=4,096/8,456\nranked users=5,120/8,456\nranked users=6,144/8,456\nranked users=7,168/8,456\nranked users=8,192/8,456\nranked users=8,456/8,456\n{\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": \"validation\",\n \"output\": \"/app/solution/uniform_validation.parquet\",\n \"rows\": 845600,\n \"users\": 8456,\n \"runtime_seconds\": 307.939,\n \"public_inputs_only\": true,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": \"every-adjacent-target-within-recent-chronological-window\",\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": false,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": \"24-uniform-plus-8-propensity-corrected-inbatch\",\n \"false_negative_filter\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\"\n },\n \"config\": {\n \"bptt_steps\": 100,\n \"user_batch_size\": 64,\n \"embedding_dim\": 192,\n \"hidden_dim\": 192,\n \"user_hidden_1\": 512,\n \"user_hidden_2\": 256,\n \"item_hidden_1\": 512,\n \"item_hidden_2\": 256,\n \"dropout\": 0.05,\n \"epochs\": 1,\n \"learning_rate\": 0.001,\n \"weight_decay\": 1e-05,\n \"gradient_clip\": 2.0,\n \"loss_microbatch_size\": 65536,\n \"uniform_negatives\": 32,\n \"inbatch_negatives\": 0,\n \"hard_inbatch_pool\": 0,\n \"inbatch_correction_power\": 0.5,\n \"inbatch_correction_min\": 0.25,\n \"inbatch_correction_max\": 4.0,\n \"negative_filter_scope\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\",\n \"ordinary_target_weight\": 0.25,\n \"organic_strong_target_weight\": 1.0,\n \"organic_like_target_weight\": 3.0,\n \"discovery_horizon_days\": 7,\n \"validation_fraction\": 0.1,\n \"max_train_targets_per_user\": 128,\n \"max_validation_targets_per_user\": 16,\n \"early_stopping_patience\": 1,\n \"early_stopping_min_delta\": 0.0001,\n \"seed\": 29\n },\n \"sequence_tokens\": 20056329,\n \"all_next_item_targets\": 20047194,\n \"selected_training_targets\": 1052953,\n \"selected_validation_targets\": 130103,\n \"discarded_old_targets\": 18864138,\n \"training_history\": [\n {\n \"epoch\": 1.0,\n \"loss\": 0.5225590736606819,\n \"positive_logit\": 0.8863575044622087,\n \"negative_logit\": -0.7952952123983079,\n \"pair_accuracy\": 0.7933858693123055,\n \"targets\": 1052953.0,\n \"target_weight_sum\": 632551.0,\n \"batches\": 266.0,\n \"seconds\": 200.95214525499978,\n \"validation_loss\": 0.47644699459287015,\n \"validation_targets\": 130103.0,\n \"validation_target_weight_sum\": 78769.25,\n \"validation_seconds\": 16.441554377999637\n }\n ],\n \"embedding_diagnostics\": {\n \"query_norm_mean\": 1.4792938232421875,\n \"query_norm_std\": 0.6746419668197632,\n \"item_norm_mean\": 1.789298176765442,\n \"item_norm_std\": 0.8772290945053101\n },\n \"torch_version\": \"2.8.0+cpu\",\n \"device\": \"cpu\"\n}\n" } } ### exec · 2026-09-23T22:07:18.893Z { "code": "const r = await tools.exec_command({cmd:\"/opt/task-venv/bin/python /task/evaluate_public.py /app/solution/uniform_validation.parquet\",\"workdir\":\"/app\",\"yield_time_ms\":30000,\"max_output_tokens\":3000}); text(r.output)\n" } ### Tool output · 2026-09-23T22:07:22.426Z Script completed Wall time 3.5 seconds Output: { "model": "/app/solution/uniform_validation.parquet", "scores": { "quality_ndcg@10": 0.01957, "quality_users": 4263 } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44d93ed7c87d2b1a53eaaf5007530", "usage": { "input_tokens": 64148, "cached_input_tokens": 62848, "cache_write_input_tokens": 0, "output_tokens": 68, "reasoning_output_tokens": 0, "total_tokens": 64216 }, "turn_token_usage": { "input_tokens": 3051412, "cached_input_tokens": 2938496, "cache_write_input_tokens": 0, "output_tokens": 10485, "reasoning_output_tokens": 3442, "total_tokens": 3061897 }, "thread_token_usage": { "input_tokens": 3051412, "cached_input_tokens": 2938496, "cache_write_input_tokens": 0, "output_tokens": 10485, "reasoning_output_tokens": 3442, "total_tokens": 3061897 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-49b70bd9-2ddd-46b0-b0bd-bbbd3afad92f", "process_id": "62925", "command": [ "/bin/sh", "-lc", "/opt/task-venv/bin/python /task/evaluate_public.py /app/solution/uniform_validation.parquet" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "/opt/task-venv/bin/python /task/evaluate_public.py /app/solution/uniform_validation.parquet" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "{\n \"model\": \"/app/solution/uniform_validation.parquet\",\n \"scores\": {\n \"quality_ndcg@10\": 0.01957,\n \"quality_users\": 4263\n }\n}\n", "stderr": "", "aggregated_output": "{\n \"model\": \"/app/solution/uniform_validation.parquet\",\n \"scores\": {\n \"quality_ndcg@10\": 0.01957,\n \"quality_users\": 4263\n }\n}\n", "exit_code": 0, "duration": { "secs": 3, "nanos": 361779214 }, "formatted_output": "{\n \"model\": \"/app/solution/uniform_validation.parquet\",\n \"scores\": {\n \"quality_ndcg@10\": 0.01957,\n \"quality_users\": 4263\n }\n}\n" } } ## Step 50 · agent · 2026-09-23T22:07:45.073Z ### Thinking unavailable — no text recorded ## Step 51 · agent · 2026-09-23T22:07:52.683Z ### Thinking unavailable — no text recorded The 32-uniform ablation scores 0.01957, also below production. That brackets the useful mixture: in-batch negatives add signal, but too many or uncorrected ones damage popularity calibration. I’m now testing a warm-start curriculum—first broad catalog coverage, then low-rate semi-hard refinement—because mining from random initialization made early “hardness” mostly noise. ### exec · 2026-09-23T22:08:02.820Z { "code": "const r = await tools.exec_command({cmd:\"PYTHONPATH=/app/solution /opt/task-venv/bin/python - <<'PY'\\nimport numpy as np\\nz=np.load('/app/solution/validation_cache.npz')\\no=z['offsets']; states=z['state_ids']; sc=z['state_counts']; lengths=np.diff(o); vals=[]\\nfor row,n in enumerate(lengths):\\n if n>1:\\n st=states[o[row]+max(0,n-129):o[row]+n-1]\\n vals.extend(sc[st,1].tolist())\\na=np.array(vals)\\nprint('retained target contexts',len(a),'active dislike fraction',np.mean(a>0),'q',np.quantile(a,[0,.5,.75,.9,.99,1]))\\nPY\",\"workdir\":\"/app\",\"yield_time_ms\":30000,\"max_output_tokens\":3000}); text(r.output)\n" } ### Tool output · 2026-09-23T22:08:03.529Z Script completed Wall time 0.7 seconds Output: retained target contexts 1059394 active dislike fraction 0.4991957666363978 q [ 0. 0. 3. 9. 82. 1703.] ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44d9aa58c87d29e465e465d64b9f7", "usage": { "input_tokens": 64285, "cached_input_tokens": 64000, "cache_write_input_tokens": 0, "output_tokens": 1050, "reasoning_output_tokens": 753, "total_tokens": 65335 }, "turn_token_usage": { "input_tokens": 3115697, "cached_input_tokens": 3002496, "cache_write_input_tokens": 0, "output_tokens": 11535, "reasoning_output_tokens": 4195, "total_tokens": 3127232 }, "thread_token_usage": { "input_tokens": 3115697, "cached_input_tokens": 3002496, "cache_write_input_tokens": 0, "output_tokens": 11535, "reasoning_output_tokens": 4195, "total_tokens": 3127232 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-0e750536-e774-478f-af13-9abca1d651c8", "process_id": "18997", "command": [ "/bin/sh", "-lc", "PYTHONPATH=/app/solution /opt/task-venv/bin/python - <<'PY'\nimport numpy as np\nz=np.load('/app/solution/validation_cache.npz')\no=z['offsets']; states=z['state_ids']; sc=z['state_counts']; lengths=np.diff(o); vals=[]\nfor row,n in enumerate(lengths):\n if n>1:\n st=states[o[row]+max(0,n-129):o[row]+n-1]\n vals.extend(sc[st,1].tolist())\na=np.array(vals)\nprint('retained target contexts',len(a),'active dislike fraction',np.mean(a>0),'q',np.quantile(a,[0,.5,.75,.9,.99,1]))\nPY" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "PYTHONPATH=/app/solution /opt/task-venv/bin/python - <<'PY'\nimport numpy as np\nz=np.load('/app/solution/validation_cache.npz')\no=z['offsets']; states=z['state_ids']; sc=z['state_counts']; lengths=np.diff(o); vals=[]\nfor row,n in enumerate(lengths):\n if n>1:\n st=states[o[row]+max(0,n-129):o[row]+n-1]\n vals.extend(sc[st,1].tolist())\na=np.array(vals)\nprint('retained target contexts',len(a),'active dislike fraction',np.mean(a>0),'q',np.quantile(a,[0,.5,.75,.9,.99,1]))\nPY" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "retained target contexts 1059394 active dislike fraction 0.4991957666363978 q [ 0. 0. 3. 9. 82. 1703.]\n", "stderr": "", "aggregated_output": "retained target contexts 1059394 active dislike fraction 0.4991957666363978 q [ 0. 0. 3. 9. 82. 1703.]\n", "exit_code": 0, "duration": { "secs": 0, "nanos": 539816956 }, "formatted_output": "retained target contexts 1059394 active dislike fraction 0.4991957666363978 q [ 0. 0. 3. 9. 82. 1703.]\n" } } ## Step 52 · agent · 2026-09-23T22:08:21.339Z ### Thinking unavailable — no text recorded ## Step 53 · agent · 2026-09-23T22:08:21.819Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:08:43.425Z { "code": "const patch = \"*** Begin Patch\\n*** Update File: /app/solution/train_current_model.py\\n@@\\n hard_inbatch_pool: int = 0\\n+ explicit_dislike_negatives: int = 0\\n@@\\n def draw_full_history_filtered_negatives(\\n targets: torch.Tensor,\\n user_rows: np.ndarray,\\n liked_items: torch.Tensor,\\n+ disliked_items: torch.Tensor,\\n@@\\n- negatives = torch.cat([uniform, inbatch], dim=1).numpy()\\n+ explicit_dislikes = torch.empty((batch_size, 0), dtype=torch.long)\\n+ if config.explicit_dislike_negatives:\\n+ disliked_cpu = disliked_items.detach().cpu()\\n+ priorities = torch.rand(disliked_cpu.shape, generator=generator)\\n+ priorities.masked_fill_(disliked_cpu.eq(n_items), -1.0)\\n+ columns = torch.topk(\\n+ priorities, k=config.explicit_dislike_negatives, dim=1\\n+ ).indices\\n+ explicit_dislikes = disliked_cpu.gather(1, columns)\\n+ missing = explicit_dislikes.eq(n_items)\\n+ if bool(missing.any()):\\n+ explicit_dislikes[missing] = torch.randint(\\n+ n_items, (int(missing.sum()),), generator=generator\\n+ )\\n+\\n+ negatives = torch.cat([uniform, inbatch, explicit_dislikes], dim=1).numpy()\\n@@\\n def draw_training_negatives(\\n@@\\n liked_items: torch.Tensor,\\n+ disliked_items: torch.Tensor,\\n@@\\n liked_items,\\n+ disliked_items,\\n@@\\n- return base.draw_filtered_mixed_negatives(\\n+ if config.explicit_dislike_negatives:\\n+ raise RuntimeError(\\\"explicit dislike negatives require full-history filtering\\\")\\n+ return base.draw_filtered_mixed_negatives(\\n@@\\n def corrected_negative_loss(\\n@@\\n- total = config.uniform_negatives + config.inbatch_negatives\\n+ total = (\\n+ config.uniform_negatives\\n+ + config.inbatch_negatives\\n+ + config.explicit_dislike_negatives\\n+ )\\n@@\\n if config.inbatch_negatives:\\n@@\\n result += config.inbatch_negatives * (\\n@@\\n )\\n+ if config.explicit_dislike_negatives:\\n+ pool_size = max(config.inbatch_negatives, config.hard_inbatch_pool)\\n+ start = config.uniform_negatives + pool_size\\n+ selected = raw[:, start : start + config.explicit_dislike_negatives]\\n+ result += config.explicit_dislike_negatives * selected.mean(dim=1)\\n@@\\n- negative_count = config.uniform_negatives + config.inbatch_negatives\\n+ negative_count = (\\n+ config.uniform_negatives\\n+ + config.inbatch_negatives\\n+ + config.explicit_dislike_negatives\\n+ )\\n*** End Patch\";\ntext(await tools.apply_patch(patch));\n" } ### Tool output · 2026-09-23T22:08:43.506Z Script completed Wall time 0.0 seconds Output: {} ### Harness context { "type": "codex_item_completed", "item": { "type": "FileChange", "id": "exec-1ae87585-3dff-4584-a42d-b4d0ced92175", "changes": { "/app/solution/train_current_model.py": { "type": "update", "unified_diff": "@@ -58,2 +58,3 @@\n hard_inbatch_pool: int = 0\n+ explicit_dislike_negatives: int = 0\n inbatch_correction_power: float = 0.5\n@@ -634,2 +635,3 @@\n liked_items: torch.Tensor,\n+ disliked_items: torch.Tensor,\n known_positive_packed: np.ndarray,\n@@ -682,3 +684,18 @@\n \n- negatives = torch.cat([uniform, inbatch], dim=1).numpy()\n+ explicit_dislikes = torch.empty((batch_size, 0), dtype=torch.long)\n+ if config.explicit_dislike_negatives:\n+ disliked_cpu = disliked_items.detach().cpu()\n+ priorities = torch.rand(disliked_cpu.shape, generator=generator)\n+ priorities.masked_fill_(disliked_cpu.eq(n_items), -1.0)\n+ columns = torch.topk(\n+ priorities, k=config.explicit_dislike_negatives, dim=1\n+ ).indices\n+ explicit_dislikes = disliked_cpu.gather(1, columns)\n+ missing = explicit_dislikes.eq(n_items)\n+ if bool(missing.any()):\n+ explicit_dislikes[missing] = torch.randint(\n+ n_items, (int(missing.sum()),), generator=generator\n+ )\n+\n+ negatives = torch.cat([uniform, inbatch, explicit_dislikes], dim=1).numpy()\n correction = np.ones_like(negatives, dtype=np.float32)\n@@ -729,2 +746,3 @@\n liked_items: torch.Tensor,\n+ disliked_items: torch.Tensor,\n user_rows: np.ndarray,\n@@ -744,2 +762,3 @@\n liked_items,\n+ disliked_items,\n known_positive_packed,\n@@ -751,2 +770,4 @@\n )\n+ if config.explicit_dislike_negatives:\n+ raise RuntimeError(\"explicit dislike negatives require full-history filtering\")\n return base.draw_filtered_mixed_negatives(\n@@ -852,3 +873,7 @@\n raw = F.softplus(logits)\n- total = config.uniform_negatives + config.inbatch_negatives\n+ total = (\n+ config.uniform_negatives\n+ + config.inbatch_negatives\n+ + config.explicit_dislike_negatives\n+ )\n result = torch.zeros(len(logits), device=logits.device)\n@@ -877,2 +902,7 @@\n )\n+ if config.explicit_dislike_negatives:\n+ pool_size = max(config.inbatch_negatives, config.hard_inbatch_pool)\n+ start = config.uniform_negatives + pool_size\n+ selected = raw[:, start : start + config.explicit_dislike_negatives]\n+ result += config.explicit_dislike_negatives * selected.mean(dim=1)\n return result / total\n@@ -1240,3 +1270,7 @@\n group_order = torch.randperm(len(groups), generator=generator).numpy()\n- negative_count = config.uniform_negatives + config.inbatch_negatives\n+ negative_count = (\n+ config.uniform_negatives\n+ + config.inbatch_negatives\n+ + config.explicit_dislike_negatives\n+ )\n total_loss = 0.0\n", "move_path": null } }, "status": "completed", "stdout": "Success. Updated the following files:\nM /app/solution/train_current_model.py\n", "stderr": "" } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44dc3cca087d2b7214711bbc6c9ed", "usage": { "input_tokens": 65404, "cached_input_tokens": 64128, "cache_write_input_tokens": 0, "output_tokens": 1208, "reasoning_output_tokens": 525, "total_tokens": 66612 }, "turn_token_usage": { "input_tokens": 3181101, "cached_input_tokens": 3066624, "cache_write_input_tokens": 0, "output_tokens": 12743, "reasoning_output_tokens": 4720, "total_tokens": 3193844 }, "thread_token_usage": { "input_tokens": 3181101, "cached_input_tokens": 3066624, "cache_write_input_tokens": 0, "output_tokens": 12743, "reasoning_output_tokens": 4720, "total_tokens": 3193844 } } ## Step 54 · agent · 2026-09-23T22:08:50.938Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:08:57.513Z { "code": "const patch = \"*** Begin Patch\\n*** Update File: /app/solution/train_current_model.py\\n@@\\n liked_items = torch.from_numpy(\\n prepared.liked_states[flat_states].astype(np.int64)\\n ).to(device)\\n+ disliked_items = torch.from_numpy(\\n+ prepared.disliked_states[flat_states].astype(np.int64)\\n+ ).to(device)\\n@@\\n known_history,\\n liked_items,\\n+ disliked_items,\\n@@\\n liked_items = torch.from_numpy(\\n prepared.liked_states[flat_states].astype(np.int64)\\n ).to(device)\\n+ disliked_items = torch.from_numpy(\\n+ prepared.disliked_states[flat_states].astype(np.int64)\\n+ ).to(device)\\n@@\\n known_history,\\n liked_items,\\n+ disliked_items,\\n*** End Patch\";\ntext(await tools.apply_patch(patch));\n" } ### Tool output · 2026-09-23T22:08:57.655Z Script completed Wall time 0.0 seconds Output: {} ### Harness context { "type": "codex_item_completed", "item": { "type": "FileChange", "id": "exec-c433783c-7873-4dc5-b08b-a1c4d7eecc01", "changes": { "/app/solution/train_current_model.py": { "type": "update", "unified_diff": "@@ -1337,2 +1337,5 @@\n ).to(device)\n+ disliked_items = torch.from_numpy(\n+ prepared.disliked_states[flat_states].astype(np.int64)\n+ ).to(device)\n flat_user_rows = np.broadcast_to(\n@@ -1344,2 +1347,3 @@\n liked_items,\n+ disliked_items,\n flat_user_rows,\n@@ -1493,2 +1497,5 @@\n ).to(device)\n+ disliked_items = torch.from_numpy(\n+ prepared.disliked_states[flat_states].astype(np.int64)\n+ ).to(device)\n flat_user_rows = np.broadcast_to(\n@@ -1500,2 +1507,3 @@\n liked_items,\n+ disliked_items,\n flat_user_rows,\n", "move_path": null } }, "status": "completed", "stdout": "Success. Updated the following files:\nM /app/solution/train_current_model.py\n", "stderr": "" } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44debdd8c87d2bc9350d80d91d705", "usage": { "input_tokens": 66636, "cached_input_tokens": 65280, "cache_write_input_tokens": 0, "output_tokens": 241, "reasoning_output_tokens": 27, "total_tokens": 66877 }, "turn_token_usage": { "input_tokens": 3247737, "cached_input_tokens": 3131904, "cache_write_input_tokens": 0, "output_tokens": 12984, "reasoning_output_tokens": 4747, "total_tokens": 3260721 }, "thread_token_usage": { "input_tokens": 3247737, "cached_input_tokens": 3131904, "cache_write_input_tokens": 0, "output_tokens": 12984, "reasoning_output_tokens": 4747, "total_tokens": 3260721 } } ## Step 55 · agent · 2026-09-23T22:09:00.864Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:09:04.749Z { "code": "const r = await tools.exec_command({cmd:\"sed -n '625,780p' /app/solution/train_current_model.py; sed -n '1285,1325p' /app/solution/train_current_model.py; sed -n '1455,1495p' /app/solution/train_current_model.py; rg -n \\\"negative_count =|explicit-dislike|hard-inbatch\\\" /app/solution/train_current_model.py\",\"workdir\":\"/app\",\"yield_time_ms\":10000,\"max_output_tokens\":16000}); text(r.output)\n" } ### Tool output · 2026-09-23T22:09:04.855Z Script completed Wall time 0.0 seconds Output: for column in range(1, negatives.shape[1]): invalid[:, column] |= ( negatives[:, column, None] == negatives[:, :column] ).any(axis=1) return invalid def draw_full_history_filtered_negatives( targets: torch.Tensor, user_rows: np.ndarray, liked_items: torch.Tensor, disliked_items: torch.Tensor, known_positive_packed: np.ndarray, n_items: int, config: Config, item_correction: torch.Tensor, generator: torch.Generator, device: torch.device, ) -> tuple[torch.Tensor, torch.Tensor]: """Draw mixed negatives and reject all known public-training positives.""" targets_cpu = targets.detach().cpu().numpy().astype(np.int64, copy=False) liked_cpu = liked_items.detach().cpu().numpy().astype(np.int64, copy=False) batch_size = len(targets_cpu) uniform = torch.randint( n_items, (batch_size, config.uniform_negatives), generator=generator, device="cpu", ) inbatch = torch.empty((batch_size, 0), dtype=torch.long) corrected_count = 0 inbatch_draw_count = max(config.inbatch_negatives, config.hard_inbatch_pool) if inbatch_draw_count: unique_targets = torch.unique(targets.detach().cpu()) corrected_count = min( inbatch_draw_count, max(len(unique_targets) - 1, 0) ) if corrected_count: priorities = torch.rand( (batch_size, len(unique_targets)), generator=generator ) priorities.masked_fill_( unique_targets[None, :].eq( torch.from_numpy(targets_cpu)[:, None] ), -1.0, ) columns = torch.topk( priorities, k=corrected_count, dim=1 ).indices inbatch = unique_targets[columns] if corrected_count < inbatch_draw_count: filler = torch.randint( n_items, (batch_size, inbatch_draw_count - corrected_count), generator=generator, device="cpu", ) inbatch = torch.cat([inbatch, filler], dim=1) explicit_dislikes = torch.empty((batch_size, 0), dtype=torch.long) if config.explicit_dislike_negatives: disliked_cpu = disliked_items.detach().cpu() priorities = torch.rand(disliked_cpu.shape, generator=generator) priorities.masked_fill_(disliked_cpu.eq(n_items), -1.0) columns = torch.topk( priorities, k=config.explicit_dislike_negatives, dim=1 ).indices explicit_dislikes = disliked_cpu.gather(1, columns) missing = explicit_dislikes.eq(n_items) if bool(missing.any()): explicit_dislikes[missing] = torch.randint( n_items, (int(missing.sum()),), generator=generator ) negatives = torch.cat([uniform, inbatch, explicit_dislikes], dim=1).numpy() correction = np.ones_like(negatives, dtype=np.float32) if corrected_count: correction[ :, config.uniform_negatives : config.uniform_negatives + corrected_count ] = item_correction[inbatch[:, :corrected_count]].numpy() for _ in range(32): invalid = invalid_full_history_negatives( negatives, targets_cpu, user_rows, known_positive_packed, liked_cpu, ) if not np.any(invalid): return ( torch.from_numpy(negatives).to(device), torch.from_numpy(correction).to(device), ) replacements = torch.randint( n_items, (int(invalid.sum()),), generator=generator, device="cpu", ).numpy() negatives[invalid] = replacements # Rejected in-batch items become ordinary uniform draws. correction[invalid] = 1.0 invalid = invalid_full_history_negatives( negatives, targets_cpu, user_rows, known_positive_packed, liked_cpu, ) if np.any(invalid): raise RuntimeError("full-history negative resampling failed") return ( torch.from_numpy(negatives).to(device), torch.from_numpy(correction).to(device), ) def draw_training_negatives( positive_items: torch.Tensor, known_history: torch.Tensor, liked_items: torch.Tensor, disliked_items: torch.Tensor, user_rows: np.ndarray, known_positive_packed: np.ndarray | None, prepared: SequenceData, config: Config, item_correction: torch.Tensor, generator: torch.Generator, device: torch.device, ) -> tuple[torch.Tensor, torch.Tensor]: if config.negative_filter_scope == "full-training-history": if known_positive_packed is None: raise RuntimeError("full-history negative filter was not built") return draw_full_history_filtered_negatives( positive_items, user_rows, liked_items, disliked_items, known_positive_packed, len(prepared.item_ids), config, item_correction, generator, device, ) if config.explicit_dislike_negatives: raise RuntimeError("explicit dislike negatives require full-history filtering") return base.draw_filtered_mixed_negatives( positive_items, known_history, liked_items, len(prepared.item_ids), config.uniform_negatives, config.inbatch_negatives, item_correction, for group_number in group_order: users = groups[int(group_number)] group_counts = target_counts[users] hidden = torch.zeros( 1, len(users), config.embedding_dim, device=device ) max_targets = int(group_counts.max()) for start in range(0, max_targets, config.bptt_steps): steps = min(config.bptt_steps, max_targets - start) block = build_dense_block( prepared, target_weights, users, window_starts[users], group_counts, np.zeros(len(users), dtype=np.int64), start, steps, config, ) sequence_outputs, _ = event_sequence( model, torch.from_numpy(block[0].astype(np.int64)).to(device), torch.from_numpy(block[1].astype(np.float32)).to(device), hidden, ) hidden = torch.stack( [ sequence_outputs[row, count - 1] if count else hidden[0, row] for row, count in enumerate(block[7]) ] ).unsqueeze(0).detach() flat_scored = block[5].reshape(-1) if not np.any(flat_scored): continue mask = torch.from_numpy(flat_scored).to(device) sequence_vectors = sequence_outputs.reshape( -1, config.embedding_dim )[mask] prepared, target_weights, users, window_starts[users], group_totals, group_starts, start, steps, config, ) sequence_outputs, _ = event_sequence( model, torch.from_numpy(block[0].astype(np.int64)).to(device), torch.from_numpy(block[1].astype(np.float32)).to(device), hidden, ) hidden = torch.stack( [ sequence_outputs[row, count - 1] if count else hidden[0, row] for row, count in enumerate(block[7]) ] ).unsqueeze(0) flat_scored = block[5].reshape(-1) if not np.any(flat_scored): continue mask = torch.from_numpy(flat_scored).to(device) sequence_vectors = sequence_outputs.reshape( -1, config.embedding_dim )[mask] flat_states = block[3].reshape(-1)[flat_scored] positive_items = torch.from_numpy( block[4].reshape(-1)[flat_scored].astype(np.int64) ).to(device) known_history = torch.from_numpy( block[6].reshape(-1, config.bptt_steps)[flat_scored].astype( np.int64 ) ).to(device) liked_items = torch.from_numpy( 1271: negative_count = ( 2001: "--hard-inbatch-pool", type=int, default=Config.hard_inbatch_pool, ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-96cdf255-c07d-44c1-856b-f5f7ba6afc1c", "process_id": "92201", "command": [ "/bin/sh", "-lc", "sed -n '625,780p' /app/solution/train_current_model.py; sed -n '1285,1325p' /app/solution/train_current_model.py; sed -n '1455,1495p' /app/solution/train_current_model.py; rg -n \"negative_count =|explicit-dislike|hard-inbatch\" /app/solution/train_current_model.py" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "read", "cmd": "sed -n '625,780p' /app/solution/train_current_model.py", "name": "train_current_model.py", "path": "/app/solution/train_current_model.py" }, { "type": "read", "cmd": "sed -n '1285,1325p' /app/solution/train_current_model.py", "name": "train_current_model.py", "path": "/app/solution/train_current_model.py" }, { "type": "read", "cmd": "sed -n '1455,1495p' /app/solution/train_current_model.py", "name": "train_current_model.py", "path": "/app/solution/train_current_model.py" }, { "type": "search", "cmd": "rg -n 'negative_count =|explicit-dislike|hard-inbatch' /app/solution/train_current_model.py", "query": "negative_count =|explicit-dislike|hard-inbatch", "path": "train_current_model.py" } ], "source": "unified_exec_startup", "status": "completed", "stdout": " for column in range(1, negatives.shape[1]):\n invalid[:, column] |= (\n negatives[:, column, None] == negatives[:, :column]\n ).any(axis=1)\n return invalid\n\n\ndef draw_full_history_filtered_negatives(\n targets: torch.Tensor,\n user_rows: np.ndarray,\n liked_items: torch.Tensor,\n disliked_items: torch.Tensor,\n known_positive_packed: np.ndarray,\n n_items: int,\n config: Config,\n item_correction: torch.Tensor,\n generator: torch.Generator,\n device: torch.device,\n) -> tuple[torch.Tensor, torch.Tensor]:\n \"\"\"Draw mixed negatives and reject all known public-training positives.\"\"\"\n targets_cpu = targets.detach().cpu().numpy().astype(np.int64, copy=False)\n liked_cpu = liked_items.detach().cpu().numpy().astype(np.int64, copy=False)\n batch_size = len(targets_cpu)\n uniform = torch.randint(\n n_items,\n (batch_size, config.uniform_negatives),\n generator=generator,\n device=\"cpu\",\n )\n inbatch = torch.empty((batch_size, 0), dtype=torch.long)\n corrected_count = 0\n inbatch_draw_count = max(config.inbatch_negatives, config.hard_inbatch_pool)\n if inbatch_draw_count:\n unique_targets = torch.unique(targets.detach().cpu())\n corrected_count = min(\n inbatch_draw_count, max(len(unique_targets) - 1, 0)\n )\n if corrected_count:\n priorities = torch.rand(\n (batch_size, len(unique_targets)), generator=generator\n )\n priorities.masked_fill_(\n unique_targets[None, :].eq(\n torch.from_numpy(targets_cpu)[:, None]\n ),\n -1.0,\n )\n columns = torch.topk(\n priorities, k=corrected_count, dim=1\n ).indices\n inbatch = unique_targets[columns]\n if corrected_count < inbatch_draw_count:\n filler = torch.randint(\n n_items,\n (batch_size, inbatch_draw_count - corrected_count),\n generator=generator,\n device=\"cpu\",\n )\n inbatch = torch.cat([inbatch, filler], dim=1)\n\n explicit_dislikes = torch.empty((batch_size, 0), dtype=torch.long)\n if config.explicit_dislike_negatives:\n disliked_cpu = disliked_items.detach().cpu()\n priorities = torch.rand(disliked_cpu.shape, generator=generator)\n priorities.masked_fill_(disliked_cpu.eq(n_items), -1.0)\n columns = torch.topk(\n priorities, k=config.explicit_dislike_negatives, dim=1\n ).indices\n explicit_dislikes = disliked_cpu.gather(1, columns)\n missing = explicit_dislikes.eq(n_items)\n if bool(missing.any()):\n explicit_dislikes[missing] = torch.randint(\n n_items, (int(missing.sum()),), generator=generator\n )\n\n negatives = torch.cat([uniform, inbatch, explicit_dislikes], dim=1).numpy()\n correction = np.ones_like(negatives, dtype=np.float32)\n if corrected_count:\n correction[\n :, config.uniform_negatives : config.uniform_negatives + corrected_count\n ] = item_correction[inbatch[:, :corrected_count]].numpy()\n for _ in range(32):\n invalid = invalid_full_history_negatives(\n negatives,\n targets_cpu,\n user_rows,\n known_positive_packed,\n liked_cpu,\n )\n if not np.any(invalid):\n return (\n torch.from_numpy(negatives).to(device),\n torch.from_numpy(correction).to(device),\n )\n replacements = torch.randint(\n n_items,\n (int(invalid.sum()),),\n generator=generator,\n device=\"cpu\",\n ).numpy()\n negatives[invalid] = replacements\n # Rejected in-batch items become ordinary uniform draws.\n correction[invalid] = 1.0\n invalid = invalid_full_history_negatives(\n negatives,\n targets_cpu,\n user_rows,\n known_positive_packed,\n liked_cpu,\n )\n if np.any(invalid):\n raise RuntimeError(\"full-history negative resampling failed\")\n return (\n torch.from_numpy(negatives).to(device),\n torch.from_numpy(correction).to(device),\n )\n\n\ndef draw_training_negatives(\n positive_items: torch.Tensor,\n known_history: torch.Tensor,\n liked_items: torch.Tensor,\n disliked_items: torch.Tensor,\n user_rows: np.ndarray,\n known_positive_packed: np.ndarray | None,\n prepared: SequenceData,\n config: Config,\n item_correction: torch.Tensor,\n generator: torch.Generator,\n device: torch.device,\n) -> tuple[torch.Tensor, torch.Tensor]:\n if config.negative_filter_scope == \"full-training-history\":\n if known_positive_packed is None:\n raise RuntimeError(\"full-history negative filter was not built\")\n return draw_full_history_filtered_negatives(\n positive_items,\n user_rows,\n liked_items,\n disliked_items,\n known_positive_packed,\n len(prepared.item_ids),\n config,\n item_correction,\n generator,\n device,\n )\n if config.explicit_dislike_negatives:\n raise RuntimeError(\"explicit dislike negatives require full-history filtering\")\n return base.draw_filtered_mixed_negatives(\n positive_items,\n known_history,\n liked_items,\n len(prepared.item_ids),\n config.uniform_negatives,\n config.inbatch_negatives,\n item_correction,\n for group_number in group_order:\n users = groups[int(group_number)]\n group_counts = target_counts[users]\n hidden = torch.zeros(\n 1, len(users), config.embedding_dim, device=device\n )\n max_targets = int(group_counts.max())\n for start in range(0, max_targets, config.bptt_steps):\n steps = min(config.bptt_steps, max_targets - start)\n block = build_dense_block(\n prepared,\n target_weights,\n users,\n window_starts[users],\n group_counts,\n np.zeros(len(users), dtype=np.int64),\n start,\n steps,\n config,\n )\n sequence_outputs, _ = event_sequence(\n model,\n torch.from_numpy(block[0].astype(np.int64)).to(device),\n torch.from_numpy(block[1].astype(np.float32)).to(device),\n hidden,\n )\n hidden = torch.stack(\n [\n sequence_outputs[row, count - 1]\n if count\n else hidden[0, row]\n for row, count in enumerate(block[7])\n ]\n ).unsqueeze(0).detach()\n flat_scored = block[5].reshape(-1)\n if not np.any(flat_scored):\n continue\n mask = torch.from_numpy(flat_scored).to(device)\n sequence_vectors = sequence_outputs.reshape(\n -1, config.embedding_dim\n )[mask]\n prepared,\n target_weights,\n users,\n window_starts[users],\n group_totals,\n group_starts,\n start,\n steps,\n config,\n )\n sequence_outputs, _ = event_sequence(\n model,\n torch.from_numpy(block[0].astype(np.int64)).to(device),\n torch.from_numpy(block[1].astype(np.float32)).to(device),\n hidden,\n )\n hidden = torch.stack(\n [\n sequence_outputs[row, count - 1]\n if count\n else hidden[0, row]\n for row, count in enumerate(block[7])\n ]\n ).unsqueeze(0)\n flat_scored = block[5].reshape(-1)\n if not np.any(flat_scored):\n continue\n mask = torch.from_numpy(flat_scored).to(device)\n sequence_vectors = sequence_outputs.reshape(\n -1, config.embedding_dim\n )[mask]\n flat_states = block[3].reshape(-1)[flat_scored]\n positive_items = torch.from_numpy(\n block[4].reshape(-1)[flat_scored].astype(np.int64)\n ).to(device)\n known_history = torch.from_numpy(\n block[6].reshape(-1, config.bptt_steps)[flat_scored].astype(\n np.int64\n )\n ).to(device)\n liked_items = torch.from_numpy(\n1271: negative_count = (\n2001: \"--hard-inbatch-pool\", type=int, default=Config.hard_inbatch_pool,\n", "stderr": "", "aggregated_output": " for column in range(1, negatives.shape[1]):\n invalid[:, column] |= (\n negatives[:, column, None] == negatives[:, :column]\n ).any(axis=1)\n return invalid\n\n\ndef draw_full_history_filtered_negatives(\n targets: torch.Tensor,\n user_rows: np.ndarray,\n liked_items: torch.Tensor,\n disliked_items: torch.Tensor,\n known_positive_packed: np.ndarray,\n n_items: int,\n config: Config,\n item_correction: torch.Tensor,\n generator: torch.Generator,\n device: torch.device,\n) -> tuple[torch.Tensor, torch.Tensor]:\n \"\"\"Draw mixed negatives and reject all known public-training positives.\"\"\"\n targets_cpu = targets.detach().cpu().numpy().astype(np.int64, copy=False)\n liked_cpu = liked_items.detach().cpu().numpy().astype(np.int64, copy=False)\n batch_size = len(targets_cpu)\n uniform = torch.randint(\n n_items,\n (batch_size, config.uniform_negatives),\n generator=generator,\n device=\"cpu\",\n )\n inbatch = torch.empty((batch_size, 0), dtype=torch.long)\n corrected_count = 0\n inbatch_draw_count = max(config.inbatch_negatives, config.hard_inbatch_pool)\n if inbatch_draw_count:\n unique_targets = torch.unique(targets.detach().cpu())\n corrected_count = min(\n inbatch_draw_count, max(len(unique_targets) - 1, 0)\n )\n if corrected_count:\n priorities = torch.rand(\n (batch_size, len(unique_targets)), generator=generator\n )\n priorities.masked_fill_(\n unique_targets[None, :].eq(\n torch.from_numpy(targets_cpu)[:, None]\n ),\n -1.0,\n )\n columns = torch.topk(\n priorities, k=corrected_count, dim=1\n ).indices\n inbatch = unique_targets[columns]\n if corrected_count < inbatch_draw_count:\n filler = torch.randint(\n n_items,\n (batch_size, inbatch_draw_count - corrected_count),\n generator=generator,\n device=\"cpu\",\n )\n inbatch = torch.cat([inbatch, filler], dim=1)\n\n explicit_dislikes = torch.empty((batch_size, 0), dtype=torch.long)\n if config.explicit_dislike_negatives:\n disliked_cpu = disliked_items.detach().cpu()\n priorities = torch.rand(disliked_cpu.shape, generator=generator)\n priorities.masked_fill_(disliked_cpu.eq(n_items), -1.0)\n columns = torch.topk(\n priorities, k=config.explicit_dislike_negatives, dim=1\n ).indices\n explicit_dislikes = disliked_cpu.gather(1, columns)\n missing = explicit_dislikes.eq(n_items)\n if bool(missing.any()):\n explicit_dislikes[missing] = torch.randint(\n n_items, (int(missing.sum()),), generator=generator\n )\n\n negatives = torch.cat([uniform, inbatch, explicit_dislikes], dim=1).numpy()\n correction = np.ones_like(negatives, dtype=np.float32)\n if corrected_count:\n correction[\n :, config.uniform_negatives : config.uniform_negatives + corrected_count\n ] = item_correction[inbatch[:, :corrected_count]].numpy()\n for _ in range(32):\n invalid = invalid_full_history_negatives(\n negatives,\n targets_cpu,\n user_rows,\n known_positive_packed,\n liked_cpu,\n )\n if not np.any(invalid):\n return (\n torch.from_numpy(negatives).to(device),\n torch.from_numpy(correction).to(device),\n )\n replacements = torch.randint(\n n_items,\n (int(invalid.sum()),),\n generator=generator,\n device=\"cpu\",\n ).numpy()\n negatives[invalid] = replacements\n # Rejected in-batch items become ordinary uniform draws.\n correction[invalid] = 1.0\n invalid = invalid_full_history_negatives(\n negatives,\n targets_cpu,\n user_rows,\n known_positive_packed,\n liked_cpu,\n )\n if np.any(invalid):\n raise RuntimeError(\"full-history negative resampling failed\")\n return (\n torch.from_numpy(negatives).to(device),\n torch.from_numpy(correction).to(device),\n )\n\n\ndef draw_training_negatives(\n positive_items: torch.Tensor,\n known_history: torch.Tensor,\n liked_items: torch.Tensor,\n disliked_items: torch.Tensor,\n user_rows: np.ndarray,\n known_positive_packed: np.ndarray | None,\n prepared: SequenceData,\n config: Config,\n item_correction: torch.Tensor,\n generator: torch.Generator,\n device: torch.device,\n) -> tuple[torch.Tensor, torch.Tensor]:\n if config.negative_filter_scope == \"full-training-history\":\n if known_positive_packed is None:\n raise RuntimeError(\"full-history negative filter was not built\")\n return draw_full_history_filtered_negatives(\n positive_items,\n user_rows,\n liked_items,\n disliked_items,\n known_positive_packed,\n len(prepared.item_ids),\n config,\n item_correction,\n generator,\n device,\n )\n if config.explicit_dislike_negatives:\n raise RuntimeError(\"explicit dislike negatives require full-history filtering\")\n return base.draw_filtered_mixed_negatives(\n positive_items,\n known_history,\n liked_items,\n len(prepared.item_ids),\n config.uniform_negatives,\n config.inbatch_negatives,\n item_correction,\n for group_number in group_order:\n users = groups[int(group_number)]\n group_counts = target_counts[users]\n hidden = torch.zeros(\n 1, len(users), config.embedding_dim, device=device\n )\n max_targets = int(group_counts.max())\n for start in range(0, max_targets, config.bptt_steps):\n steps = min(config.bptt_steps, max_targets - start)\n block = build_dense_block(\n prepared,\n target_weights,\n users,\n window_starts[users],\n group_counts,\n np.zeros(len(users), dtype=np.int64),\n start,\n steps,\n config,\n )\n sequence_outputs, _ = event_sequence(\n model,\n torch.from_numpy(block[0].astype(np.int64)).to(device),\n torch.from_numpy(block[1].astype(np.float32)).to(device),\n hidden,\n )\n hidden = torch.stack(\n [\n sequence_outputs[row, count - 1]\n if count\n else hidden[0, row]\n for row, count in enumerate(block[7])\n ]\n ).unsqueeze(0).detach()\n flat_scored = block[5].reshape(-1)\n if not np.any(flat_scored):\n continue\n mask = torch.from_numpy(flat_scored).to(device)\n sequence_vectors = sequence_outputs.reshape(\n -1, config.embedding_dim\n )[mask]\n prepared,\n target_weights,\n users,\n window_starts[users],\n group_totals,\n group_starts,\n start,\n steps,\n config,\n )\n sequence_outputs, _ = event_sequence(\n model,\n torch.from_numpy(block[0].astype(np.int64)).to(device),\n torch.from_numpy(block[1].astype(np.float32)).to(device),\n hidden,\n )\n hidden = torch.stack(\n [\n sequence_outputs[row, count - 1]\n if count\n else hidden[0, row]\n for row, count in enumerate(block[7])\n ]\n ).unsqueeze(0)\n flat_scored = block[5].reshape(-1)\n if not np.any(flat_scored):\n continue\n mask = torch.from_numpy(flat_scored).to(device)\n sequence_vectors = sequence_outputs.reshape(\n -1, config.embedding_dim\n )[mask]\n flat_states = block[3].reshape(-1)[flat_scored]\n positive_items = torch.from_numpy(\n block[4].reshape(-1)[flat_scored].astype(np.int64)\n ).to(device)\n known_history = torch.from_numpy(\n block[6].reshape(-1, config.bptt_steps)[flat_scored].astype(\n np.int64\n )\n ).to(device)\n liked_items = torch.from_numpy(\n1271: negative_count = (\n2001: \"--hard-inbatch-pool\", type=int, default=Config.hard_inbatch_pool,\n", "exit_code": 0, "duration": { "secs": 0, "nanos": 3970 }, "formatted_output": " for column in range(1, negatives.shape[1]):\n invalid[:, column] |= (\n negatives[:, column, None] == negatives[:, :column]\n ).any(axis=1)\n return invalid\n\n\ndef draw_full_history_filtered_negatives(\n targets: torch.Tensor,\n user_rows: np.ndarray,\n liked_items: torch.Tensor,\n disliked_items: torch.Tensor,\n known_positive_packed: np.ndarray,\n n_items: int,\n config: Config,\n item_correction: torch.Tensor,\n generator: torch.Generator,\n device: torch.device,\n) -> tuple[torch.Tensor, torch.Tensor]:\n \"\"\"Draw mixed negatives and reject all known public-training positives.\"\"\"\n targets_cpu = targets.detach().cpu().numpy().astype(np.int64, copy=False)\n liked_cpu = liked_items.detach().cpu().numpy().astype(np.int64, copy=False)\n batch_size = len(targets_cpu)\n uniform = torch.randint(\n n_items,\n (batch_size, config.uniform_negatives),\n generator=generator,\n device=\"cpu\",\n )\n inbatch = torch.empty((batch_size, 0), dtype=torch.long)\n corrected_count = 0\n inbatch_draw_count = max(config.inbatch_negatives, config.hard_inbatch_pool)\n if inbatch_draw_count:\n unique_targets = torch.unique(targets.detach().cpu())\n corrected_count = min(\n inbatch_draw_count, max(len(unique_targets) - 1, 0)\n )\n if corrected_count:\n priorities = torch.rand(\n (batch_size, len(unique_targets)), generator=generator\n )\n priorities.masked_fill_(\n unique_targets[None, :].eq(\n torch.from_numpy(targets_cpu)[:, None]\n ),\n -1.0,\n )\n columns = torch.topk(\n priorities, k=corrected_count, dim=1\n ).indices\n inbatch = unique_targets[columns]\n if corrected_count < inbatch_draw_count:\n filler = torch.randint(\n n_items,\n (batch_size, inbatch_draw_count - corrected_count),\n generator=generator,\n device=\"cpu\",\n )\n inbatch = torch.cat([inbatch, filler], dim=1)\n\n explicit_dislikes = torch.empty((batch_size, 0), dtype=torch.long)\n if config.explicit_dislike_negatives:\n disliked_cpu = disliked_items.detach().cpu()\n priorities = torch.rand(disliked_cpu.shape, generator=generator)\n priorities.masked_fill_(disliked_cpu.eq(n_items), -1.0)\n columns = torch.topk(\n priorities, k=config.explicit_dislike_negatives, dim=1\n ).indices\n explicit_dislikes = disliked_cpu.gather(1, columns)\n missing = explicit_dislikes.eq(n_items)\n if bool(missing.any()):\n explicit_dislikes[missing] = torch.randint(\n n_items, (int(missing.sum()),), generator=generator\n )\n\n negatives = torch.cat([uniform, inbatch, explicit_dislikes], dim=1).numpy()\n correction = np.ones_like(negatives, dtype=np.float32)\n if corrected_count:\n correction[\n :, config.uniform_negatives : config.uniform_negatives + corrected_count\n ] = item_correction[inbatch[:, :corrected_count]].numpy()\n for _ in range(32):\n invalid = invalid_full_history_negatives(\n negatives,\n targets_cpu,\n user_rows,\n known_positive_packed,\n liked_cpu,\n )\n if not np.any(invalid):\n return (\n torch.from_numpy(negatives).to(device),\n torch.from_numpy(correction).to(device),\n )\n replacements = torch.randint(\n n_items,\n (int(invalid.sum()),),\n generator=generator,\n device=\"cpu\",\n ).numpy()\n negatives[invalid] = replacements\n # Rejected in-batch items become ordinary uniform draws.\n correction[invalid] = 1.0\n invalid = invalid_full_history_negatives(\n negatives,\n targets_cpu,\n user_rows,\n known_positive_packed,\n liked_cpu,\n )\n if np.any(invalid):\n raise RuntimeError(\"full-history negative resampling failed\")\n return (\n torch.from_numpy(negatives).to(device),\n torch.from_numpy(correction).to(device),\n )\n\n\ndef draw_training_negatives(\n positive_items: torch.Tensor,\n known_history: torch.Tensor,\n liked_items: torch.Tensor,\n disliked_items: torch.Tensor,\n user_rows: np.ndarray,\n known_positive_packed: np.ndarray | None,\n prepared: SequenceData,\n config: Config,\n item_correction: torch.Tensor,\n generator: torch.Generator,\n device: torch.device,\n) -> tuple[torch.Tensor, torch.Tensor]:\n if config.negative_filter_scope == \"full-training-history\":\n if known_positive_packed is None:\n raise RuntimeError(\"full-history negative filter was not built\")\n return draw_full_history_filtered_negatives(\n positive_items,\n user_rows,\n liked_items,\n disliked_items,\n known_positive_packed,\n len(prepared.item_ids),\n config,\n item_correction,\n generator,\n device,\n )\n if config.explicit_dislike_negatives:\n raise RuntimeError(\"explicit dislike negatives require full-history filtering\")\n return base.draw_filtered_mixed_negatives(\n positive_items,\n known_history,\n liked_items,\n len(prepared.item_ids),\n config.uniform_negatives,\n config.inbatch_negatives,\n item_correction,\n for group_number in group_order:\n users = groups[int(group_number)]\n group_counts = target_counts[users]\n hidden = torch.zeros(\n 1, len(users), config.embedding_dim, device=device\n )\n max_targets = int(group_counts.max())\n for start in range(0, max_targets, config.bptt_steps):\n steps = min(config.bptt_steps, max_targets - start)\n block = build_dense_block(\n prepared,\n target_weights,\n users,\n window_starts[users],\n group_counts,\n np.zeros(len(users), dtype=np.int64),\n start,\n steps,\n config,\n )\n sequence_outputs, _ = event_sequence(\n model,\n torch.from_numpy(block[0].astype(np.int64)).to(device),\n torch.from_numpy(block[1].astype(np.float32)).to(device),\n hidden,\n )\n hidden = torch.stack(\n [\n sequence_outputs[row, count - 1]\n if count\n else hidden[0, row]\n for row, count in enumerate(block[7])\n ]\n ).unsqueeze(0).detach()\n flat_scored = block[5].reshape(-1)\n if not np.any(flat_scored):\n continue\n mask = torch.from_numpy(flat_scored).to(device)\n sequence_vectors = sequence_outputs.reshape(\n -1, config.embedding_dim\n )[mask]\n prepared,\n target_weights,\n users,\n window_starts[users],\n group_totals,\n group_starts,\n start,\n steps,\n config,\n )\n sequence_outputs, _ = event_sequence(\n model,\n torch.from_numpy(block[0].astype(np.int64)).to(device),\n torch.from_numpy(block[1].astype(np.float32)).to(device),\n hidden,\n )\n hidden = torch.stack(\n [\n sequence_outputs[row, count - 1]\n if count\n else hidden[0, row]\n for row, count in enumerate(block[7])\n ]\n ).unsqueeze(0)\n flat_scored = block[5].reshape(-1)\n if not np.any(flat_scored):\n continue\n mask = torch.from_numpy(flat_scored).to(device)\n sequence_vectors = sequence_outputs.reshape(\n -1, config.embedding_dim\n )[mask]\n flat_states = block[3].reshape(-1)[flat_scored]\n positive_items = torch.from_numpy(\n block[4].reshape(-1)[flat_scored].astype(np.int64)\n ).to(device)\n known_history = torch.from_numpy(\n block[6].reshape(-1, config.bptt_steps)[flat_scored].astype(\n np.int64\n )\n ).to(device)\n liked_items = torch.from_numpy(\n1271: negative_count = (\n2001: \"--hard-inbatch-pool\", type=int, default=Config.hard_inbatch_pool,\n" } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44df9fe1087d2bd364409ede067c7", "usage": { "input_tokens": 66901, "cached_input_tokens": 66432, "cache_write_input_tokens": 0, "output_tokens": 144, "reasoning_output_tokens": 15, "total_tokens": 67045 }, "turn_token_usage": { "input_tokens": 3314638, "cached_input_tokens": 3198336, "cache_write_input_tokens": 0, "output_tokens": 13128, "reasoning_output_tokens": 4762, "total_tokens": 3327766 }, "thread_token_usage": { "input_tokens": 3314638, "cached_input_tokens": 3198336, "cache_write_input_tokens": 0, "output_tokens": 13128, "reasoning_output_tokens": 4762, "total_tokens": 3327766 } } ## Step 56 · agent · 2026-09-23T22:09:06.893Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:09:10.589Z { "code": "const r = await tools.exec_command({cmd:\"sed -n '1320,1375p' /app/solution/train_current_model.py; sed -n '1490,1545p' /app/solution/train_current_model.py; sed -n '875,935p' /app/solution/train_current_model.py; sed -n '1985,2080p' /app/solution/train_current_model.py\",\"workdir\":\"/app\",\"yield_time_ms\":10000,\"max_output_tokens\":14000}); text(r.output)\n" } ### Tool output · 2026-09-23T22:09:10.708Z Script completed Wall time 0.0 seconds Output: if not np.any(flat_scored): continue mask = torch.from_numpy(flat_scored).to(device) sequence_vectors = sequence_outputs.reshape( -1, config.embedding_dim )[mask] flat_states = block[3].reshape(-1)[flat_scored] positive_items = torch.from_numpy( block[4].reshape(-1)[flat_scored].astype(np.int64) ).to(device) known_history = torch.from_numpy( block[6].reshape(-1, config.bptt_steps)[flat_scored].astype( np.int64 ) ).to(device) liked_items = torch.from_numpy( prepared.liked_states[flat_states].astype(np.int64) ).to(device) disliked_items = torch.from_numpy( prepared.disliked_states[flat_states].astype(np.int64) ).to(device) flat_user_rows = np.broadcast_to( users[:, None], block[5].shape ).reshape(-1)[flat_scored] negatives, negative_weights = draw_training_negatives( positive_items, known_history, liked_items, disliked_items, flat_user_rows, known_positive_packed, prepared, config, item_correction, generator, device, ) optimizer.zero_grad(set_to_none=True) statistics, sequence_gradient = score_target_microbatches( model, prepared, config, sequence_vectors, flat_states, block[2].reshape(-1, 4)[flat_scored].astype(np.float32), positive_items, negatives, negative_weights, block[8].reshape(-1)[flat_scored], device, backward=True, ) if sequence_gradient is None: raise RuntimeError("training block omitted its sequence gradient") sequence_vectors.backward(sequence_gradient) nn.utils.clip_grad_norm_(model.parameters(), config.gradient_clip) known_history = torch.from_numpy( block[6].reshape(-1, config.bptt_steps)[flat_scored].astype( np.int64 ) ).to(device) liked_items = torch.from_numpy( prepared.liked_states[flat_states].astype(np.int64) ).to(device) disliked_items = torch.from_numpy( prepared.disliked_states[flat_states].astype(np.int64) ).to(device) flat_user_rows = np.broadcast_to( users[:, None], block[5].shape ).reshape(-1)[flat_scored] negatives, negative_weights = draw_training_negatives( positive_items, known_history, liked_items, disliked_items, flat_user_rows, known_positive_packed, prepared, config, item_correction, generator, device, ) statistics, _ = score_target_microbatches( model, prepared, config, sequence_vectors, flat_states, block[2].reshape(-1, 4)[flat_scored].astype(np.float32), positive_items, negatives, negative_weights, block[8].reshape(-1)[flat_scored], device, backward=False, ) total_loss += statistics["loss_sum"] total_targets += len(positive_items) total_weight += statistics["weight_sum"] if group_number % 25 == 0: release_accelerator_cache(device) return { "validation_loss": total_loss / max(total_weight, 1.0e-12), "validation_targets": float(total_targets), "validation_target_weight_sum": total_weight, "validation_seconds": time.monotonic() - started, } def snapshot_model(model: nn.Module) -> dict[str, torch.Tensor]: return { config.uniform_negatives + config.inbatch_negatives + config.explicit_dislike_negatives ) result = torch.zeros(len(logits), device=logits.device) if config.uniform_negatives: result += config.uniform_negatives * raw[ :, : config.uniform_negatives ].mean(dim=1) if config.inbatch_negatives: pool_start = config.uniform_negatives pool_size = logits.shape[1] - pool_start if config.hard_inbatch_pool: if pool_size < config.inbatch_negatives: raise RuntimeError("hard-negative proposal pool is too small") columns = torch.topk( logits[:, pool_start:], k=config.inbatch_negatives, dim=1 ).indices selected_raw = raw[:, pool_start:].gather(1, columns) weights = correction[:, pool_start:].gather(1, columns) else: selected = slice(pool_start, total) selected_raw = raw[:, selected] weights = correction[:, selected] result += config.inbatch_negatives * ( (selected_raw * weights).sum(dim=1) / weights.sum(dim=1).clamp_min(1.0e-6) ) if config.explicit_dislike_negatives: pool_size = max(config.inbatch_negatives, config.hard_inbatch_pool) start = config.uniform_negatives + pool_size selected = raw[:, start : start + config.explicit_dislike_negatives] result += config.explicit_dislike_negatives * selected.mean(dim=1) return result / total def retained_target_window_starts( total_targets: np.ndarray, validation_counts: np.ndarray, training_counts: np.ndarray, ) -> np.ndarray: """Return the discarded prefix before the retained chronological suffix.""" training_region_ends = total_targets - validation_counts window_starts = training_region_ends - training_counts if ( np.any(window_starts < 0) or np.any(training_counts < 0) or np.any(validation_counts < 0) ): raise RuntimeError("chronological target partition produced negative counts") if not np.array_equal( window_starts + training_counts + validation_counts, total_targets ): raise RuntimeError("chronological target window is not a final contiguous suffix") return window_starts def chronological_target_partition( prepared: SequenceData, validation_fraction: float, max_train_targets_per_user: int, parser.add_argument("--prepared-cache", type=Path) parser.add_argument("--device", choices=("cpu", "mps"), default="cpu") parser.add_argument("--threads", type=int, default=8) parser.add_argument("--bptt-steps", type=int, default=Config.bptt_steps) parser.add_argument( "--user-batch-size", type=int, default=Config.user_batch_size ) parser.add_argument("--epochs", type=int, default=Config.epochs) parser.add_argument("--learning-rate", type=float, default=Config.learning_rate) parser.add_argument( "--uniform-negatives", type=int, default=Config.uniform_negatives ) parser.add_argument( "--inbatch-negatives", type=int, default=Config.inbatch_negatives ) parser.add_argument( "--hard-inbatch-pool", type=int, default=Config.hard_inbatch_pool, help="draw this many in-batch proposals and train on the highest-scoring subset", ) parser.add_argument( "--inbatch-correction-power", type=float, default=Config.inbatch_correction_power, ) parser.add_argument( "--loss-microbatch-size", type=int, default=Config.loss_microbatch_size, ) parser.add_argument( "--negative-filter-scope", choices=("full-training-history", "last-100"), default=Config.negative_filter_scope, ) parser.add_argument( "--target-weighting", choices=("discovery-graded", "organic-strong", "uniform"), default=Config.target_weighting, ) parser.add_argument( "--ordinary-target-weight", type=float, default=Config.ordinary_target_weight, ) parser.add_argument( "--organic-strong-target-weight", type=float, default=Config.organic_strong_target_weight, ) parser.add_argument( "--organic-like-target-weight", type=float, default=Config.organic_like_target_weight, ) parser.add_argument( "--discovery-horizon-days", type=int, default=Config.discovery_horizon_days, ) parser.add_argument( "--validation-fraction", type=float, default=Config.validation_fraction, ) parser.add_argument( "--max-train-targets-per-user", type=int, default=Config.max_train_targets_per_user, help="retain this many recent pre-validation targets per user; 0 is uncapped", ) parser.add_argument( "--max-validation-targets-per-user", type=int, default=Config.max_validation_targets_per_user, help="retain this many final validation targets per user; 0 is uncapped", ) parser.add_argument( "--early-stopping-patience", type=int, default=Config.early_stopping_patience, ) parser.add_argument( "--early-stopping-min-delta", type=float, default=Config.early_stopping_min_delta, ) parser.add_argument("--checkpoint-dir", type=Path) parser.add_argument("--resume-checkpoint", type=Path) parser.add_argument("--seed", type=int, default=Config.seed) parser.add_argument("--ranking-batch-size", type=int, default=64) parser.add_argument("--prepare-only", action="store_true") args = parser.parse_args() if args.threads < 1 or args.bptt_steps < 2 or args.user_batch_size < 1: parser.error("threads, BPTT steps, and user batch size must be positive") if ( ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-f64bdf82-7e74-49b8-bf7c-9cad10b22bef", "process_id": "23144", "command": [ "/bin/sh", "-lc", "sed -n '1320,1375p' /app/solution/train_current_model.py; sed -n '1490,1545p' /app/solution/train_current_model.py; sed -n '875,935p' /app/solution/train_current_model.py; sed -n '1985,2080p' /app/solution/train_current_model.py" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "read", "cmd": "sed -n '1320,1375p' /app/solution/train_current_model.py", "name": "train_current_model.py", "path": "/app/solution/train_current_model.py" }, { "type": "read", "cmd": "sed -n '1490,1545p' /app/solution/train_current_model.py", "name": "train_current_model.py", "path": "/app/solution/train_current_model.py" }, { "type": "read", "cmd": "sed -n '875,935p' /app/solution/train_current_model.py", "name": "train_current_model.py", "path": "/app/solution/train_current_model.py" }, { "type": "read", "cmd": "sed -n '1985,2080p' /app/solution/train_current_model.py", "name": "train_current_model.py", "path": "/app/solution/train_current_model.py" } ], "source": "unified_exec_startup", "status": "completed", "stdout": " if not np.any(flat_scored):\n continue\n mask = torch.from_numpy(flat_scored).to(device)\n sequence_vectors = sequence_outputs.reshape(\n -1, config.embedding_dim\n )[mask]\n flat_states = block[3].reshape(-1)[flat_scored]\n positive_items = torch.from_numpy(\n block[4].reshape(-1)[flat_scored].astype(np.int64)\n ).to(device)\n known_history = torch.from_numpy(\n block[6].reshape(-1, config.bptt_steps)[flat_scored].astype(\n np.int64\n )\n ).to(device)\n liked_items = torch.from_numpy(\n prepared.liked_states[flat_states].astype(np.int64)\n ).to(device)\n disliked_items = torch.from_numpy(\n prepared.disliked_states[flat_states].astype(np.int64)\n ).to(device)\n flat_user_rows = np.broadcast_to(\n users[:, None], block[5].shape\n ).reshape(-1)[flat_scored]\n negatives, negative_weights = draw_training_negatives(\n positive_items,\n known_history,\n liked_items,\n disliked_items,\n flat_user_rows,\n known_positive_packed,\n prepared,\n config,\n item_correction,\n generator,\n device,\n )\n optimizer.zero_grad(set_to_none=True)\n statistics, sequence_gradient = score_target_microbatches(\n model,\n prepared,\n config,\n sequence_vectors,\n flat_states,\n block[2].reshape(-1, 4)[flat_scored].astype(np.float32),\n positive_items,\n negatives,\n negative_weights,\n block[8].reshape(-1)[flat_scored],\n device,\n backward=True,\n )\n if sequence_gradient is None:\n raise RuntimeError(\"training block omitted its sequence gradient\")\n sequence_vectors.backward(sequence_gradient)\n nn.utils.clip_grad_norm_(model.parameters(), config.gradient_clip)\n known_history = torch.from_numpy(\n block[6].reshape(-1, config.bptt_steps)[flat_scored].astype(\n np.int64\n )\n ).to(device)\n liked_items = torch.from_numpy(\n prepared.liked_states[flat_states].astype(np.int64)\n ).to(device)\n disliked_items = torch.from_numpy(\n prepared.disliked_states[flat_states].astype(np.int64)\n ).to(device)\n flat_user_rows = np.broadcast_to(\n users[:, None], block[5].shape\n ).reshape(-1)[flat_scored]\n negatives, negative_weights = draw_training_negatives(\n positive_items,\n known_history,\n liked_items,\n disliked_items,\n flat_user_rows,\n known_positive_packed,\n prepared,\n config,\n item_correction,\n generator,\n device,\n )\n statistics, _ = score_target_microbatches(\n model,\n prepared,\n config,\n sequence_vectors,\n flat_states,\n block[2].reshape(-1, 4)[flat_scored].astype(np.float32),\n positive_items,\n negatives,\n negative_weights,\n block[8].reshape(-1)[flat_scored],\n device,\n backward=False,\n )\n total_loss += statistics[\"loss_sum\"]\n total_targets += len(positive_items)\n total_weight += statistics[\"weight_sum\"]\n if group_number % 25 == 0:\n release_accelerator_cache(device)\n return {\n \"validation_loss\": total_loss / max(total_weight, 1.0e-12),\n \"validation_targets\": float(total_targets),\n \"validation_target_weight_sum\": total_weight,\n \"validation_seconds\": time.monotonic() - started,\n }\n\n\ndef snapshot_model(model: nn.Module) -> dict[str, torch.Tensor]:\n return {\n config.uniform_negatives\n + config.inbatch_negatives\n + config.explicit_dislike_negatives\n )\n result = torch.zeros(len(logits), device=logits.device)\n if config.uniform_negatives:\n result += config.uniform_negatives * raw[\n :, : config.uniform_negatives\n ].mean(dim=1)\n if config.inbatch_negatives:\n pool_start = config.uniform_negatives\n pool_size = logits.shape[1] - pool_start\n if config.hard_inbatch_pool:\n if pool_size < config.inbatch_negatives:\n raise RuntimeError(\"hard-negative proposal pool is too small\")\n columns = torch.topk(\n logits[:, pool_start:], k=config.inbatch_negatives, dim=1\n ).indices\n selected_raw = raw[:, pool_start:].gather(1, columns)\n weights = correction[:, pool_start:].gather(1, columns)\n else:\n selected = slice(pool_start, total)\n selected_raw = raw[:, selected]\n weights = correction[:, selected]\n result += config.inbatch_negatives * (\n (selected_raw * weights).sum(dim=1)\n / weights.sum(dim=1).clamp_min(1.0e-6)\n )\n if config.explicit_dislike_negatives:\n pool_size = max(config.inbatch_negatives, config.hard_inbatch_pool)\n start = config.uniform_negatives + pool_size\n selected = raw[:, start : start + config.explicit_dislike_negatives]\n result += config.explicit_dislike_negatives * selected.mean(dim=1)\n return result / total\n\n\ndef retained_target_window_starts(\n total_targets: np.ndarray,\n validation_counts: np.ndarray,\n training_counts: np.ndarray,\n) -> np.ndarray:\n \"\"\"Return the discarded prefix before the retained chronological suffix.\"\"\"\n training_region_ends = total_targets - validation_counts\n window_starts = training_region_ends - training_counts\n if (\n np.any(window_starts < 0)\n or np.any(training_counts < 0)\n or np.any(validation_counts < 0)\n ):\n raise RuntimeError(\"chronological target partition produced negative counts\")\n if not np.array_equal(\n window_starts + training_counts + validation_counts, total_targets\n ):\n raise RuntimeError(\"chronological target window is not a final contiguous suffix\")\n return window_starts\n\n\ndef chronological_target_partition(\n prepared: SequenceData,\n validation_fraction: float,\n max_train_targets_per_user: int,\n parser.add_argument(\"--prepared-cache\", type=Path)\n parser.add_argument(\"--device\", choices=(\"cpu\", \"mps\"), default=\"cpu\")\n parser.add_argument(\"--threads\", type=int, default=8)\n parser.add_argument(\"--bptt-steps\", type=int, default=Config.bptt_steps)\n parser.add_argument(\n \"--user-batch-size\", type=int, default=Config.user_batch_size\n )\n parser.add_argument(\"--epochs\", type=int, default=Config.epochs)\n parser.add_argument(\"--learning-rate\", type=float, default=Config.learning_rate)\n parser.add_argument(\n \"--uniform-negatives\", type=int, default=Config.uniform_negatives\n )\n parser.add_argument(\n \"--inbatch-negatives\", type=int, default=Config.inbatch_negatives\n )\n parser.add_argument(\n \"--hard-inbatch-pool\", type=int, default=Config.hard_inbatch_pool,\n help=\"draw this many in-batch proposals and train on the highest-scoring subset\",\n )\n parser.add_argument(\n \"--inbatch-correction-power\",\n type=float,\n default=Config.inbatch_correction_power,\n )\n parser.add_argument(\n \"--loss-microbatch-size\",\n type=int,\n default=Config.loss_microbatch_size,\n )\n parser.add_argument(\n \"--negative-filter-scope\",\n choices=(\"full-training-history\", \"last-100\"),\n default=Config.negative_filter_scope,\n )\n parser.add_argument(\n \"--target-weighting\",\n choices=(\"discovery-graded\", \"organic-strong\", \"uniform\"),\n default=Config.target_weighting,\n )\n parser.add_argument(\n \"--ordinary-target-weight\",\n type=float,\n default=Config.ordinary_target_weight,\n )\n parser.add_argument(\n \"--organic-strong-target-weight\",\n type=float,\n default=Config.organic_strong_target_weight,\n )\n parser.add_argument(\n \"--organic-like-target-weight\",\n type=float,\n default=Config.organic_like_target_weight,\n )\n parser.add_argument(\n \"--discovery-horizon-days\",\n type=int,\n default=Config.discovery_horizon_days,\n )\n parser.add_argument(\n \"--validation-fraction\",\n type=float,\n default=Config.validation_fraction,\n )\n parser.add_argument(\n \"--max-train-targets-per-user\",\n type=int,\n default=Config.max_train_targets_per_user,\n help=\"retain this many recent pre-validation targets per user; 0 is uncapped\",\n )\n parser.add_argument(\n \"--max-validation-targets-per-user\",\n type=int,\n default=Config.max_validation_targets_per_user,\n help=\"retain this many final validation targets per user; 0 is uncapped\",\n )\n parser.add_argument(\n \"--early-stopping-patience\",\n type=int,\n default=Config.early_stopping_patience,\n )\n parser.add_argument(\n \"--early-stopping-min-delta\",\n type=float,\n default=Config.early_stopping_min_delta,\n )\n parser.add_argument(\"--checkpoint-dir\", type=Path)\n parser.add_argument(\"--resume-checkpoint\", type=Path)\n parser.add_argument(\"--seed\", type=int, default=Config.seed)\n parser.add_argument(\"--ranking-batch-size\", type=int, default=64)\n parser.add_argument(\"--prepare-only\", action=\"store_true\")\n args = parser.parse_args()\n\n if args.threads < 1 or args.bptt_steps < 2 or args.user_batch_size < 1:\n parser.error(\"threads, BPTT steps, and user batch size must be positive\")\n if (\n", "stderr": "", "aggregated_output": " if not np.any(flat_scored):\n continue\n mask = torch.from_numpy(flat_scored).to(device)\n sequence_vectors = sequence_outputs.reshape(\n -1, config.embedding_dim\n )[mask]\n flat_states = block[3].reshape(-1)[flat_scored]\n positive_items = torch.from_numpy(\n block[4].reshape(-1)[flat_scored].astype(np.int64)\n ).to(device)\n known_history = torch.from_numpy(\n block[6].reshape(-1, config.bptt_steps)[flat_scored].astype(\n np.int64\n )\n ).to(device)\n liked_items = torch.from_numpy(\n prepared.liked_states[flat_states].astype(np.int64)\n ).to(device)\n disliked_items = torch.from_numpy(\n prepared.disliked_states[flat_states].astype(np.int64)\n ).to(device)\n flat_user_rows = np.broadcast_to(\n users[:, None], block[5].shape\n ).reshape(-1)[flat_scored]\n negatives, negative_weights = draw_training_negatives(\n positive_items,\n known_history,\n liked_items,\n disliked_items,\n flat_user_rows,\n known_positive_packed,\n prepared,\n config,\n item_correction,\n generator,\n device,\n )\n optimizer.zero_grad(set_to_none=True)\n statistics, sequence_gradient = score_target_microbatches(\n model,\n prepared,\n config,\n sequence_vectors,\n flat_states,\n block[2].reshape(-1, 4)[flat_scored].astype(np.float32),\n positive_items,\n negatives,\n negative_weights,\n block[8].reshape(-1)[flat_scored],\n device,\n backward=True,\n )\n if sequence_gradient is None:\n raise RuntimeError(\"training block omitted its sequence gradient\")\n sequence_vectors.backward(sequence_gradient)\n nn.utils.clip_grad_norm_(model.parameters(), config.gradient_clip)\n known_history = torch.from_numpy(\n block[6].reshape(-1, config.bptt_steps)[flat_scored].astype(\n np.int64\n )\n ).to(device)\n liked_items = torch.from_numpy(\n prepared.liked_states[flat_states].astype(np.int64)\n ).to(device)\n disliked_items = torch.from_numpy(\n prepared.disliked_states[flat_states].astype(np.int64)\n ).to(device)\n flat_user_rows = np.broadcast_to(\n users[:, None], block[5].shape\n ).reshape(-1)[flat_scored]\n negatives, negative_weights = draw_training_negatives(\n positive_items,\n known_history,\n liked_items,\n disliked_items,\n flat_user_rows,\n known_positive_packed,\n prepared,\n config,\n item_correction,\n generator,\n device,\n )\n statistics, _ = score_target_microbatches(\n model,\n prepared,\n config,\n sequence_vectors,\n flat_states,\n block[2].reshape(-1, 4)[flat_scored].astype(np.float32),\n positive_items,\n negatives,\n negative_weights,\n block[8].reshape(-1)[flat_scored],\n device,\n backward=False,\n )\n total_loss += statistics[\"loss_sum\"]\n total_targets += len(positive_items)\n total_weight += statistics[\"weight_sum\"]\n if group_number % 25 == 0:\n release_accelerator_cache(device)\n return {\n \"validation_loss\": total_loss / max(total_weight, 1.0e-12),\n \"validation_targets\": float(total_targets),\n \"validation_target_weight_sum\": total_weight,\n \"validation_seconds\": time.monotonic() - started,\n }\n\n\ndef snapshot_model(model: nn.Module) -> dict[str, torch.Tensor]:\n return {\n config.uniform_negatives\n + config.inbatch_negatives\n + config.explicit_dislike_negatives\n )\n result = torch.zeros(len(logits), device=logits.device)\n if config.uniform_negatives:\n result += config.uniform_negatives * raw[\n :, : config.uniform_negatives\n ].mean(dim=1)\n if config.inbatch_negatives:\n pool_start = config.uniform_negatives\n pool_size = logits.shape[1] - pool_start\n if config.hard_inbatch_pool:\n if pool_size < config.inbatch_negatives:\n raise RuntimeError(\"hard-negative proposal pool is too small\")\n columns = torch.topk(\n logits[:, pool_start:], k=config.inbatch_negatives, dim=1\n ).indices\n selected_raw = raw[:, pool_start:].gather(1, columns)\n weights = correction[:, pool_start:].gather(1, columns)\n else:\n selected = slice(pool_start, total)\n selected_raw = raw[:, selected]\n weights = correction[:, selected]\n result += config.inbatch_negatives * (\n (selected_raw * weights).sum(dim=1)\n / weights.sum(dim=1).clamp_min(1.0e-6)\n )\n if config.explicit_dislike_negatives:\n pool_size = max(config.inbatch_negatives, config.hard_inbatch_pool)\n start = config.uniform_negatives + pool_size\n selected = raw[:, start : start + config.explicit_dislike_negatives]\n result += config.explicit_dislike_negatives * selected.mean(dim=1)\n return result / total\n\n\ndef retained_target_window_starts(\n total_targets: np.ndarray,\n validation_counts: np.ndarray,\n training_counts: np.ndarray,\n) -> np.ndarray:\n \"\"\"Return the discarded prefix before the retained chronological suffix.\"\"\"\n training_region_ends = total_targets - validation_counts\n window_starts = training_region_ends - training_counts\n if (\n np.any(window_starts < 0)\n or np.any(training_counts < 0)\n or np.any(validation_counts < 0)\n ):\n raise RuntimeError(\"chronological target partition produced negative counts\")\n if not np.array_equal(\n window_starts + training_counts + validation_counts, total_targets\n ):\n raise RuntimeError(\"chronological target window is not a final contiguous suffix\")\n return window_starts\n\n\ndef chronological_target_partition(\n prepared: SequenceData,\n validation_fraction: float,\n max_train_targets_per_user: int,\n parser.add_argument(\"--prepared-cache\", type=Path)\n parser.add_argument(\"--device\", choices=(\"cpu\", \"mps\"), default=\"cpu\")\n parser.add_argument(\"--threads\", type=int, default=8)\n parser.add_argument(\"--bptt-steps\", type=int, default=Config.bptt_steps)\n parser.add_argument(\n \"--user-batch-size\", type=int, default=Config.user_batch_size\n )\n parser.add_argument(\"--epochs\", type=int, default=Config.epochs)\n parser.add_argument(\"--learning-rate\", type=float, default=Config.learning_rate)\n parser.add_argument(\n \"--uniform-negatives\", type=int, default=Config.uniform_negatives\n )\n parser.add_argument(\n \"--inbatch-negatives\", type=int, default=Config.inbatch_negatives\n )\n parser.add_argument(\n \"--hard-inbatch-pool\", type=int, default=Config.hard_inbatch_pool,\n help=\"draw this many in-batch proposals and train on the highest-scoring subset\",\n )\n parser.add_argument(\n \"--inbatch-correction-power\",\n type=float,\n default=Config.inbatch_correction_power,\n )\n parser.add_argument(\n \"--loss-microbatch-size\",\n type=int,\n default=Config.loss_microbatch_size,\n )\n parser.add_argument(\n \"--negative-filter-scope\",\n choices=(\"full-training-history\", \"last-100\"),\n default=Config.negative_filter_scope,\n )\n parser.add_argument(\n \"--target-weighting\",\n choices=(\"discovery-graded\", \"organic-strong\", \"uniform\"),\n default=Config.target_weighting,\n )\n parser.add_argument(\n \"--ordinary-target-weight\",\n type=float,\n default=Config.ordinary_target_weight,\n )\n parser.add_argument(\n \"--organic-strong-target-weight\",\n type=float,\n default=Config.organic_strong_target_weight,\n )\n parser.add_argument(\n \"--organic-like-target-weight\",\n type=float,\n default=Config.organic_like_target_weight,\n )\n parser.add_argument(\n \"--discovery-horizon-days\",\n type=int,\n default=Config.discovery_horizon_days,\n )\n parser.add_argument(\n \"--validation-fraction\",\n type=float,\n default=Config.validation_fraction,\n )\n parser.add_argument(\n \"--max-train-targets-per-user\",\n type=int,\n default=Config.max_train_targets_per_user,\n help=\"retain this many recent pre-validation targets per user; 0 is uncapped\",\n )\n parser.add_argument(\n \"--max-validation-targets-per-user\",\n type=int,\n default=Config.max_validation_targets_per_user,\n help=\"retain this many final validation targets per user; 0 is uncapped\",\n )\n parser.add_argument(\n \"--early-stopping-patience\",\n type=int,\n default=Config.early_stopping_patience,\n )\n parser.add_argument(\n \"--early-stopping-min-delta\",\n type=float,\n default=Config.early_stopping_min_delta,\n )\n parser.add_argument(\"--checkpoint-dir\", type=Path)\n parser.add_argument(\"--resume-checkpoint\", type=Path)\n parser.add_argument(\"--seed\", type=int, default=Config.seed)\n parser.add_argument(\"--ranking-batch-size\", type=int, default=64)\n parser.add_argument(\"--prepare-only\", action=\"store_true\")\n args = parser.parse_args()\n\n if args.threads < 1 or args.bptt_steps < 2 or args.user_batch_size < 1:\n parser.error(\"threads, BPTT steps, and user batch size must be positive\")\n if (\n", "exit_code": 0, "duration": { "secs": 0, "nanos": 3300 }, "formatted_output": " if not np.any(flat_scored):\n continue\n mask = torch.from_numpy(flat_scored).to(device)\n sequence_vectors = sequence_outputs.reshape(\n -1, config.embedding_dim\n )[mask]\n flat_states = block[3].reshape(-1)[flat_scored]\n positive_items = torch.from_numpy(\n block[4].reshape(-1)[flat_scored].astype(np.int64)\n ).to(device)\n known_history = torch.from_numpy(\n block[6].reshape(-1, config.bptt_steps)[flat_scored].astype(\n np.int64\n )\n ).to(device)\n liked_items = torch.from_numpy(\n prepared.liked_states[flat_states].astype(np.int64)\n ).to(device)\n disliked_items = torch.from_numpy(\n prepared.disliked_states[flat_states].astype(np.int64)\n ).to(device)\n flat_user_rows = np.broadcast_to(\n users[:, None], block[5].shape\n ).reshape(-1)[flat_scored]\n negatives, negative_weights = draw_training_negatives(\n positive_items,\n known_history,\n liked_items,\n disliked_items,\n flat_user_rows,\n known_positive_packed,\n prepared,\n config,\n item_correction,\n generator,\n device,\n )\n optimizer.zero_grad(set_to_none=True)\n statistics, sequence_gradient = score_target_microbatches(\n model,\n prepared,\n config,\n sequence_vectors,\n flat_states,\n block[2].reshape(-1, 4)[flat_scored].astype(np.float32),\n positive_items,\n negatives,\n negative_weights,\n block[8].reshape(-1)[flat_scored],\n device,\n backward=True,\n )\n if sequence_gradient is None:\n raise RuntimeError(\"training block omitted its sequence gradient\")\n sequence_vectors.backward(sequence_gradient)\n nn.utils.clip_grad_norm_(model.parameters(), config.gradient_clip)\n known_history = torch.from_numpy(\n block[6].reshape(-1, config.bptt_steps)[flat_scored].astype(\n np.int64\n )\n ).to(device)\n liked_items = torch.from_numpy(\n prepared.liked_states[flat_states].astype(np.int64)\n ).to(device)\n disliked_items = torch.from_numpy(\n prepared.disliked_states[flat_states].astype(np.int64)\n ).to(device)\n flat_user_rows = np.broadcast_to(\n users[:, None], block[5].shape\n ).reshape(-1)[flat_scored]\n negatives, negative_weights = draw_training_negatives(\n positive_items,\n known_history,\n liked_items,\n disliked_items,\n flat_user_rows,\n known_positive_packed,\n prepared,\n config,\n item_correction,\n generator,\n device,\n )\n statistics, _ = score_target_microbatches(\n model,\n prepared,\n config,\n sequence_vectors,\n flat_states,\n block[2].reshape(-1, 4)[flat_scored].astype(np.float32),\n positive_items,\n negatives,\n negative_weights,\n block[8].reshape(-1)[flat_scored],\n device,\n backward=False,\n )\n total_loss += statistics[\"loss_sum\"]\n total_targets += len(positive_items)\n total_weight += statistics[\"weight_sum\"]\n if group_number % 25 == 0:\n release_accelerator_cache(device)\n return {\n \"validation_loss\": total_loss / max(total_weight, 1.0e-12),\n \"validation_targets\": float(total_targets),\n \"validation_target_weight_sum\": total_weight,\n \"validation_seconds\": time.monotonic() - started,\n }\n\n\ndef snapshot_model(model: nn.Module) -> dict[str, torch.Tensor]:\n return {\n config.uniform_negatives\n + config.inbatch_negatives\n + config.explicit_dislike_negatives\n )\n result = torch.zeros(len(logits), device=logits.device)\n if config.uniform_negatives:\n result += config.uniform_negatives * raw[\n :, : config.uniform_negatives\n ].mean(dim=1)\n if config.inbatch_negatives:\n pool_start = config.uniform_negatives\n pool_size = logits.shape[1] - pool_start\n if config.hard_inbatch_pool:\n if pool_size < config.inbatch_negatives:\n raise RuntimeError(\"hard-negative proposal pool is too small\")\n columns = torch.topk(\n logits[:, pool_start:], k=config.inbatch_negatives, dim=1\n ).indices\n selected_raw = raw[:, pool_start:].gather(1, columns)\n weights = correction[:, pool_start:].gather(1, columns)\n else:\n selected = slice(pool_start, total)\n selected_raw = raw[:, selected]\n weights = correction[:, selected]\n result += config.inbatch_negatives * (\n (selected_raw * weights).sum(dim=1)\n / weights.sum(dim=1).clamp_min(1.0e-6)\n )\n if config.explicit_dislike_negatives:\n pool_size = max(config.inbatch_negatives, config.hard_inbatch_pool)\n start = config.uniform_negatives + pool_size\n selected = raw[:, start : start + config.explicit_dislike_negatives]\n result += config.explicit_dislike_negatives * selected.mean(dim=1)\n return result / total\n\n\ndef retained_target_window_starts(\n total_targets: np.ndarray,\n validation_counts: np.ndarray,\n training_counts: np.ndarray,\n) -> np.ndarray:\n \"\"\"Return the discarded prefix before the retained chronological suffix.\"\"\"\n training_region_ends = total_targets - validation_counts\n window_starts = training_region_ends - training_counts\n if (\n np.any(window_starts < 0)\n or np.any(training_counts < 0)\n or np.any(validation_counts < 0)\n ):\n raise RuntimeError(\"chronological target partition produced negative counts\")\n if not np.array_equal(\n window_starts + training_counts + validation_counts, total_targets\n ):\n raise RuntimeError(\"chronological target window is not a final contiguous suffix\")\n return window_starts\n\n\ndef chronological_target_partition(\n prepared: SequenceData,\n validation_fraction: float,\n max_train_targets_per_user: int,\n parser.add_argument(\"--prepared-cache\", type=Path)\n parser.add_argument(\"--device\", choices=(\"cpu\", \"mps\"), default=\"cpu\")\n parser.add_argument(\"--threads\", type=int, default=8)\n parser.add_argument(\"--bptt-steps\", type=int, default=Config.bptt_steps)\n parser.add_argument(\n \"--user-batch-size\", type=int, default=Config.user_batch_size\n )\n parser.add_argument(\"--epochs\", type=int, default=Config.epochs)\n parser.add_argument(\"--learning-rate\", type=float, default=Config.learning_rate)\n parser.add_argument(\n \"--uniform-negatives\", type=int, default=Config.uniform_negatives\n )\n parser.add_argument(\n \"--inbatch-negatives\", type=int, default=Config.inbatch_negatives\n )\n parser.add_argument(\n \"--hard-inbatch-pool\", type=int, default=Config.hard_inbatch_pool,\n help=\"draw this many in-batch proposals and train on the highest-scoring subset\",\n )\n parser.add_argument(\n \"--inbatch-correction-power\",\n type=float,\n default=Config.inbatch_correction_power,\n )\n parser.add_argument(\n \"--loss-microbatch-size\",\n type=int,\n default=Config.loss_microbatch_size,\n )\n parser.add_argument(\n \"--negative-filter-scope\",\n choices=(\"full-training-history\", \"last-100\"),\n default=Config.negative_filter_scope,\n )\n parser.add_argument(\n \"--target-weighting\",\n choices=(\"discovery-graded\", \"organic-strong\", \"uniform\"),\n default=Config.target_weighting,\n )\n parser.add_argument(\n \"--ordinary-target-weight\",\n type=float,\n default=Config.ordinary_target_weight,\n )\n parser.add_argument(\n \"--organic-strong-target-weight\",\n type=float,\n default=Config.organic_strong_target_weight,\n )\n parser.add_argument(\n \"--organic-like-target-weight\",\n type=float,\n default=Config.organic_like_target_weight,\n )\n parser.add_argument(\n \"--discovery-horizon-days\",\n type=int,\n default=Config.discovery_horizon_days,\n )\n parser.add_argument(\n \"--validation-fraction\",\n type=float,\n default=Config.validation_fraction,\n )\n parser.add_argument(\n \"--max-train-targets-per-user\",\n type=int,\n default=Config.max_train_targets_per_user,\n help=\"retain this many recent pre-validation targets per user; 0 is uncapped\",\n )\n parser.add_argument(\n \"--max-validation-targets-per-user\",\n type=int,\n default=Config.max_validation_targets_per_user,\n help=\"retain this many final validation targets per user; 0 is uncapped\",\n )\n parser.add_argument(\n \"--early-stopping-patience\",\n type=int,\n default=Config.early_stopping_patience,\n )\n parser.add_argument(\n \"--early-stopping-min-delta\",\n type=float,\n default=Config.early_stopping_min_delta,\n )\n parser.add_argument(\"--checkpoint-dir\", type=Path)\n parser.add_argument(\"--resume-checkpoint\", type=Path)\n parser.add_argument(\"--seed\", type=int, default=Config.seed)\n parser.add_argument(\"--ranking-batch-size\", type=int, default=64)\n parser.add_argument(\"--prepare-only\", action=\"store_true\")\n args = parser.parse_args()\n\n if args.threads < 1 or args.bptt_steps < 2 or args.user_batch_size < 1:\n parser.error(\"threads, BPTT steps, and user batch size must be positive\")\n if (\n" } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44e0126c087d2a70dd15953ae702d", "usage": { "input_tokens": 68856, "cached_input_tokens": 61184, "cache_write_input_tokens": 0, "output_tokens": 135, "reasoning_output_tokens": 11, "total_tokens": 68991 }, "turn_token_usage": { "input_tokens": 3383494, "cached_input_tokens": 3259520, "cache_write_input_tokens": 0, "output_tokens": 13263, "reasoning_output_tokens": 4773, "total_tokens": 3396757 }, "thread_token_usage": { "input_tokens": 3383494, "cached_input_tokens": 3259520, "cache_write_input_tokens": 0, "output_tokens": 13263, "reasoning_output_tokens": 4773, "total_tokens": 3396757 } } ## Step 57 · agent · 2026-09-23T22:09:14.926Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:09:23.754Z { "code": "const patch = \"*** Begin Patch\\n*** Update File: /app/solution/train_current_model.py\\n@@\\n parser.add_argument(\\n \\\"--hard-inbatch-pool\\\", type=int, default=Config.hard_inbatch_pool,\\n help=\\\"draw this many in-batch proposals and train on the highest-scoring subset\\\",\\n )\\n+ parser.add_argument(\\n+ \\\"--explicit-dislike-negatives\\\",\\n+ type=int,\\n+ default=Config.explicit_dislike_negatives,\\n+ help=\\\"sample active explicit dislikes as user-specific negatives\\\",\\n+ )\\n@@\\n or args.inbatch_negatives < 0\\n- or args.uniform_negatives + args.inbatch_negatives < 1\\n+ or args.explicit_dislike_negatives < 0\\n+ or args.explicit_dislike_negatives > base.DISLIKE_ITEMS\\n+ or args.uniform_negatives + args.inbatch_negatives + args.explicit_dislike_negatives < 1\\n@@\\n inbatch_negatives=args.inbatch_negatives,\\n hard_inbatch_pool=args.hard_inbatch_pool,\\n+ explicit_dislike_negatives=args.explicit_dislike_negatives,\\n*** End Patch\";\ntext(await tools.apply_patch(patch));\n" } ### Tool output · 2026-09-23T22:09:23.854Z Script completed Wall time 0.0 seconds Output: {} ### Harness context { "type": "codex_item_completed", "item": { "type": "FileChange", "id": "exec-0c101224-08ce-4506-a4a6-07bd5e0fc126", "changes": { "/app/solution/train_current_model.py": { "type": "update", "unified_diff": "@@ -2004,2 +2004,8 @@\n parser.add_argument(\n+ \"--explicit-dislike-negatives\",\n+ type=int,\n+ default=Config.explicit_dislike_negatives,\n+ help=\"sample active explicit dislikes as user-specific negatives\",\n+ )\n+ parser.add_argument(\n \"--inbatch-correction-power\",\n@@ -2093,3 +2099,5 @@\n or args.inbatch_negatives < 0\n- or args.uniform_negatives + args.inbatch_negatives < 1\n+ or args.explicit_dislike_negatives < 0\n+ or args.explicit_dislike_negatives > base.DISLIKE_ITEMS\n+ or args.uniform_negatives + args.inbatch_negatives + args.explicit_dislike_negatives < 1\n or args.inbatch_correction_power < 0\n@@ -2111,2 +2119,3 @@\n hard_inbatch_pool=args.hard_inbatch_pool,\n+ explicit_dislike_negatives=args.explicit_dislike_negatives,\n inbatch_correction_power=args.inbatch_correction_power,\n", "move_path": null } }, "status": "completed", "stdout": "Success. Updated the following files:\nM /app/solution/train_current_model.py\n", "stderr": "" } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44e06f75087d2abc67ecc4bafd15e", "usage": { "input_tokens": 71106, "cached_input_tokens": 66688, "cache_write_input_tokens": 0, "output_tokens": 364, "reasoning_output_tokens": 79, "total_tokens": 71470 }, "turn_token_usage": { "input_tokens": 3454600, "cached_input_tokens": 3326208, "cache_write_input_tokens": 0, "output_tokens": 13627, "reasoning_output_tokens": 4852, "total_tokens": 3468227 }, "thread_token_usage": { "input_tokens": 3454600, "cached_input_tokens": 3326208, "cache_write_input_tokens": 0, "output_tokens": 13627, "reasoning_output_tokens": 4852, "total_tokens": 3468227 } } ## Step 58 · agent · 2026-09-23T22:09:30.697Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:09:35.374Z { "code": "const r = await tools.exec_command({cmd:\"/opt/task-venv/bin/python -m py_compile /app/solution/train_current_model.py && PYTHONPATH=/app/solution /opt/task-venv/bin/python - <<'PY'\\nimport torch\\nfrom train_current_model import Config, corrected_negative_loss\\nx=torch.zeros(3,32); w=torch.ones_like(x)\\nc=Config(uniform_negatives=20,inbatch_negatives=8,explicit_dislike_negatives=4)\\nprint(corrected_negative_loss(x,w,c))\\nPY\",\"workdir\":\"/app\",\"yield_time_ms\":10000,\"max_output_tokens\":3000}); text(r.output)\n" } ### Tool output · 2026-09-23T22:09:39.863Z Script completed Wall time 4.5 seconds Output: tensor([0.6931, 0.6931, 0.6931]) ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44e142a0c87d2a5729033d5f8bf36", "usage": { "input_tokens": 71494, "cached_input_tokens": 70912, "cache_write_input_tokens": 0, "output_tokens": 168, "reasoning_output_tokens": 14, "total_tokens": 71662 }, "turn_token_usage": { "input_tokens": 3526094, "cached_input_tokens": 3397120, "cache_write_input_tokens": 0, "output_tokens": 13795, "reasoning_output_tokens": 4866, "total_tokens": 3539889 }, "thread_token_usage": { "input_tokens": 3526094, "cached_input_tokens": 3397120, "cache_write_input_tokens": 0, "output_tokens": 13795, "reasoning_output_tokens": 4866, "total_tokens": 3539889 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-314af3d9-8a44-496e-b3ab-d8dfe18c385d", "process_id": "88229", "command": [ "/bin/sh", "-lc", "/opt/task-venv/bin/python -m py_compile /app/solution/train_current_model.py && PYTHONPATH=/app/solution /opt/task-venv/bin/python - <<'PY'\nimport torch\nfrom train_current_model import Config, corrected_negative_loss\nx=torch.zeros(3,32); w=torch.ones_like(x)\nc=Config(uniform_negatives=20,inbatch_negatives=8,explicit_dislike_negatives=4)\nprint(corrected_negative_loss(x,w,c))\nPY" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "/opt/task-venv/bin/python -m py_compile /app/solution/train_current_model.py && PYTHONPATH=/app/solution /opt/task-venv/bin/python - <<'PY'\nimport torch\nfrom train_current_model import Config, corrected_negative_loss\nx=torch.zeros(3,32); w=torch.ones_like(x)\nc=Config(uniform_negatives=20,inbatch_negatives=8,explicit_dislike_negatives=4)\nprint(corrected_negative_loss(x,w,c))\nPY" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "tensor([0.6931, 0.6931, 0.6931])\n", "stderr": "", "aggregated_output": "tensor([0.6931, 0.6931, 0.6931])\n", "exit_code": 0, "duration": { "secs": 4, "nanos": 319612647 }, "formatted_output": "tensor([0.6931, 0.6931, 0.6931])\n" } } ## Step 59 · agent · 2026-09-23T22:09:47.823Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:09:51.646Z { "code": "const r = await tools.exec_command({cmd:\"/opt/task-venv/bin/python /app/solution/train_current_model.py --stage validation --public-dir /task --prepared-cache /app/solution/validation_cache.npz --output /app/solution/dislike_validation.parquet --uniform-negatives 20 --inbatch-negatives 8 --explicit-dislike-negatives 4 --checkpoint-dir /app/solution/dislike_ckpt\",\"workdir\":\"/app/solution\",\"yield_time_ms\":1000,\"max_output_tokens\":8000}); text(JSON.stringify(r))\n" } ### Tool output · 2026-09-23T22:09:52.812Z Script completed Wall time 1.2 seconds Output: {"chunk_id":"0321c1","wall_time_seconds":1.00073309,"session_id":8975,"original_token_count":0,"output":""} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44e2415dc87d2b6cecc136c1b9b66", "usage": { "input_tokens": 71704, "cached_input_tokens": 71296, "cache_write_input_tokens": 0, "output_tokens": 150, "reasoning_output_tokens": 21, "total_tokens": 71854 }, "turn_token_usage": { "input_tokens": 3597798, "cached_input_tokens": 3468416, "cache_write_input_tokens": 0, "output_tokens": 13945, "reasoning_output_tokens": 4887, "total_tokens": 3611743 }, "thread_token_usage": { "input_tokens": 3597798, "cached_input_tokens": 3468416, "cache_write_input_tokens": 0, "output_tokens": 13945, "reasoning_output_tokens": 4887, "total_tokens": 3611743 } } ## Step 60 · agent · 2026-09-23T22:09:59.364Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:10:00.785Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:8975,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:10:30.822Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"620067","wall_time_seconds":30.001793325,"session_id":8975,"original_token_count":103} loaded full-sequence cache: tokens=20,056,329 targets=20,047,194 chronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194 inbatch correction: min=0.250 mean_on_targets=1.001 max=4.000 target weighting=organic-strong min=0.250 mean=0.575 max=1.000 full-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250 ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44e3102d087d292f3a5426535f206", "usage": { "input_tokens": 71912, "cached_input_tokens": 71552, "cache_write_input_tokens": 0, "output_tokens": 59, "reasoning_output_tokens": 6, "total_tokens": 71971 }, "turn_token_usage": { "input_tokens": 3669710, "cached_input_tokens": 3539968, "cache_write_input_tokens": 0, "output_tokens": 14004, "reasoning_output_tokens": 4893, "total_tokens": 3683714 }, "thread_token_usage": { "input_tokens": 3669710, "cached_input_tokens": 3539968, "cache_write_input_tokens": 0, "output_tokens": 14004, "reasoning_output_tokens": 4893, "total_tokens": 3683714 } } ## Step 61 · agent · 2026-09-23T22:10:35.237Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:10:36.659Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:8975,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:11:06.676Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"69fd83","wall_time_seconds":30.000801354,"session_id":8975,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44e5710a887d28e5c55d7912ac219", "usage": { "input_tokens": 72157, "cached_input_tokens": 71680, "cache_write_input_tokens": 0, "output_tokens": 96, "reasoning_output_tokens": 43, "total_tokens": 72253 }, "turn_token_usage": { "input_tokens": 3741867, "cached_input_tokens": 3611648, "cache_write_input_tokens": 0, "output_tokens": 14100, "reasoning_output_tokens": 4936, "total_tokens": 3755967 }, "thread_token_usage": { "input_tokens": 3741867, "cached_input_tokens": 3611648, "cache_write_input_tokens": 0, "output_tokens": 14100, "reasoning_output_tokens": 4936, "total_tokens": 3755967 } } ### exec · 2026-09-23T22:11:10.668Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:8975,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:11:40.694Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"0d524b","wall_time_seconds":30.000819968,"session_id":8975,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44e7ae5c887d29aa573dc14ce11d6", "usage": { "input_tokens": 72306, "cached_input_tokens": 71936, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 72357 }, "turn_token_usage": { "input_tokens": 3814173, "cached_input_tokens": 3683584, "cache_write_input_tokens": 0, "output_tokens": 14151, "reasoning_output_tokens": 4936, "total_tokens": 3828324 }, "thread_token_usage": { "input_tokens": 3814173, "cached_input_tokens": 3683584, "cache_write_input_tokens": 0, "output_tokens": 14151, "reasoning_output_tokens": 4936, "total_tokens": 3828324 } } ## Step 62 · agent · 2026-09-23T22:12:03.896Z ### Thinking unavailable — no text recorded About half of retained training contexts have an active explicit dislike, yet the production sampler almost never draws those items by chance. The current run replaces four easy uniform negatives with four active-dislike negatives (20 uniform + 8 corrected in-batch + 4 explicit), directly supervising the existing dislike channel without changing model size or serving cost. ### exec · 2026-09-23T22:12:14.804Z { "code": "const r = await tools.exec_command({cmd:\"PYTHONPATH=/task /opt/task-venv/bin/python - <<'PY'\\nimport pandas as pd,numpy as np\\nfrom pathlib import Path\\nfrom ranking_evaluation import CandidateSet,score_rankings\\nfrom evaluate_public import validation_truth\\nD=Path('/task/data'); cs=CandidateSet(D/'validation_eligible_candidates.npz'); truth=validation_truth(cs,set(pd.read_parquet(D/'target_users.parquet').uid.astype(int)))\\ncat=pd.read_parquet(D/'candidate_catalog.parquet'); pop=dict(zip(cat.item_id.astype(int),cat.popularity_rank.astype(int)))\\nr=pd.read_parquet('/app/solution/production_validation.parquet')\\nfor a in [-20,-10,-5,-2,-1,-.5,0,.5,1,2,5,10,20]:\\n ranked={}\\n for uid,g in r.groupby('uid',sort=False):\\n # standardized log popularity rank; lower is popular\\n old=g['rank'].to_numpy(); pr=np.array([pop[int(x)] for x in g.item_id]); key=old+a*np.log(pr)\\n ranked[int(uid)]=g.item_id.to_numpy()[np.argsort(key,kind='stable')].tolist()\\n print(a,score_rankings(ranked,truth)['quality_ndcg@10'])\\nPY\",\"workdir\":\"/app\",\"yield_time_ms\":30000,\"max_output_tokens\":5000}); text(r.output)\n" } ### Tool output · 2026-09-23T22:12:36.306Z Script completed Wall time 21.5 seconds Output: -20 0.019963 -10 0.020658 -5 0.021306 -2 0.02239 -1 0.021974 -0.5 0.021823 0 0.02128 0.5 0.020177 1 0.019763 2 0.018381 5 0.014828 10 0.01278 20 0.011589 ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44e9ced1c87d2a2604931efe04a97", "usage": { "input_tokens": 72411, "cached_input_tokens": 72064, "cache_write_input_tokens": 0, "output_tokens": 874, "reasoning_output_tokens": 472, "total_tokens": 73285 }, "turn_token_usage": { "input_tokens": 3886584, "cached_input_tokens": 3755648, "cache_write_input_tokens": 0, "output_tokens": 15025, "reasoning_output_tokens": 5408, "total_tokens": 3901609 }, "thread_token_usage": { "input_tokens": 3886584, "cached_input_tokens": 3755648, "cache_write_input_tokens": 0, "output_tokens": 15025, "reasoning_output_tokens": 5408, "total_tokens": 3901609 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-e889c78e-5305-4c27-b67f-cee565d7058b", "process_id": "80140", "command": [ "/bin/sh", "-lc", "PYTHONPATH=/task /opt/task-venv/bin/python - <<'PY'\nimport pandas as pd,numpy as np\nfrom pathlib import Path\nfrom ranking_evaluation import CandidateSet,score_rankings\nfrom evaluate_public import validation_truth\nD=Path('/task/data'); cs=CandidateSet(D/'validation_eligible_candidates.npz'); truth=validation_truth(cs,set(pd.read_parquet(D/'target_users.parquet').uid.astype(int)))\ncat=pd.read_parquet(D/'candidate_catalog.parquet'); pop=dict(zip(cat.item_id.astype(int),cat.popularity_rank.astype(int)))\nr=pd.read_parquet('/app/solution/production_validation.parquet')\nfor a in [-20,-10,-5,-2,-1,-.5,0,.5,1,2,5,10,20]:\n ranked={}\n for uid,g in r.groupby('uid',sort=False):\n # standardized log popularity rank; lower is popular\n old=g['rank'].to_numpy(); pr=np.array([pop[int(x)] for x in g.item_id]); key=old+a*np.log(pr)\n ranked[int(uid)]=g.item_id.to_numpy()[np.argsort(key,kind='stable')].tolist()\n print(a,score_rankings(ranked,truth)['quality_ndcg@10'])\nPY" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "PYTHONPATH=/task /opt/task-venv/bin/python - <<'PY'\nimport pandas as pd,numpy as np\nfrom pathlib import Path\nfrom ranking_evaluation import CandidateSet,score_rankings\nfrom evaluate_public import validation_truth\nD=Path('/task/data'); cs=CandidateSet(D/'validation_eligible_candidates.npz'); truth=validation_truth(cs,set(pd.read_parquet(D/'target_users.parquet').uid.astype(int)))\ncat=pd.read_parquet(D/'candidate_catalog.parquet'); pop=dict(zip(cat.item_id.astype(int),cat.popularity_rank.astype(int)))\nr=pd.read_parquet('/app/solution/production_validation.parquet')\nfor a in [-20,-10,-5,-2,-1,-.5,0,.5,1,2,5,10,20]:\n ranked={}\n for uid,g in r.groupby('uid',sort=False):\n # standardized log popularity rank; lower is popular\n old=g['rank'].to_numpy(); pr=np.array([pop[int(x)] for x in g.item_id]); key=old+a*np.log(pr)\n ranked[int(uid)]=g.item_id.to_numpy()[np.argsort(key,kind='stable')].tolist()\n print(a,score_rankings(ranked,truth)['quality_ndcg@10'])\nPY" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "-20 0.019963\n-10 0.020658\n-5 0.021306\n-2 0.02239\n-1 0.021974\n-0.5 0.021823\n0 0.02128\n0.5 0.020177\n1 0.019763\n2 0.018381\n5 0.014828\n10 0.01278\n20 0.011589\n", "stderr": "", "aggregated_output": "-20 0.019963\n-10 0.020658\n-5 0.021306\n-2 0.02239\n-1 0.021974\n-0.5 0.021823\n0 0.02128\n0.5 0.020177\n1 0.019763\n2 0.018381\n5 0.014828\n10 0.01278\n20 0.011589\n", "exit_code": 0, "duration": { "secs": 21, "nanos": 298359139 }, "formatted_output": "-20 0.019963\n-10 0.020658\n-5 0.021306\n-2 0.02239\n-1 0.021974\n-0.5 0.021823\n0 0.02128\n0.5 0.020177\n1 0.019763\n2 0.018381\n5 0.014828\n10 0.01278\n20 0.011589\n" } } ## Step 63 · agent · 2026-09-23T22:12:45.689Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:12:47.091Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:8975,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:13:17.131Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"d11c15","wall_time_seconds":30.001842405,"session_id":8975,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44ed47b1c87d28c6e2cfc77d13d81", "usage": { "input_tokens": 73409, "cached_input_tokens": 72192, "cache_write_input_tokens": 0, "output_tokens": 291, "reasoning_output_tokens": 238, "total_tokens": 73700 }, "turn_token_usage": { "input_tokens": 3959993, "cached_input_tokens": 3827840, "cache_write_input_tokens": 0, "output_tokens": 15316, "reasoning_output_tokens": 5646, "total_tokens": 3975309 }, "thread_token_usage": { "input_tokens": 3959993, "cached_input_tokens": 3827840, "cache_write_input_tokens": 0, "output_tokens": 15316, "reasoning_output_tokens": 5646, "total_tokens": 3975309 } } ### exec · 2026-09-23T22:13:20.813Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:8975,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:13:50.833Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"1eb451","wall_time_seconds":30.002033216,"session_id":8975,"original_token_count":24} epoch=1/1 batches=250 targets=987,417 batch_bce=0.547270 running_bce=0.545510 elapsed=219.7s ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44efd6dfc87d285c1f5fcb259a03d", "usage": { "input_tokens": 73754, "cached_input_tokens": 73216, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 73805 }, "turn_token_usage": { "input_tokens": 4033747, "cached_input_tokens": 3901056, "cache_write_input_tokens": 0, "output_tokens": 15367, "reasoning_output_tokens": 5646, "total_tokens": 4049114 }, "thread_token_usage": { "input_tokens": 4033747, "cached_input_tokens": 3901056, "cache_write_input_tokens": 0, "output_tokens": 15367, "reasoning_output_tokens": 5646, "total_tokens": 4049114 } } ### exec · 2026-09-23T22:13:53.735Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:8975,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:14:23.761Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"5bf869","wall_time_seconds":30.000649885,"session_id":8975,"original_token_count":74} saved epoch checkpoint: /app/solution/dislike_ckpt/epoch-01.pt epoch=1/1 train_loss=0.54388 validation_loss=0.50183 pair_accuracy=0.748 train_targets=1,052,953 validation_targets=130,103 train_seconds=233.6 validation_seconds=16.3 restored best validation-BCE checkpoint: epoch=1 loss=0.501830 ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44f1f195487d282554a20c972a27b", "usage": { "input_tokens": 73894, "cached_input_tokens": 73600, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 73945 }, "turn_token_usage": { "input_tokens": 4107641, "cached_input_tokens": 3974656, "cache_write_input_tokens": 0, "output_tokens": 15418, "reasoning_output_tokens": 5646, "total_tokens": 4123059 }, "thread_token_usage": { "input_tokens": 4107641, "cached_input_tokens": 3974656, "cache_write_input_tokens": 0, "output_tokens": 15418, "reasoning_output_tokens": 5646, "total_tokens": 4123059 } } ## Step 64 · agent · 2026-09-23T22:14:30.480Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:14:31.878Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:8975,yield_time_ms:30000,max_output_tokens:6000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:15:01.901Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"db89ee","wall_time_seconds":30.00118629,"session_id":8975,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44f3ffc5487d2bef0abff012f108a", "usage": { "input_tokens": 74086, "cached_input_tokens": 73728, "cache_write_input_tokens": 0, "output_tokens": 59, "reasoning_output_tokens": 6, "total_tokens": 74145 }, "turn_token_usage": { "input_tokens": 4181727, "cached_input_tokens": 4048384, "cache_write_input_tokens": 0, "output_tokens": 15477, "reasoning_output_tokens": 5652, "total_tokens": 4197204 }, "thread_token_usage": { "input_tokens": 4181727, "cached_input_tokens": 4048384, "cache_write_input_tokens": 0, "output_tokens": 15477, "reasoning_output_tokens": 5652, "total_tokens": 4197204 } } ### exec · 2026-09-23T22:15:04.688Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:8975,yield_time_ms:30000,max_output_tokens:2000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:15:34.713Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"2bbd36","wall_time_seconds":30.000802345,"session_id":8975,"original_token_count":818} ranked users=1,024/8,456 ranked users=2,048/8,456 ranked users=3,072/8,456 ranked users=4,096/8,456 ranked users=5,120/8,456 ranked users=6,144/8,456 ranked users=7,168/8,456 ranked users=8,192/8,456 ranked users=8,456/8,456 { "baseline": "yambda-windowed-sequence-two-tower-base", "stage": "validation", "output": "/app/solution/dislike_validation.parquet", "rows": 845600, "users": 8456, "runtime_seconds": 338.886, "public_inputs_only": true, "architecture": { "family": "pure-windowed-sequence-two-tower", "sequence_training": "every-adjacent-target-within-recent-chronological-window", "sequence_encoder": "one-layer-GRU-dense-timestep-loss", "bptt_hidden_state": "carried-and-detached", "model_selection": "chronological-validation-BCE-early-stopping", "loss_execution": "gradient-accumulated-microbatches", "user_id_embedding": false, "user_mlp": "582-512-256-192", "item_mlp": "196-512-256-192", "normalization": "none", "score": "raw-dot-product", "objective": "sample-weighted-BCE-at-every-timestep", "negative_sampling": "24-uniform-plus-8-propensity-corrected-inbatch", "false_negative_filter": "full-training-history", "target_weighting": "organic-strong" }, "config": { "bptt_steps": 100, "user_batch_size": 64, "embedding_dim": 192, "hidden_dim": 192, "user_hidden_1": 512, "user_hidden_2": 256, "item_hidden_1": 512, "item_hidden_2": 256, "dropout": 0.05, "epochs": 1, "learning_rate": 0.001, "weight_decay": 1e-05, "gradient_clip": 2.0, "loss_microbatch_size": 65536, "uniform_negatives": 20, "inbatch_negatives": 8, "hard_inbatch_pool": 0, "explicit_dislike_negatives": 4, "inbatch_correction_power": 0.5, "inbatch_correction_min": 0.25, "inbatch_correction_max": 4.0, "negative_filter_scope": "full-training-history", "target_weighting": "organic-strong", "ordinary_target_weight": 0.25, "organic_strong_target_weight": 1.0, "organic_like_target_weight": 3.0, "discovery_horizon_days": 7, "validation_fraction": 0.1, "max_train_targets_per_user": 128, "max_validation_targets_per_user": 16, "early_stopping_patience": 1, "early_stopping_min_delta": 0.0001, "seed": 29 }, "sequence_tokens": 20056329, "all_next_item_targets": 20047194, "selected_training_targets": 1052953, "selected_validation_targets": 130103, "discarded_old_targets": 18864138, "training_history": [ { "epoch": 1.0, "loss": 0.5438769299227006, "positive_logit": 0.7048195059545893, "negative_logit": -0.590760938330918, "pair_accuracy": 0.7480166790445537, "targets": 1052953.0, "target_weight_sum": 632551.0, "batches": 266.0, "seconds": 233.55434959500008, "validation_loss": 0.501830002602534, "validation_targets": 130103.0, "validation_target_weight_sum": 78769.25, "validation_seconds": 16.345575351000207 } ], "embedding_diagnostics": { "query_norm_mean": 1.4384108781814575, "query_norm_std": 0.6251412034034729, "item_norm_mean": 1.8869179487228394, "item_norm_std": 0.9564805626869202 }, "torch_version": "2.8.0+cpu", "device": "cpu" } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44f663a1087d2a666b906c458b63e", "usage": { "input_tokens": 74198, "cached_input_tokens": 73856, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 74249 }, "turn_token_usage": { "input_tokens": 4255925, "cached_input_tokens": 4122240, "cache_write_input_tokens": 0, "output_tokens": 15528, "reasoning_output_tokens": 5652, "total_tokens": 4271453 }, "thread_token_usage": { "input_tokens": 4255925, "cached_input_tokens": 4122240, "cache_write_input_tokens": 0, "output_tokens": 15528, "reasoning_output_tokens": 5652, "total_tokens": 4271453 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-fda4c6eb-5ea9-43a3-9d8c-cb8ebe5abfe2", "process_id": "8975", "command": [ "/bin/sh", "-lc", "/opt/task-venv/bin/python /app/solution/train_current_model.py --stage validation --public-dir /task --prepared-cache /app/solution/validation_cache.npz --output /app/solution/dislike_validation.parquet --uniform-negatives 20 --inbatch-negatives 8 --explicit-dislike-negatives 4 --checkpoint-dir /app/solution/dislike_ckpt" ], "cwd": "file:///app/solution", "parsed_cmd": [ { "type": "unknown", "cmd": "/opt/task-venv/bin/python /app/solution/train_current_model.py --stage validation --public-dir /task --prepared-cache /app/solution/validation_cache.npz --output /app/solution/dislike_validation.parquet --uniform-negatives 20 --inbatch-negatives 8 --explicit-dislike-negatives 4 --checkpoint-dir /app/solution/dislike_ckpt" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "loaded full-sequence cache: tokens=20,056,329 targets=20,047,194\nchronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194\ninbatch correction: min=0.250 mean_on_targets=1.001 max=4.000\ntarget weighting=organic-strong min=0.250 mean=0.575 max=1.000\nfull-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250\nepoch=1/1 batches=250 targets=987,417 batch_bce=0.547270 running_bce=0.545510 elapsed=219.7s\nsaved epoch checkpoint: /app/solution/dislike_ckpt/epoch-01.pt\nepoch=1/1 train_loss=0.54388 validation_loss=0.50183 pair_accuracy=0.748 train_targets=1,052,953 validation_targets=130,103 train_seconds=233.6 validation_seconds=16.3\nrestored best validation-BCE checkpoint: epoch=1 loss=0.501830\nranked users=1,024/8,456\nranked users=2,048/8,456\nranked users=3,072/8,456\nranked users=4,096/8,456\nranked users=5,120/8,456\nranked users=6,144/8,456\nranked users=7,168/8,456\nranked users=8,192/8,456\nranked users=8,456/8,456\n{\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": \"validation\",\n \"output\": \"/app/solution/dislike_validation.parquet\",\n \"rows\": 845600,\n \"users\": 8456,\n \"runtime_seconds\": 338.886,\n \"public_inputs_only\": true,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": \"every-adjacent-target-within-recent-chronological-window\",\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": false,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": \"24-uniform-plus-8-propensity-corrected-inbatch\",\n \"false_negative_filter\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\"\n },\n \"config\": {\n \"bptt_steps\": 100,\n \"user_batch_size\": 64,\n \"embedding_dim\": 192,\n \"hidden_dim\": 192,\n \"user_hidden_1\": 512,\n \"user_hidden_2\": 256,\n \"item_hidden_1\": 512,\n \"item_hidden_2\": 256,\n \"dropout\": 0.05,\n \"epochs\": 1,\n \"learning_rate\": 0.001,\n \"weight_decay\": 1e-05,\n \"gradient_clip\": 2.0,\n \"loss_microbatch_size\": 65536,\n \"uniform_negatives\": 20,\n \"inbatch_negatives\": 8,\n \"hard_inbatch_pool\": 0,\n \"explicit_dislike_negatives\": 4,\n \"inbatch_correction_power\": 0.5,\n \"inbatch_correction_min\": 0.25,\n \"inbatch_correction_max\": 4.0,\n \"negative_filter_scope\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\",\n \"ordinary_target_weight\": 0.25,\n \"organic_strong_target_weight\": 1.0,\n \"organic_like_target_weight\": 3.0,\n \"discovery_horizon_days\": 7,\n \"validation_fraction\": 0.1,\n \"max_train_targets_per_user\": 128,\n \"max_validation_targets_per_user\": 16,\n \"early_stopping_patience\": 1,\n \"early_stopping_min_delta\": 0.0001,\n \"seed\": 29\n },\n \"sequence_tokens\": 20056329,\n \"all_next_item_targets\": 20047194,\n \"selected_training_targets\": 1052953,\n \"selected_validation_targets\": 130103,\n \"discarded_old_targets\": 18864138,\n \"training_history\": [\n {\n \"epoch\": 1.0,\n \"loss\": 0.5438769299227006,\n \"positive_logit\": 0.7048195059545893,\n \"negative_logit\": -0.590760938330918,\n \"pair_accuracy\": 0.7480166790445537,\n \"targets\": 1052953.0,\n \"target_weight_sum\": 632551.0,\n \"batches\": 266.0,\n \"seconds\": 233.55434959500008,\n \"validation_loss\": 0.501830002602534,\n \"validation_targets\": 130103.0,\n \"validation_target_weight_sum\": 78769.25,\n \"validation_seconds\": 16.345575351000207\n }\n ],\n \"embedding_diagnostics\": {\n \"query_norm_mean\": 1.4384108781814575,\n \"query_norm_std\": 0.6251412034034729,\n \"item_norm_mean\": 1.8869179487228394,\n \"item_norm_std\": 0.9564805626869202\n },\n \"torch_version\": \"2.8.0+cpu\",\n \"device\": \"cpu\"\n}\n", "stderr": "", "aggregated_output": "loaded full-sequence cache: tokens=20,056,329 targets=20,047,194\nchronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194\ninbatch correction: min=0.250 mean_on_targets=1.001 max=4.000\ntarget weighting=organic-strong min=0.250 mean=0.575 max=1.000\nfull-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250\nepoch=1/1 batches=250 targets=987,417 batch_bce=0.547270 running_bce=0.545510 elapsed=219.7s\nsaved epoch checkpoint: /app/solution/dislike_ckpt/epoch-01.pt\nepoch=1/1 train_loss=0.54388 validation_loss=0.50183 pair_accuracy=0.748 train_targets=1,052,953 validation_targets=130,103 train_seconds=233.6 validation_seconds=16.3\nrestored best validation-BCE checkpoint: epoch=1 loss=0.501830\nranked users=1,024/8,456\nranked users=2,048/8,456\nranked users=3,072/8,456\nranked users=4,096/8,456\nranked users=5,120/8,456\nranked users=6,144/8,456\nranked users=7,168/8,456\nranked users=8,192/8,456\nranked users=8,456/8,456\n{\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": \"validation\",\n \"output\": \"/app/solution/dislike_validation.parquet\",\n \"rows\": 845600,\n \"users\": 8456,\n \"runtime_seconds\": 338.886,\n \"public_inputs_only\": true,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": \"every-adjacent-target-within-recent-chronological-window\",\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": false,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": \"24-uniform-plus-8-propensity-corrected-inbatch\",\n \"false_negative_filter\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\"\n },\n \"config\": {\n \"bptt_steps\": 100,\n \"user_batch_size\": 64,\n \"embedding_dim\": 192,\n \"hidden_dim\": 192,\n \"user_hidden_1\": 512,\n \"user_hidden_2\": 256,\n \"item_hidden_1\": 512,\n \"item_hidden_2\": 256,\n \"dropout\": 0.05,\n \"epochs\": 1,\n \"learning_rate\": 0.001,\n \"weight_decay\": 1e-05,\n \"gradient_clip\": 2.0,\n \"loss_microbatch_size\": 65536,\n \"uniform_negatives\": 20,\n \"inbatch_negatives\": 8,\n \"hard_inbatch_pool\": 0,\n \"explicit_dislike_negatives\": 4,\n \"inbatch_correction_power\": 0.5,\n \"inbatch_correction_min\": 0.25,\n \"inbatch_correction_max\": 4.0,\n \"negative_filter_scope\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\",\n \"ordinary_target_weight\": 0.25,\n \"organic_strong_target_weight\": 1.0,\n \"organic_like_target_weight\": 3.0,\n \"discovery_horizon_days\": 7,\n \"validation_fraction\": 0.1,\n \"max_train_targets_per_user\": 128,\n \"max_validation_targets_per_user\": 16,\n \"early_stopping_patience\": 1,\n \"early_stopping_min_delta\": 0.0001,\n \"seed\": 29\n },\n \"sequence_tokens\": 20056329,\n \"all_next_item_targets\": 20047194,\n \"selected_training_targets\": 1052953,\n \"selected_validation_targets\": 130103,\n \"discarded_old_targets\": 18864138,\n \"training_history\": [\n {\n \"epoch\": 1.0,\n \"loss\": 0.5438769299227006,\n \"positive_logit\": 0.7048195059545893,\n \"negative_logit\": -0.590760938330918,\n \"pair_accuracy\": 0.7480166790445537,\n \"targets\": 1052953.0,\n \"target_weight_sum\": 632551.0,\n \"batches\": 266.0,\n \"seconds\": 233.55434959500008,\n \"validation_loss\": 0.501830002602534,\n \"validation_targets\": 130103.0,\n \"validation_target_weight_sum\": 78769.25,\n \"validation_seconds\": 16.345575351000207\n }\n ],\n \"embedding_diagnostics\": {\n \"query_norm_mean\": 1.4384108781814575,\n \"query_norm_std\": 0.6251412034034729,\n \"item_norm_mean\": 1.8869179487228394,\n \"item_norm_std\": 0.9564805626869202\n },\n \"torch_version\": \"2.8.0+cpu\",\n \"device\": \"cpu\"\n}\n", "exit_code": 0, "duration": { "secs": 343, "nanos": 365062753 }, "formatted_output": "loaded full-sequence cache: tokens=20,056,329 targets=20,047,194\nchronological BCE window: train=1,052,953 validation=130,103 selected=1,183,056 discarded_old_targets=18,864,138 all=20,047,194\ninbatch correction: min=0.250 mean_on_targets=1.001 max=4.000\ntarget weighting=organic-strong min=0.250 mean=0.575 max=1.000\nfull-history false-negative filter: users=9,135 unique_user_items=5,524,275 bytes=34,256,250\nepoch=1/1 batches=250 targets=987,417 batch_bce=0.547270 running_bce=0.545510 elapsed=219.7s\nsaved epoch checkpoint: /app/solution/dislike_ckpt/epoch-01.pt\nepoch=1/1 train_loss=0.54388 validation_loss=0.50183 pair_accuracy=0.748 train_targets=1,052,953 validation_targets=130,103 train_seconds=233.6 validation_seconds=16.3\nrestored best validation-BCE checkpoint: epoch=1 loss=0.501830\nranked users=1,024/8,456\nranked users=2,048/8,456\nranked users=3,072/8,456\nranked users=4,096/8,456\nranked users=5,120/8,456\nranked users=6,144/8,456\nranked users=7,168/8,456\nranked users=8,192/8,456\nranked users=8,456/8,456\n{\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": \"validation\",\n \"output\": \"/app/solution/dislike_validation.parquet\",\n \"rows\": 845600,\n \"users\": 8456,\n \"runtime_seconds\": 338.886,\n \"public_inputs_only\": true,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": \"every-adjacent-target-within-recent-chronological-window\",\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": false,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": \"24-uniform-plus-8-propensity-corrected-inbatch\",\n \"false_negative_filter\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\"\n },\n \"config\": {\n \"bptt_steps\": 100,\n \"user_batch_size\": 64,\n \"embedding_dim\": 192,\n \"hidden_dim\": 192,\n \"user_hidden_1\": 512,\n \"user_hidden_2\": 256,\n \"item_hidden_1\": 512,\n \"item_hidden_2\": 256,\n \"dropout\": 0.05,\n \"epochs\": 1,\n \"learning_rate\": 0.001,\n \"weight_decay\": 1e-05,\n \"gradient_clip\": 2.0,\n \"loss_microbatch_size\": 65536,\n \"uniform_negatives\": 20,\n \"inbatch_negatives\": 8,\n \"hard_inbatch_pool\": 0,\n \"explicit_dislike_negatives\": 4,\n \"inbatch_correction_power\": 0.5,\n \"inbatch_correction_min\": 0.25,\n \"inbatch_correction_max\": 4.0,\n \"negative_filter_scope\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\",\n \"ordinary_target_weight\": 0.25,\n \"organic_strong_target_weight\": 1.0,\n \"organic_like_target_weight\": 3.0,\n \"discovery_horizon_days\": 7,\n \"validation_fraction\": 0.1,\n \"max_train_targets_per_user\": 128,\n \"max_validation_targets_per_user\": 16,\n \"early_stopping_patience\": 1,\n \"early_stopping_min_delta\": 0.0001,\n \"seed\": 29\n },\n \"sequence_tokens\": 20056329,\n \"all_next_item_targets\": 20047194,\n \"selected_training_targets\": 1052953,\n \"selected_validation_targets\": 130103,\n \"discarded_old_targets\": 18864138,\n \"training_history\": [\n {\n \"epoch\": 1.0,\n \"loss\": 0.5438769299227006,\n \"positive_logit\": 0.7048195059545893,\n \"negative_logit\": -0.590760938330918,\n \"pair_accuracy\": 0.7480166790445537,\n \"targets\": 1052953.0,\n \"target_weight_sum\": 632551.0,\n \"batches\": 266.0,\n \"seconds\": 233.55434959500008,\n \"validation_loss\": 0.501830002602534,\n \"validation_targets\": 130103.0,\n \"validation_target_weight_sum\": 78769.25,\n \"validation_seconds\": 16.345575351000207\n }\n ],\n \"embedding_diagnostics\": {\n \"query_norm_mean\": 1.4384108781814575,\n \"query_norm_std\": 0.6251412034034729,\n \"item_norm_mean\": 1.8869179487228394,\n \"item_norm_std\": 0.9564805626869202\n },\n \"torch_version\": \"2.8.0+cpu\",\n \"device\": \"cpu\"\n}\n" } } ### exec · 2026-09-23T22:15:43.947Z { "code": "const r = await tools.exec_command({cmd:\"/opt/task-venv/bin/python /task/evaluate_public.py /app/solution/dislike_validation.parquet\",\"workdir\":\"/app\",\"yield_time_ms\":30000,\"max_output_tokens\":3000}); text(r.output)\n" } ### Tool output · 2026-09-23T22:15:47.475Z Script completed Wall time 3.5 seconds Output: { "model": "/app/solution/dislike_validation.parquet", "scores": { "quality_ndcg@10": 0.022728, "quality_users": 4263 } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44f86ed9887d29bfa1526427421be", "usage": { "input_tokens": 75383, "cached_input_tokens": 73984, "cache_write_input_tokens": 0, "output_tokens": 68, "reasoning_output_tokens": 0, "total_tokens": 75451 }, "turn_token_usage": { "input_tokens": 4331308, "cached_input_tokens": 4196224, "cache_write_input_tokens": 0, "output_tokens": 15596, "reasoning_output_tokens": 5652, "total_tokens": 4346904 }, "thread_token_usage": { "input_tokens": 4331308, "cached_input_tokens": 4196224, "cache_write_input_tokens": 0, "output_tokens": 15596, "reasoning_output_tokens": 5652, "total_tokens": 4346904 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-adc3738d-ce2a-41ac-968c-e8656be7e969", "process_id": "46937", "command": [ "/bin/sh", "-lc", "/opt/task-venv/bin/python /task/evaluate_public.py /app/solution/dislike_validation.parquet" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "/opt/task-venv/bin/python /task/evaluate_public.py /app/solution/dislike_validation.parquet" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "{\n \"model\": \"/app/solution/dislike_validation.parquet\",\n \"scores\": {\n \"quality_ndcg@10\": 0.022728,\n \"quality_users\": 4263\n }\n}\n", "stderr": "", "aggregated_output": "{\n \"model\": \"/app/solution/dislike_validation.parquet\",\n \"scores\": {\n \"quality_ndcg@10\": 0.022728,\n \"quality_users\": 4263\n }\n}\n", "exit_code": 0, "duration": { "secs": 3, "nanos": 360278428 }, "formatted_output": "{\n \"model\": \"/app/solution/dislike_validation.parquet\",\n \"scores\": {\n \"quality_ndcg@10\": 0.022728,\n \"quality_users\": 4263\n }\n}\n" } } ## Step 65 · agent · 2026-09-23T22:15:55.079Z ### Thinking unavailable — no text recorded The explicit-negative run clears production: public NDCG@10 rises from 0.021280 to 0.022728 (+6.8%). This confirms the diagnosis—random and in-batch positives were missing a strong, user-specific negative signal already present in the data. I’m doing one conservative calibration check on this winning model, then I’ll lock the configuration and refit on train+validation for the hidden submission. ### exec · 2026-09-23T22:16:07.979Z { "code": "const r = await tools.exec_command({cmd:\"PYTHONPATH=/task /opt/task-venv/bin/python - <<'PY'\\nimport pandas as pd,numpy as np\\nfrom pathlib import Path\\nfrom ranking_evaluation import CandidateSet,score_rankings\\nfrom evaluate_public import validation_truth\\nD=Path('/task/data'); cs=CandidateSet(D/'validation_eligible_candidates.npz'); truth=validation_truth(cs,set(pd.read_parquet(D/'target_users.parquet').uid.astype(int)))\\ncat=pd.read_parquet(D/'candidate_catalog.parquet'); pop=dict(zip(cat.item_id.astype(int),cat.popularity_rank.astype(int)))\\nr=pd.read_parquet('/app/solution/dislike_validation.parquet')\\nfor a in [-4,-3,-2.5,-2,-1.5,-1,-.5,0,.5]:\\n ranked={}\\n for uid,g in r.groupby('uid',sort=False):\\n old=g['rank'].to_numpy(); pr=np.array([pop[int(x)] for x in g.item_id]); key=old+a*np.log(pr)\\n ranked[int(uid)]=g.item_id.to_numpy()[np.argsort(key,kind='stable')].tolist()\\n print(a,score_rankings(ranked,truth)['quality_ndcg@10'])\\nPY\",\"workdir\":\"/app\",\"yield_time_ms\":30000,\"max_output_tokens\":4000}); text(r.output)\n" } ### Tool output · 2026-09-23T22:16:20.043Z Script completed Wall time 12.1 seconds Output: -4 0.020771 -3 0.020954 -2.5 0.021233 -2 0.021807 -1.5 0.021896 -1 0.022641 -0.5 0.022681 0 0.022728 0.5 0.02249 ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44f93af4c87d2903a18d35c3c5020", "usage": { "input_tokens": 75520, "cached_input_tokens": 75264, "cache_write_input_tokens": 0, "output_tokens": 433, "reasoning_output_tokens": 26, "total_tokens": 75953 }, "turn_token_usage": { "input_tokens": 4406828, "cached_input_tokens": 4271488, "cache_write_input_tokens": 0, "output_tokens": 16029, "reasoning_output_tokens": 5678, "total_tokens": 4422857 }, "thread_token_usage": { "input_tokens": 4406828, "cached_input_tokens": 4271488, "cache_write_input_tokens": 0, "output_tokens": 16029, "reasoning_output_tokens": 5678, "total_tokens": 4422857 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-86a16dec-7bef-498a-a378-e0856fa2027a", "process_id": "86157", "command": [ "/bin/sh", "-lc", "PYTHONPATH=/task /opt/task-venv/bin/python - <<'PY'\nimport pandas as pd,numpy as np\nfrom pathlib import Path\nfrom ranking_evaluation import CandidateSet,score_rankings\nfrom evaluate_public import validation_truth\nD=Path('/task/data'); cs=CandidateSet(D/'validation_eligible_candidates.npz'); truth=validation_truth(cs,set(pd.read_parquet(D/'target_users.parquet').uid.astype(int)))\ncat=pd.read_parquet(D/'candidate_catalog.parquet'); pop=dict(zip(cat.item_id.astype(int),cat.popularity_rank.astype(int)))\nr=pd.read_parquet('/app/solution/dislike_validation.parquet')\nfor a in [-4,-3,-2.5,-2,-1.5,-1,-.5,0,.5]:\n ranked={}\n for uid,g in r.groupby('uid',sort=False):\n old=g['rank'].to_numpy(); pr=np.array([pop[int(x)] for x in g.item_id]); key=old+a*np.log(pr)\n ranked[int(uid)]=g.item_id.to_numpy()[np.argsort(key,kind='stable')].tolist()\n print(a,score_rankings(ranked,truth)['quality_ndcg@10'])\nPY" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "PYTHONPATH=/task /opt/task-venv/bin/python - <<'PY'\nimport pandas as pd,numpy as np\nfrom pathlib import Path\nfrom ranking_evaluation import CandidateSet,score_rankings\nfrom evaluate_public import validation_truth\nD=Path('/task/data'); cs=CandidateSet(D/'validation_eligible_candidates.npz'); truth=validation_truth(cs,set(pd.read_parquet(D/'target_users.parquet').uid.astype(int)))\ncat=pd.read_parquet(D/'candidate_catalog.parquet'); pop=dict(zip(cat.item_id.astype(int),cat.popularity_rank.astype(int)))\nr=pd.read_parquet('/app/solution/dislike_validation.parquet')\nfor a in [-4,-3,-2.5,-2,-1.5,-1,-.5,0,.5]:\n ranked={}\n for uid,g in r.groupby('uid',sort=False):\n old=g['rank'].to_numpy(); pr=np.array([pop[int(x)] for x in g.item_id]); key=old+a*np.log(pr)\n ranked[int(uid)]=g.item_id.to_numpy()[np.argsort(key,kind='stable')].tolist()\n print(a,score_rankings(ranked,truth)['quality_ndcg@10'])\nPY" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "-4 0.020771\n-3 0.020954\n-2.5 0.021233\n-2 0.021807\n-1.5 0.021896\n-1 0.022641\n-0.5 0.022681\n0 0.022728\n0.5 0.02249\n", "stderr": "", "aggregated_output": "-4 0.020771\n-3 0.020954\n-2.5 0.021233\n-2 0.021807\n-1.5 0.021896\n-1 0.022641\n-0.5 0.022681\n0 0.022728\n0.5 0.02249\n", "exit_code": 0, "duration": { "secs": 11, "nanos": 895593745 }, "formatted_output": "-4 0.020771\n-3 0.020954\n-2.5 0.021233\n-2 0.021807\n-1.5 0.021896\n-1 0.022641\n-0.5 0.022681\n0 0.022728\n0.5 0.02249\n" } } ## Step 66 · agent · 2026-09-23T22:16:39.178Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:16:48.187Z { "code": "const patch = \"*** Begin Patch\\n*** Update File: /app/solution/train_current_model.py\\n@@\\n-and 24 uniform plus eight propensity-corrected unique in-batch negatives. Every\\n-selected adjacent target retains a nonzero weight. Only files under the supplied\\n-public directory are read.\\n+and 20 uniform plus eight propensity-corrected unique in-batch negatives and\\n+four active explicit-dislike negatives. Every selected adjacent target retains\\n+a nonzero weight. Only files under the supplied public directory are read.\\n@@\\n- uniform_negatives: int = 24\\n+ uniform_negatives: int = 20\\n@@\\n- explicit_dislike_negatives: int = 0\\n+ explicit_dislike_negatives: int = 4\\n@@\\n- \\\"negative_sampling\\\": (\\n- \\\"24-uniform-plus-8-propensity-corrected-inbatch\\\"\\n- ),\\n+ \\\"negative_sampling\\\": (\\n+ f\\\"{config.uniform_negatives}-uniform-plus-\\\"\\n+ f\\\"{config.inbatch_negatives}-propensity-corrected-inbatch-plus-\\\"\\n+ f\\\"{config.explicit_dislike_negatives}-active-dislike\\\"\\n+ ),\\n*** End Patch\";\ntext(await tools.apply_patch(patch));\n" } ### Tool output · 2026-09-23T22:16:48.294Z Script completed Wall time 0.0 seconds Output: {} ### Harness context { "type": "codex_item_completed", "item": { "type": "FileChange", "id": "exec-50b24535-de84-43df-abf1-862a34984e92", "changes": { "/app/solution/train_current_model.py": { "type": "update", "unified_diff": "@@ -13,5 +13,5 @@\n normalization, raw dot-product retrieval, sample-weighted binary cross entropy,\n-and 24 uniform plus eight propensity-corrected unique in-batch negatives. Every\n-selected adjacent target retains a nonzero weight. Only files under the supplied\n-public directory are read.\n+and 20 uniform plus eight propensity-corrected unique in-batch negatives and\n+four active explicit-dislike negatives. Every selected adjacent target retains\n+a nonzero weight. Only files under the supplied public directory are read.\n \"\"\"\n@@ -55,6 +55,6 @@\n loss_microbatch_size: int = 65_536\n- uniform_negatives: int = 24\n+ uniform_negatives: int = 20\n inbatch_negatives: int = 8\n hard_inbatch_pool: int = 0\n- explicit_dislike_negatives: int = 0\n+ explicit_dislike_negatives: int = 4\n inbatch_correction_power: float = 0.5\n@@ -2225,3 +2225,5 @@\n \"negative_sampling\": (\n- \"24-uniform-plus-8-propensity-corrected-inbatch\"\n+ f\"{config.uniform_negatives}-uniform-plus-\"\n+ f\"{config.inbatch_negatives}-propensity-corrected-inbatch-plus-\"\n+ f\"{config.explicit_dislike_negatives}-active-dislike\"\n ),\n", "move_path": null } }, "status": "completed", "stdout": "Success. Updated the following files:\nM /app/solution/train_current_model.py\n", "stderr": "" } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44fb4393c87d2a766769062dc3981", "usage": { "input_tokens": 76054, "cached_input_tokens": 75392, "cache_write_input_tokens": 0, "output_tokens": 654, "reasoning_output_tokens": 363, "total_tokens": 76708 }, "turn_token_usage": { "input_tokens": 4482882, "cached_input_tokens": 4346880, "cache_write_input_tokens": 0, "output_tokens": 16683, "reasoning_output_tokens": 6041, "total_tokens": 4499565 }, "thread_token_usage": { "input_tokens": 4482882, "cached_input_tokens": 4346880, "cache_write_input_tokens": 0, "output_tokens": 16683, "reasoning_output_tokens": 6041, "total_tokens": 4499565 } } ## Step 67 · agent · 2026-09-23T22:16:56.014Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:16:59.180Z { "code": "const r = await tools.exec_command({cmd:\"/opt/task-venv/bin/python /app/solution/train_current_model.py --stage submission --public-dir /task --prepared-cache /app/solution/submission_cache.npz --output /app/solution/submission.parquet --checkpoint-dir /app/solution/submission_ckpt\",\"workdir\":\"/app/solution\",\"yield_time_ms\":1000,\"max_output_tokens\":10000}); text(JSON.stringify(r))\n" } ### Tool output · 2026-09-23T22:17:00.346Z Script completed Wall time 1.2 seconds Output: {"chunk_id":"4fae43","wall_time_seconds":1.001242907,"session_id":71835,"original_token_count":0,"output":""} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44fd0a75c87d2a763a391b50c9354", "usage": { "input_tokens": 76732, "cached_input_tokens": 75904, "cache_write_input_tokens": 0, "output_tokens": 115, "reasoning_output_tokens": 8, "total_tokens": 76847 }, "turn_token_usage": { "input_tokens": 4559614, "cached_input_tokens": 4422784, "cache_write_input_tokens": 0, "output_tokens": 16798, "reasoning_output_tokens": 6049, "total_tokens": 4576412 }, "thread_token_usage": { "input_tokens": 4559614, "cached_input_tokens": 4422784, "cache_write_input_tokens": 0, "output_tokens": 16798, "reasoning_output_tokens": 6049, "total_tokens": 4576412 } } ## Step 68 · agent · 2026-09-23T22:17:02.034Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:17:03.594Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:71835,yield_time_ms:30000,max_output_tokens:8000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:17:33.603Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"7afee5","wall_time_seconds":30.001572132,"session_id":71835,"original_token_count":96} loaded explicit events: rows=746,504 users=8,307 prepared users=1,000 tokens=2,167,338 states=37,073 elapsed=5.1s prepared users=2,000 tokens=4,450,246 states=73,784 elapsed=10.4s prepared users=3,000 tokens=6,703,970 states=113,190 elapsed=15.8s prepared users=4,000 tokens=9,087,187 states=153,283 elapsed=21.5s prepared users=5,000 tokens=11,354,844 states=188,776 elapsed=26.5s ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44fdc965487d294ea325544aa2450", "usage": { "input_tokens": 76905, "cached_input_tokens": 76544, "cache_write_input_tokens": 0, "output_tokens": 59, "reasoning_output_tokens": 6, "total_tokens": 76964 }, "turn_token_usage": { "input_tokens": 4636519, "cached_input_tokens": 4499328, "cache_write_input_tokens": 0, "output_tokens": 16857, "reasoning_output_tokens": 6055, "total_tokens": 4653376 }, "thread_token_usage": { "input_tokens": 4636519, "cached_input_tokens": 4499328, "cache_write_input_tokens": 0, "output_tokens": 16857, "reasoning_output_tokens": 6055, "total_tokens": 4653376 } } ### exec · 2026-09-23T22:17:42.030Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:71835,yield_time_ms:30000,max_output_tokens:8000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:18:12.040Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"534360","wall_time_seconds":30.001553844,"session_id":71835,"original_token_count":214} prepared users=6,000 tokens=13,485,786 states=224,384 elapsed=31.5s prepared users=7,000 tokens=15,826,114 states=265,318 elapsed=37.3s prepared users=8,000 tokens=18,028,622 states=306,474 elapsed=42.9s prepared users=9,000 tokens=20,195,749 states=342,272 elapsed=47.9s target users without qualifying catalog sequence=6 prepared stage=submission sequence_users=9,153 tokens=20,712,971 next_item_targets=20,703,818 states=350,322 saved public-derived full-sequence cache: /app/solution/submission_cache.npz chronological BCE window: train=1,067,606 validation=131,997 selected=1,199,603 discarded_old_targets=19,504,215 all=20,703,818 inbatch correction: min=0.250 mean_on_targets=1.001 max=4.000 target weighting=organic-strong min=0.250 mean=0.576 max=1.000 full-history false-negative filter: users=9,153 unique_user_items=5,682,910 bytes=34,323,750 ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab44ffdd33487d292da7e53cbe83185", "usage": { "input_tokens": 77158, "cached_input_tokens": 76672, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 77209 }, "turn_token_usage": { "input_tokens": 4713677, "cached_input_tokens": 4576000, "cache_write_input_tokens": 0, "output_tokens": 16908, "reasoning_output_tokens": 6055, "total_tokens": 4730585 }, "thread_token_usage": { "input_tokens": 4713677, "cached_input_tokens": 4576000, "cache_write_input_tokens": 0, "output_tokens": 16908, "reasoning_output_tokens": 6055, "total_tokens": 4730585 } } ## Step 69 · agent · 2026-09-23T22:18:18.581Z ### Thinking unavailable — no text recorded The winning configuration is locked into the implementation defaults, and the final chronological refit is underway on `train_* + val_*`. Preparation found 9,153 sequence users and 1.07M retained fitting targets; test eligibility and test preference state are being used only at the prescribed cutoff. ### exec · 2026-09-23T22:18:21.981Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:71835,yield_time_ms:30000,max_output_tokens:8000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:18:51.989Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"3628c3","wall_time_seconds":30.000439973,"session_id":71835,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab4502439d887d2bd01c3da0e571191", "usage": { "input_tokens": 77533, "cached_input_tokens": 68736, "cache_write_input_tokens": 0, "output_tokens": 215, "reasoning_output_tokens": 96, "total_tokens": 77748 }, "turn_token_usage": { "input_tokens": 4791210, "cached_input_tokens": 4644736, "cache_write_input_tokens": 0, "output_tokens": 17123, "reasoning_output_tokens": 6151, "total_tokens": 4808333 }, "thread_token_usage": { "input_tokens": 4791210, "cached_input_tokens": 4644736, "cache_write_input_tokens": 0, "output_tokens": 17123, "reasoning_output_tokens": 6151, "total_tokens": 4808333 } } ### exec · 2026-09-23T22:18:55.080Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:71835,yield_time_ms:30000,max_output_tokens:8000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:19:25.104Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"324da6","wall_time_seconds":30.000871344,"session_id":71835,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab4504c2db087d2be125fa36b591181", "usage": { "input_tokens": 77802, "cached_input_tokens": 76928, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 77853 }, "turn_token_usage": { "input_tokens": 4869012, "cached_input_tokens": 4721664, "cache_write_input_tokens": 0, "output_tokens": 17174, "reasoning_output_tokens": 6151, "total_tokens": 4886186 }, "thread_token_usage": { "input_tokens": 4869012, "cached_input_tokens": 4721664, "cache_write_input_tokens": 0, "output_tokens": 17174, "reasoning_output_tokens": 6151, "total_tokens": 4886186 } } ### exec · 2026-09-23T22:19:33.399Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:71835,yield_time_ms:30000,max_output_tokens:8000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:20:03.433Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"c58c64","wall_time_seconds":30.001375474,"session_id":71835,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab4506d48fc87d281658f2d7b17bf14", "usage": { "input_tokens": 77906, "cached_input_tokens": 77312, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 77957 }, "turn_token_usage": { "input_tokens": 4946918, "cached_input_tokens": 4798976, "cache_write_input_tokens": 0, "output_tokens": 17225, "reasoning_output_tokens": 6151, "total_tokens": 4964143 }, "thread_token_usage": { "input_tokens": 4946918, "cached_input_tokens": 4798976, "cache_write_input_tokens": 0, "output_tokens": 17225, "reasoning_output_tokens": 6151, "total_tokens": 4964143 } } ### exec · 2026-09-23T22:20:07.635Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:71835,yield_time_ms:30000,max_output_tokens:8000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:20:37.670Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"cf1376","wall_time_seconds":30.001072705,"session_id":71835,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab45093afc487d29fd3301597ef9360", "usage": { "input_tokens": 78011, "cached_input_tokens": 77696, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 78062 }, "turn_token_usage": { "input_tokens": 5024929, "cached_input_tokens": 4876672, "cache_write_input_tokens": 0, "output_tokens": 17276, "reasoning_output_tokens": 6151, "total_tokens": 5042205 }, "thread_token_usage": { "input_tokens": 5024929, "cached_input_tokens": 4876672, "cache_write_input_tokens": 0, "output_tokens": 17276, "reasoning_output_tokens": 6151, "total_tokens": 5042205 } } ## Step 70 · agent · 2026-09-23T22:20:39.793Z ### Thinking unavailable — no text recorded Final training is still CPU-bound but progressing normally; no fallback or boundary changes have been made. The explicit-dislike sampler keeps the same 32-negative budget, so the public gain does not come from extra model capacity or a larger serving computation. ### exec · 2026-09-23T22:20:43.003Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:71835,yield_time_ms:30000,max_output_tokens:8000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:21:13.012Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"f5b9be","wall_time_seconds":30.001478332,"session_id":71835,"original_token_count":0} ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab450b5e81487d29a5253b8e954f005", "usage": { "input_tokens": 78115, "cached_input_tokens": 77824, "cache_write_input_tokens": 0, "output_tokens": 129, "reasoning_output_tokens": 20, "total_tokens": 78244 }, "turn_token_usage": { "input_tokens": 5103044, "cached_input_tokens": 4954496, "cache_write_input_tokens": 0, "output_tokens": 17405, "reasoning_output_tokens": 6171, "total_tokens": 5120449 }, "thread_token_usage": { "input_tokens": 5103044, "cached_input_tokens": 4954496, "cache_write_input_tokens": 0, "output_tokens": 17405, "reasoning_output_tokens": 6171, "total_tokens": 5120449 } } ### exec · 2026-09-23T22:22:27.659Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:71835,yield_time_ms:30000,max_output_tokens:8000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:22:57.688Z Script completed Wall time 30.0 seconds Output: {"chunk_id":"152f7c","wall_time_seconds":30.002907414,"session_id":71835,"original_token_count":98} epoch=1/1 batches=250 targets=994,228 batch_bce=0.450923 running_bce=0.545088 elapsed=208.4s saved epoch checkpoint: /app/solution/submission_ckpt/epoch-01.pt epoch=1/1 train_loss=0.54204 validation_loss=0.51389 pair_accuracy=0.750 train_targets=1,067,606 validation_targets=131,997 train_seconds=223.6 validation_seconds=16.6 restored best validation-BCE checkpoint: epoch=1 loss=0.513895 ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab450d9369487d28d3cb98f2d6732e3", "usage": { "input_tokens": 78299, "cached_input_tokens": 77952, "cache_write_input_tokens": 0, "output_tokens": 51, "reasoning_output_tokens": 0, "total_tokens": 78350 }, "turn_token_usage": { "input_tokens": 5181343, "cached_input_tokens": 5032448, "cache_write_input_tokens": 0, "output_tokens": 17456, "reasoning_output_tokens": 6171, "total_tokens": 5198799 }, "thread_token_usage": { "input_tokens": 5181343, "cached_input_tokens": 5032448, "cache_write_input_tokens": 0, "output_tokens": 17456, "reasoning_output_tokens": 6171, "total_tokens": 5198799 } } ## Step 71 · agent · 2026-09-23T22:23:04.217Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:23:05.622Z { "code": "let{output,...rest}=await tools.write_stdin({session_id:71835,yield_time_ms:30000,max_output_tokens:8000,chars:\"\"});text(rest);text(output)\n" } ### Tool output · 2026-09-23T22:23:30.631Z Script completed Wall time 25.0 seconds Output: {"chunk_id":"53b3dd","wall_time_seconds":24.987138579,"exit_code":0,"original_token_count":822} ranked users=1,024/8,456 ranked users=2,048/8,456 ranked users=3,072/8,456 ranked users=4,096/8,456 ranked users=5,120/8,456 ranked users=6,144/8,456 ranked users=7,168/8,456 ranked users=8,192/8,456 ranked users=8,456/8,456 { "baseline": "yambda-windowed-sequence-two-tower-base", "stage": "submission", "output": "/app/solution/submission.parquet", "rows": 845600, "users": 8456, "runtime_seconds": 386.722, "public_inputs_only": true, "architecture": { "family": "pure-windowed-sequence-two-tower", "sequence_training": "every-adjacent-target-within-recent-chronological-window", "sequence_encoder": "one-layer-GRU-dense-timestep-loss", "bptt_hidden_state": "carried-and-detached", "model_selection": "chronological-validation-BCE-early-stopping", "loss_execution": "gradient-accumulated-microbatches", "user_id_embedding": false, "user_mlp": "582-512-256-192", "item_mlp": "196-512-256-192", "normalization": "none", "score": "raw-dot-product", "objective": "sample-weighted-BCE-at-every-timestep", "negative_sampling": "20-uniform-plus-8-propensity-corrected-inbatch-plus-4-active-dislike", "false_negative_filter": "full-training-history", "target_weighting": "organic-strong" }, "config": { "bptt_steps": 100, "user_batch_size": 64, "embedding_dim": 192, "hidden_dim": 192, "user_hidden_1": 512, "user_hidden_2": 256, "item_hidden_1": 512, "item_hidden_2": 256, "dropout": 0.05, "epochs": 1, "learning_rate": 0.001, "weight_decay": 1e-05, "gradient_clip": 2.0, "loss_microbatch_size": 65536, "uniform_negatives": 20, "inbatch_negatives": 8, "hard_inbatch_pool": 0, "explicit_dislike_negatives": 4, "inbatch_correction_power": 0.5, "inbatch_correction_min": 0.25, "inbatch_correction_max": 4.0, "negative_filter_scope": "full-training-history", "target_weighting": "organic-strong", "ordinary_target_weight": 0.25, "organic_strong_target_weight": 1.0, "organic_like_target_weight": 3.0, "discovery_horizon_days": 7, "validation_fraction": 0.1, "max_train_targets_per_user": 128, "max_validation_targets_per_user": 16, "early_stopping_patience": 1, "early_stopping_min_delta": 0.0001, "seed": 29 }, "sequence_tokens": 20712971, "all_next_item_targets": 20703818, "selected_training_targets": 1067606, "selected_validation_targets": 131997, "discarded_old_targets": 19504215, "training_history": [ { "epoch": 1.0, "loss": 0.5420389850018956, "positive_logit": 0.7137372304952996, "negative_logit": -0.6100685399287236, "pair_accuracy": 0.7496312134345442, "targets": 1067606.0, "target_weight_sum": 641383.25, "batches": 270.0, "seconds": 223.57914762099972, "validation_loss": 0.5138947610125114, "validation_targets": 131997.0, "validation_target_weight_sum": 80328.75, "validation_seconds": 16.634983160000047 } ], "embedding_diagnostics": { "query_norm_mean": 1.431365728378296, "query_norm_std": 0.7025898694992065, "item_norm_mean": 1.9501971006393433, "item_norm_std": 0.9332084059715271 }, "torch_version": "2.8.0+cpu", "device": "cpu" } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab45141e70087d28917154508365588", "usage": { "input_tokens": 78528, "cached_input_tokens": 78080, "cache_write_input_tokens": 0, "output_tokens": 59, "reasoning_output_tokens": 6, "total_tokens": 78587 }, "turn_token_usage": { "input_tokens": 5259871, "cached_input_tokens": 5110528, "cache_write_input_tokens": 0, "output_tokens": 17515, "reasoning_output_tokens": 6177, "total_tokens": 5277386 }, "thread_token_usage": { "input_tokens": 5259871, "cached_input_tokens": 5110528, "cache_write_input_tokens": 0, "output_tokens": 17515, "reasoning_output_tokens": 6177, "total_tokens": 5277386 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-f1c7ef9e-a562-4399-ba7f-5a8c96a2dc9b", "process_id": "71835", "command": [ "/bin/sh", "-lc", "/opt/task-venv/bin/python /app/solution/train_current_model.py --stage submission --public-dir /task --prepared-cache /app/solution/submission_cache.npz --output /app/solution/submission.parquet --checkpoint-dir /app/solution/submission_ckpt" ], "cwd": "file:///app/solution", "parsed_cmd": [ { "type": "unknown", "cmd": "/opt/task-venv/bin/python /app/solution/train_current_model.py --stage submission --public-dir /task --prepared-cache /app/solution/submission_cache.npz --output /app/solution/submission.parquet --checkpoint-dir /app/solution/submission_ckpt" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "loaded explicit events: rows=746,504 users=8,307\nprepared users=1,000 tokens=2,167,338 states=37,073 elapsed=5.1s\nprepared users=2,000 tokens=4,450,246 states=73,784 elapsed=10.4s\nprepared users=3,000 tokens=6,703,970 states=113,190 elapsed=15.8s\nprepared users=4,000 tokens=9,087,187 states=153,283 elapsed=21.5s\nprepared users=5,000 tokens=11,354,844 states=188,776 elapsed=26.5s\nprepared users=6,000 tokens=13,485,786 states=224,384 elapsed=31.5s\nprepared users=7,000 tokens=15,826,114 states=265,318 elapsed=37.3s\nprepared users=8,000 tokens=18,028,622 states=306,474 elapsed=42.9s\nprepared users=9,000 tokens=20,195,749 states=342,272 elapsed=47.9s\ntarget users without qualifying catalog sequence=6\nprepared stage=submission sequence_users=9,153 tokens=20,712,971 next_item_targets=20,703,818 states=350,322\nsaved public-derived full-sequence cache: /app/solution/submission_cache.npz\nchronological BCE window: train=1,067,606 validation=131,997 selected=1,199,603 discarded_old_targets=19,504,215 all=20,703,818\ninbatch correction: min=0.250 mean_on_targets=1.001 max=4.000\ntarget weighting=organic-strong min=0.250 mean=0.576 max=1.000\nfull-history false-negative filter: users=9,153 unique_user_items=5,682,910 bytes=34,323,750\nepoch=1/1 batches=250 targets=994,228 batch_bce=0.450923 running_bce=0.545088 elapsed=208.4s\nsaved epoch checkpoint: /app/solution/submission_ckpt/epoch-01.pt\nepoch=1/1 train_loss=0.54204 validation_loss=0.51389 pair_accuracy=0.750 train_targets=1,067,606 validation_targets=131,997 train_seconds=223.6 validation_seconds=16.6\nrestored best validation-BCE checkpoint: epoch=1 loss=0.513895\nranked users=1,024/8,456\nranked users=2,048/8,456\nranked users=3,072/8,456\nranked users=4,096/8,456\nranked users=5,120/8,456\nranked users=6,144/8,456\nranked users=7,168/8,456\nranked users=8,192/8,456\nranked users=8,456/8,456\n{\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": \"submission\",\n \"output\": \"/app/solution/submission.parquet\",\n \"rows\": 845600,\n \"users\": 8456,\n \"runtime_seconds\": 386.722,\n \"public_inputs_only\": true,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": \"every-adjacent-target-within-recent-chronological-window\",\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": false,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": \"20-uniform-plus-8-propensity-corrected-inbatch-plus-4-active-dislike\",\n \"false_negative_filter\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\"\n },\n \"config\": {\n \"bptt_steps\": 100,\n \"user_batch_size\": 64,\n \"embedding_dim\": 192,\n \"hidden_dim\": 192,\n \"user_hidden_1\": 512,\n \"user_hidden_2\": 256,\n \"item_hidden_1\": 512,\n \"item_hidden_2\": 256,\n \"dropout\": 0.05,\n \"epochs\": 1,\n \"learning_rate\": 0.001,\n \"weight_decay\": 1e-05,\n \"gradient_clip\": 2.0,\n \"loss_microbatch_size\": 65536,\n \"uniform_negatives\": 20,\n \"inbatch_negatives\": 8,\n \"hard_inbatch_pool\": 0,\n \"explicit_dislike_negatives\": 4,\n \"inbatch_correction_power\": 0.5,\n \"inbatch_correction_min\": 0.25,\n \"inbatch_correction_max\": 4.0,\n \"negative_filter_scope\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\",\n \"ordinary_target_weight\": 0.25,\n \"organic_strong_target_weight\": 1.0,\n \"organic_like_target_weight\": 3.0,\n \"discovery_horizon_days\": 7,\n \"validation_fraction\": 0.1,\n \"max_train_targets_per_user\": 128,\n \"max_validation_targets_per_user\": 16,\n \"early_stopping_patience\": 1,\n \"early_stopping_min_delta\": 0.0001,\n \"seed\": 29\n },\n \"sequence_tokens\": 20712971,\n \"all_next_item_targets\": 20703818,\n \"selected_training_targets\": 1067606,\n \"selected_validation_targets\": 131997,\n \"discarded_old_targets\": 19504215,\n \"training_history\": [\n {\n \"epoch\": 1.0,\n \"loss\": 0.5420389850018956,\n \"positive_logit\": 0.7137372304952996,\n \"negative_logit\": -0.6100685399287236,\n \"pair_accuracy\": 0.7496312134345442,\n \"targets\": 1067606.0,\n \"target_weight_sum\": 641383.25,\n \"batches\": 270.0,\n \"seconds\": 223.57914762099972,\n \"validation_loss\": 0.5138947610125114,\n \"validation_targets\": 131997.0,\n \"validation_target_weight_sum\": 80328.75,\n \"validation_seconds\": 16.634983160000047\n }\n ],\n \"embedding_diagnostics\": {\n \"query_norm_mean\": 1.431365728378296,\n \"query_norm_std\": 0.7025898694992065,\n \"item_norm_mean\": 1.9501971006393433,\n \"item_norm_std\": 0.9332084059715271\n },\n \"torch_version\": \"2.8.0+cpu\",\n \"device\": \"cpu\"\n}\n", "stderr": "", "aggregated_output": "loaded explicit events: rows=746,504 users=8,307\nprepared users=1,000 tokens=2,167,338 states=37,073 elapsed=5.1s\nprepared users=2,000 tokens=4,450,246 states=73,784 elapsed=10.4s\nprepared users=3,000 tokens=6,703,970 states=113,190 elapsed=15.8s\nprepared users=4,000 tokens=9,087,187 states=153,283 elapsed=21.5s\nprepared users=5,000 tokens=11,354,844 states=188,776 elapsed=26.5s\nprepared users=6,000 tokens=13,485,786 states=224,384 elapsed=31.5s\nprepared users=7,000 tokens=15,826,114 states=265,318 elapsed=37.3s\nprepared users=8,000 tokens=18,028,622 states=306,474 elapsed=42.9s\nprepared users=9,000 tokens=20,195,749 states=342,272 elapsed=47.9s\ntarget users without qualifying catalog sequence=6\nprepared stage=submission sequence_users=9,153 tokens=20,712,971 next_item_targets=20,703,818 states=350,322\nsaved public-derived full-sequence cache: /app/solution/submission_cache.npz\nchronological BCE window: train=1,067,606 validation=131,997 selected=1,199,603 discarded_old_targets=19,504,215 all=20,703,818\ninbatch correction: min=0.250 mean_on_targets=1.001 max=4.000\ntarget weighting=organic-strong min=0.250 mean=0.576 max=1.000\nfull-history false-negative filter: users=9,153 unique_user_items=5,682,910 bytes=34,323,750\nepoch=1/1 batches=250 targets=994,228 batch_bce=0.450923 running_bce=0.545088 elapsed=208.4s\nsaved epoch checkpoint: /app/solution/submission_ckpt/epoch-01.pt\nepoch=1/1 train_loss=0.54204 validation_loss=0.51389 pair_accuracy=0.750 train_targets=1,067,606 validation_targets=131,997 train_seconds=223.6 validation_seconds=16.6\nrestored best validation-BCE checkpoint: epoch=1 loss=0.513895\nranked users=1,024/8,456\nranked users=2,048/8,456\nranked users=3,072/8,456\nranked users=4,096/8,456\nranked users=5,120/8,456\nranked users=6,144/8,456\nranked users=7,168/8,456\nranked users=8,192/8,456\nranked users=8,456/8,456\n{\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": \"submission\",\n \"output\": \"/app/solution/submission.parquet\",\n \"rows\": 845600,\n \"users\": 8456,\n \"runtime_seconds\": 386.722,\n \"public_inputs_only\": true,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": \"every-adjacent-target-within-recent-chronological-window\",\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": false,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": \"20-uniform-plus-8-propensity-corrected-inbatch-plus-4-active-dislike\",\n \"false_negative_filter\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\"\n },\n \"config\": {\n \"bptt_steps\": 100,\n \"user_batch_size\": 64,\n \"embedding_dim\": 192,\n \"hidden_dim\": 192,\n \"user_hidden_1\": 512,\n \"user_hidden_2\": 256,\n \"item_hidden_1\": 512,\n \"item_hidden_2\": 256,\n \"dropout\": 0.05,\n \"epochs\": 1,\n \"learning_rate\": 0.001,\n \"weight_decay\": 1e-05,\n \"gradient_clip\": 2.0,\n \"loss_microbatch_size\": 65536,\n \"uniform_negatives\": 20,\n \"inbatch_negatives\": 8,\n \"hard_inbatch_pool\": 0,\n \"explicit_dislike_negatives\": 4,\n \"inbatch_correction_power\": 0.5,\n \"inbatch_correction_min\": 0.25,\n \"inbatch_correction_max\": 4.0,\n \"negative_filter_scope\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\",\n \"ordinary_target_weight\": 0.25,\n \"organic_strong_target_weight\": 1.0,\n \"organic_like_target_weight\": 3.0,\n \"discovery_horizon_days\": 7,\n \"validation_fraction\": 0.1,\n \"max_train_targets_per_user\": 128,\n \"max_validation_targets_per_user\": 16,\n \"early_stopping_patience\": 1,\n \"early_stopping_min_delta\": 0.0001,\n \"seed\": 29\n },\n \"sequence_tokens\": 20712971,\n \"all_next_item_targets\": 20703818,\n \"selected_training_targets\": 1067606,\n \"selected_validation_targets\": 131997,\n \"discarded_old_targets\": 19504215,\n \"training_history\": [\n {\n \"epoch\": 1.0,\n \"loss\": 0.5420389850018956,\n \"positive_logit\": 0.7137372304952996,\n \"negative_logit\": -0.6100685399287236,\n \"pair_accuracy\": 0.7496312134345442,\n \"targets\": 1067606.0,\n \"target_weight_sum\": 641383.25,\n \"batches\": 270.0,\n \"seconds\": 223.57914762099972,\n \"validation_loss\": 0.5138947610125114,\n \"validation_targets\": 131997.0,\n \"validation_target_weight_sum\": 80328.75,\n \"validation_seconds\": 16.634983160000047\n }\n ],\n \"embedding_diagnostics\": {\n \"query_norm_mean\": 1.431365728378296,\n \"query_norm_std\": 0.7025898694992065,\n \"item_norm_mean\": 1.9501971006393433,\n \"item_norm_std\": 0.9332084059715271\n },\n \"torch_version\": \"2.8.0+cpu\",\n \"device\": \"cpu\"\n}\n", "exit_code": 0, "duration": { "secs": 391, "nanos": 284683333 }, "formatted_output": "loaded explicit events: rows=746,504 users=8,307\nprepared users=1,000 tokens=2,167,338 states=37,073 elapsed=5.1s\nprepared users=2,000 tokens=4,450,246 states=73,784 elapsed=10.4s\nprepared users=3,000 tokens=6,703,970 states=113,190 elapsed=15.8s\nprepared users=4,000 tokens=9,087,187 states=153,283 elapsed=21.5s\nprepared users=5,000 tokens=11,354,844 states=188,776 elapsed=26.5s\nprepared users=6,000 tokens=13,485,786 states=224,384 elapsed=31.5s\nprepared users=7,000 tokens=15,826,114 states=265,318 elapsed=37.3s\nprepared users=8,000 tokens=18,028,622 states=306,474 elapsed=42.9s\nprepared users=9,000 tokens=20,195,749 states=342,272 elapsed=47.9s\ntarget users without qualifying catalog sequence=6\nprepared stage=submission sequence_users=9,153 tokens=20,712,971 next_item_targets=20,703,818 states=350,322\nsaved public-derived full-sequence cache: /app/solution/submission_cache.npz\nchronological BCE window: train=1,067,606 validation=131,997 selected=1,199,603 discarded_old_targets=19,504,215 all=20,703,818\ninbatch correction: min=0.250 mean_on_targets=1.001 max=4.000\ntarget weighting=organic-strong min=0.250 mean=0.576 max=1.000\nfull-history false-negative filter: users=9,153 unique_user_items=5,682,910 bytes=34,323,750\nepoch=1/1 batches=250 targets=994,228 batch_bce=0.450923 running_bce=0.545088 elapsed=208.4s\nsaved epoch checkpoint: /app/solution/submission_ckpt/epoch-01.pt\nepoch=1/1 train_loss=0.54204 validation_loss=0.51389 pair_accuracy=0.750 train_targets=1,067,606 validation_targets=131,997 train_seconds=223.6 validation_seconds=16.6\nrestored best validation-BCE checkpoint: epoch=1 loss=0.513895\nranked users=1,024/8,456\nranked users=2,048/8,456\nranked users=3,072/8,456\nranked users=4,096/8,456\nranked users=5,120/8,456\nranked users=6,144/8,456\nranked users=7,168/8,456\nranked users=8,192/8,456\nranked users=8,456/8,456\n{\n \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n \"stage\": \"submission\",\n \"output\": \"/app/solution/submission.parquet\",\n \"rows\": 845600,\n \"users\": 8456,\n \"runtime_seconds\": 386.722,\n \"public_inputs_only\": true,\n \"architecture\": {\n \"family\": \"pure-windowed-sequence-two-tower\",\n \"sequence_training\": \"every-adjacent-target-within-recent-chronological-window\",\n \"sequence_encoder\": \"one-layer-GRU-dense-timestep-loss\",\n \"bptt_hidden_state\": \"carried-and-detached\",\n \"model_selection\": \"chronological-validation-BCE-early-stopping\",\n \"loss_execution\": \"gradient-accumulated-microbatches\",\n \"user_id_embedding\": false,\n \"user_mlp\": \"582-512-256-192\",\n \"item_mlp\": \"196-512-256-192\",\n \"normalization\": \"none\",\n \"score\": \"raw-dot-product\",\n \"objective\": \"sample-weighted-BCE-at-every-timestep\",\n \"negative_sampling\": \"20-uniform-plus-8-propensity-corrected-inbatch-plus-4-active-dislike\",\n \"false_negative_filter\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\"\n },\n \"config\": {\n \"bptt_steps\": 100,\n \"user_batch_size\": 64,\n \"embedding_dim\": 192,\n \"hidden_dim\": 192,\n \"user_hidden_1\": 512,\n \"user_hidden_2\": 256,\n \"item_hidden_1\": 512,\n \"item_hidden_2\": 256,\n \"dropout\": 0.05,\n \"epochs\": 1,\n \"learning_rate\": 0.001,\n \"weight_decay\": 1e-05,\n \"gradient_clip\": 2.0,\n \"loss_microbatch_size\": 65536,\n \"uniform_negatives\": 20,\n \"inbatch_negatives\": 8,\n \"hard_inbatch_pool\": 0,\n \"explicit_dislike_negatives\": 4,\n \"inbatch_correction_power\": 0.5,\n \"inbatch_correction_min\": 0.25,\n \"inbatch_correction_max\": 4.0,\n \"negative_filter_scope\": \"full-training-history\",\n \"target_weighting\": \"organic-strong\",\n \"ordinary_target_weight\": 0.25,\n \"organic_strong_target_weight\": 1.0,\n \"organic_like_target_weight\": 3.0,\n \"discovery_horizon_days\": 7,\n \"validation_fraction\": 0.1,\n \"max_train_targets_per_user\": 128,\n \"max_validation_targets_per_user\": 16,\n \"early_stopping_patience\": 1,\n \"early_stopping_min_delta\": 0.0001,\n \"seed\": 29\n },\n \"sequence_tokens\": 20712971,\n \"all_next_item_targets\": 20703818,\n \"selected_training_targets\": 1067606,\n \"selected_validation_targets\": 131997,\n \"discarded_old_targets\": 19504215,\n \"training_history\": [\n {\n \"epoch\": 1.0,\n \"loss\": 0.5420389850018956,\n \"positive_logit\": 0.7137372304952996,\n \"negative_logit\": -0.6100685399287236,\n \"pair_accuracy\": 0.7496312134345442,\n \"targets\": 1067606.0,\n \"target_weight_sum\": 641383.25,\n \"batches\": 270.0,\n \"seconds\": 223.57914762099972,\n \"validation_loss\": 0.5138947610125114,\n \"validation_targets\": 131997.0,\n \"validation_target_weight_sum\": 80328.75,\n \"validation_seconds\": 16.634983160000047\n }\n ],\n \"embedding_diagnostics\": {\n \"query_norm_mean\": 1.431365728378296,\n \"query_norm_std\": 0.7025898694992065,\n \"item_norm_mean\": 1.9501971006393433,\n \"item_norm_std\": 0.9332084059715271\n },\n \"torch_version\": \"2.8.0+cpu\",\n \"device\": \"cpu\"\n}\n" } } ## Step 72 · agent · 2026-09-23T22:23:43.782Z ### Thinking unavailable — no text recorded The final refit completed and `/app/solution/submission.parquet` now exists with 845,600 rows for all 8,456 targets. I’m performing an independent schema, rank, distinctness, exact-user, and per-user test-eligibility audit now, then I’ll finish the experiment record and small sampler tests. ### exec · 2026-09-23T22:23:56.460Z { "code": "const r = await tools.exec_command({cmd:\"PYTHONPATH=/task /opt/task-venv/bin/python - <<'PY'\\nfrom pathlib import Path\\nimport numpy as np,pandas as pd\\nfrom ranking_evaluation import CandidateSet,validate_ranking\\np=Path('/app/solution/submission.parquet')\\nassert p.is_file() and not p.is_symlink()\\nr=pd.read_parquet(p)\\ntargets=set(pd.read_parquet('/task/data/target_users.parquet').uid.astype(int))\\nr=validate_ranking(r,targets)\\nc=CandidateSet(Path('/task/data/test_eligible_candidates.npz'))\\nbad=[(int(u),int(i)) for u,i in r[['uid','item_id']].itertuples(index=False,name=None) if not c.is_eligible(int(u),int(i))]\\nassert not bad, bad[:5]\\nassert list(r.columns)==['uid','item_id','rank']\\nassert all(np.issubdtype(r[x].dtype,np.integer) for x in r.columns)\\nprint({'regular_file':True,'rows':len(r),'users':r.uid.nunique(),'eligible_rows':len(r),'bytes':p.stat().st_size})\\nPY\\n/opt/task-venv/bin/python /task/evaluate_public.py /app/solution/dislike_validation.parquet\\nsha256sum /app/solution/submission.parquet\",\"workdir\":\"/app\",\"yield_time_ms\":30000,\"max_output_tokens\":5000}); text(r.output)\n" } ### Tool output · 2026-09-23T22:24:02.765Z Script completed Wall time 6.3 seconds Output: {'regular_file': True, 'rows': 845600, 'users': 8456, 'eligible_rows': 845600, 'bytes': 1216275} { "model": "/app/solution/dislike_validation.parquet", "scores": { "quality_ndcg@10": 0.022728, "quality_users": 4263 } } eb01a748be78d31eaa161a8dd08ba70afd611b42837497de05a902a060586cbd /app/solution/submission.parquet ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab45162d08c87d2ae1b8cbd46c35d4f", "usage": { "input_tokens": 79726, "cached_input_tokens": 78336, "cache_write_input_tokens": 0, "output_tokens": 598, "reasoning_output_tokens": 190, "total_tokens": 80324 }, "turn_token_usage": { "input_tokens": 5339597, "cached_input_tokens": 5188864, "cache_write_input_tokens": 0, "output_tokens": 18113, "reasoning_output_tokens": 6367, "total_tokens": 5357710 }, "thread_token_usage": { "input_tokens": 5339597, "cached_input_tokens": 5188864, "cache_write_input_tokens": 0, "output_tokens": 18113, "reasoning_output_tokens": 6367, "total_tokens": 5357710 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-71c1e5b9-9760-48a9-a473-4c2ccb2e0adc", "process_id": "52717", "command": [ "/bin/sh", "-lc", "PYTHONPATH=/task /opt/task-venv/bin/python - <<'PY'\nfrom pathlib import Path\nimport numpy as np,pandas as pd\nfrom ranking_evaluation import CandidateSet,validate_ranking\np=Path('/app/solution/submission.parquet')\nassert p.is_file() and not p.is_symlink()\nr=pd.read_parquet(p)\ntargets=set(pd.read_parquet('/task/data/target_users.parquet').uid.astype(int))\nr=validate_ranking(r,targets)\nc=CandidateSet(Path('/task/data/test_eligible_candidates.npz'))\nbad=[(int(u),int(i)) for u,i in r[['uid','item_id']].itertuples(index=False,name=None) if not c.is_eligible(int(u),int(i))]\nassert not bad, bad[:5]\nassert list(r.columns)==['uid','item_id','rank']\nassert all(np.issubdtype(r[x].dtype,np.integer) for x in r.columns)\nprint({'regular_file':True,'rows':len(r),'users':r.uid.nunique(),'eligible_rows':len(r),'bytes':p.stat().st_size})\nPY\n/opt/task-venv/bin/python /task/evaluate_public.py /app/solution/dislike_validation.parquet\nsha256sum /app/solution/submission.parquet" ], "cwd": "file:///app", "parsed_cmd": [ { "type": "unknown", "cmd": "PYTHONPATH=/task /opt/task-venv/bin/python - <<'PY'\nfrom pathlib import Path\nimport numpy as np,pandas as pd\nfrom ranking_evaluation import CandidateSet,validate_ranking\np=Path('/app/solution/submission.parquet')\nassert p.is_file() and not p.is_symlink()\nr=pd.read_parquet(p)\ntargets=set(pd.read_parquet('/task/data/target_users.parquet').uid.astype(int))\nr=validate_ranking(r,targets)\nc=CandidateSet(Path('/task/data/test_eligible_candidates.npz'))\nbad=[(int(u),int(i)) for u,i in r[['uid','item_id']].itertuples(index=False,name=None) if not c.is_eligible(int(u),int(i))]\nassert not bad, bad[:5]\nassert list(r.columns)==['uid','item_id','rank']\nassert all(np.issubdtype(r[x].dtype,np.integer) for x in r.columns)\nprint({'regular_file':True,'rows':len(r),'users':r.uid.nunique(),'eligible_rows':len(r),'bytes':p.stat().st_size})\nPY\n/opt/task-venv/bin/python /task/evaluate_public.py /app/solution/dislike_validation.parquet\nsha256sum /app/solution/submission.parquet" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "{'regular_file': True, 'rows': 845600, 'users': 8456, 'eligible_rows': 845600, 'bytes': 1216275}\n{\n \"model\": \"/app/solution/dislike_validation.parquet\",\n \"scores\": {\n \"quality_ndcg@10\": 0.022728,\n \"quality_users\": 4263\n }\n}\neb01a748be78d31eaa161a8dd08ba70afd611b42837497de05a902a060586cbd /app/solution/submission.parquet\n", "stderr": "", "aggregated_output": "{'regular_file': True, 'rows': 845600, 'users': 8456, 'eligible_rows': 845600, 'bytes': 1216275}\n{\n \"model\": \"/app/solution/dislike_validation.parquet\",\n \"scores\": {\n \"quality_ndcg@10\": 0.022728,\n \"quality_users\": 4263\n }\n}\neb01a748be78d31eaa161a8dd08ba70afd611b42837497de05a902a060586cbd /app/solution/submission.parquet\n", "exit_code": 0, "duration": { "secs": 6, "nanos": 124235728 }, "formatted_output": "{'regular_file': True, 'rows': 845600, 'users': 8456, 'eligible_rows': 845600, 'bytes': 1216275}\n{\n \"model\": \"/app/solution/dislike_validation.parquet\",\n \"scores\": {\n \"quality_ndcg@10\": 0.022728,\n \"quality_users\": 4263\n }\n}\neb01a748be78d31eaa161a8dd08ba70afd611b42837497de05a902a060586cbd /app/solution/submission.parquet\n" } } ## Step 73 · agent · 2026-09-23T22:24:16.510Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:24:25.450Z { "code": "const patch = \"*** Begin Patch\\n*** Update File: /app/solution/train_current_model.py\\n@@\\n pool_start = config.uniform_negatives\\n- pool_size = logits.shape[1] - pool_start\\n+ pool_size = max(config.inbatch_negatives, config.hard_inbatch_pool)\\n if config.hard_inbatch_pool:\\n if pool_size < config.inbatch_negatives:\\n raise RuntimeError(\\\"hard-negative proposal pool is too small\\\")\\n+ pool_logits = logits[:, pool_start : pool_start + pool_size]\\n+ pool_raw = raw[:, pool_start : pool_start + pool_size]\\n+ pool_weights = correction[:, pool_start : pool_start + pool_size]\\n columns = torch.topk(\\n- logits[:, pool_start:], k=config.inbatch_negatives, dim=1\\n+ pool_logits, k=config.inbatch_negatives, dim=1\\n ).indices\\n- selected_raw = raw[:, pool_start:].gather(1, columns)\\n- weights = correction[:, pool_start:].gather(1, columns)\\n+ selected_raw = pool_raw.gather(1, columns)\\n+ weights = pool_weights.gather(1, columns)\\n*** End Patch\";\ntext(await tools.apply_patch(patch));\n" } ### Tool output · 2026-09-23T22:24:25.568Z Script completed Wall time 0.0 seconds Output: {} ### Harness context { "type": "codex_item_completed", "item": { "type": "FileChange", "id": "exec-a905fe5e-339c-465e-84f7-ca66b72a1c1a", "changes": { "/app/solution/train_current_model.py": { "type": "update", "unified_diff": "@@ -885,3 +885,3 @@\n pool_start = config.uniform_negatives\n- pool_size = logits.shape[1] - pool_start\n+ pool_size = max(config.inbatch_negatives, config.hard_inbatch_pool)\n if config.hard_inbatch_pool:\n@@ -889,7 +889,10 @@\n raise RuntimeError(\"hard-negative proposal pool is too small\")\n+ pool_logits = logits[:, pool_start : pool_start + pool_size]\n+ pool_raw = raw[:, pool_start : pool_start + pool_size]\n+ pool_weights = correction[:, pool_start : pool_start + pool_size]\n columns = torch.topk(\n- logits[:, pool_start:], k=config.inbatch_negatives, dim=1\n+ pool_logits, k=config.inbatch_negatives, dim=1\n ).indices\n- selected_raw = raw[:, pool_start:].gather(1, columns)\n- weights = correction[:, pool_start:].gather(1, columns)\n+ selected_raw = pool_raw.gather(1, columns)\n+ weights = pool_weights.gather(1, columns)\n else:\n", "move_path": null } }, "status": "completed", "stdout": "Success. Updated the following files:\nM /app/solution/train_current_model.py\n", "stderr": "" } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab45182f48c87d2b293ff7a6771efa4", "usage": { "input_tokens": 80471, "cached_input_tokens": 77568, "cache_write_input_tokens": 0, "output_tokens": 519, "reasoning_output_tokens": 231, "total_tokens": 80990 }, "turn_token_usage": { "input_tokens": 5420068, "cached_input_tokens": 5266432, "cache_write_input_tokens": 0, "output_tokens": 18632, "reasoning_output_tokens": 6598, "total_tokens": 5438700 }, "thread_token_usage": { "input_tokens": 5420068, "cached_input_tokens": 5266432, "cache_write_input_tokens": 0, "output_tokens": 18632, "reasoning_output_tokens": 6598, "total_tokens": 5438700 } } ## Step 74 · agent · 2026-09-23T22:24:31.396Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:25:03.964Z { "code": "const patch = \"*** Begin Patch\\n*** Update File: /app/solution/train_current_model.py\\n@@\\n- \\\"baseline\\\": \\\"yambda-windowed-sequence-two-tower-base\\\",\\n+ \\\"model\\\": \\\"yambda-windowed-sequence-two-tower-explicit-negatives\\\",\\n*** Add File: /app/solution/README.md\\n+# Improved discovery two-tower\\n+\\n+## Result\\n+\\n+Public validation NDCG@10 improved from **0.021280** (production) to\\n+**0.022728** (+6.8%) on the unchanged chronological validation boundary.\\n+\\n+## Diagnosis and change\\n+\\n+The production objective spends 24 of 32 negative slots on catalog-uniform\\n+tracks, which are usually easy tail negatives. Its remaining eight in-batch\\n+negatives are useful but are sampled from positive targets and frequency\\n+corrected. Neither source deliberately trains on the strongest user-specific\\n+negative evidence already available: active explicit dislikes. In the retained\\n+training contexts, about half of rows have at least one active dislike, so\\n+uniform sampling almost never uses a plentiful signal.\\n+\\n+The improved sampler keeps the negative budget at 32 but uses:\\n+\\n+- 20 catalog-uniform negatives;\\n+- 8 unique in-batch negatives with the production propensity correction; and\\n+- 4 active explicit dislikes for that causal user-state snapshot.\\n+\\n+Rows without four active dislikes receive uniform fillers. The existing\\n+full-training-history positive and active-like filter is applied afterward, so\\n+ambiguous positives, the current target, and row duplicates are resampled.\\n+Architecture, chronological protocol, eligibility, target weights, and raw\\n+dot-product two-tower serving are unchanged. Offline hard-mining and all-inbatch\\n+ablations scored below production, so they were not selected.\\n+\\n+## Reproduction\\n+\\n+Public validation:\\n+\\n+```sh\\n+python /app/solution/train_current_model.py \\\\\\n+ --stage validation \\\\\\n+ --public-dir /task \\\\\\n+ --output /app/solution/improved_validation.parquet\\n+python /task/evaluate_public.py /app/solution/improved_validation.parquet\\n+```\\n+\\n+Final refit and ranking (the checked-in defaults are the selected settings):\\n+\\n+```sh\\n+python /app/solution/train_current_model.py \\\\\\n+ --stage submission \\\\\\n+ --public-dir /task \\\\\\n+ --output /app/solution/submission.parquet\\n+```\\n+\\n+The submitted artifact was refit from `train_* + val_*` and independently\\n+checked for exact user coverage, ranks 1–100, distinctness, integer schema, and\\n+test-cutoff eligibility.\\n*** Add File: /app/solution/test_negative_sampling.py\\n+import unittest\\n+\\n+import torch\\n+from torch.nn import functional as F\\n+\\n+from train_current_model import Config, corrected_negative_loss\\n+\\n+\\n+class NegativeLossTests(unittest.TestCase):\\n+ def test_three_negative_sources_share_the_fixed_budget(self) -> None:\\n+ logits = torch.zeros((3, 32))\\n+ weights = torch.ones_like(logits)\\n+ config = Config(\\n+ uniform_negatives=20,\\n+ inbatch_negatives=8,\\n+ explicit_dislike_negatives=4,\\n+ )\\n+ actual = corrected_negative_loss(logits, weights, config)\\n+ self.assertTrue(torch.allclose(actual, F.softplus(torch.zeros(3))))\\n+\\n+ def test_hard_pool_does_not_consume_explicit_dislike_columns(self) -> None:\\n+ logits = torch.tensor([[0.0, 1.0, 2.0, 100.0]])\\n+ weights = torch.ones_like(logits)\\n+ config = Config(\\n+ uniform_negatives=1,\\n+ inbatch_negatives=1,\\n+ hard_inbatch_pool=2,\\n+ explicit_dislike_negatives=1,\\n+ )\\n+ expected = (\\n+ F.softplus(logits[:, 0])\\n+ + F.softplus(logits[:, 2])\\n+ + F.softplus(logits[:, 3])\\n+ ) / 3.0\\n+ self.assertTrue(\\n+ torch.allclose(corrected_negative_loss(logits, weights, config), expected)\\n+ )\\n+\\n+\\n+if __name__ == \\\"__main__\\\":\\n+ unittest.main()\\n*** End Patch\";\ntext(await tools.apply_patch(patch));\n" } ### Tool output · 2026-09-23T22:25:04.083Z Script completed Wall time 0.0 seconds Output: {} ### Harness context { "type": "codex_item_completed", "item": { "type": "FileChange", "id": "exec-9eb7e624-ccc3-4700-9ee8-75c6ba4eef80", "changes": { "/app/solution/README.md": { "type": "add", "content": "# Improved discovery two-tower\n\n## Result\n\nPublic validation NDCG@10 improved from **0.021280** (production) to\n**0.022728** (+6.8%) on the unchanged chronological validation boundary.\n\n## Diagnosis and change\n\nThe production objective spends 24 of 32 negative slots on catalog-uniform\ntracks, which are usually easy tail negatives. Its remaining eight in-batch\nnegatives are useful but are sampled from positive targets and frequency\ncorrected. Neither source deliberately trains on the strongest user-specific\nnegative evidence already available: active explicit dislikes. In the retained\ntraining contexts, about half of rows have at least one active dislike, so\nuniform sampling almost never uses a plentiful signal.\n\nThe improved sampler keeps the negative budget at 32 but uses:\n\n- 20 catalog-uniform negatives;\n- 8 unique in-batch negatives with the production propensity correction; and\n- 4 active explicit dislikes for that causal user-state snapshot.\n\nRows without four active dislikes receive uniform fillers. The existing\nfull-training-history positive and active-like filter is applied afterward, so\nambiguous positives, the current target, and row duplicates are resampled.\nArchitecture, chronological protocol, eligibility, target weights, and raw\ndot-product two-tower serving are unchanged. Offline hard-mining and all-inbatch\nablations scored below production, so they were not selected.\n\n## Reproduction\n\nPublic validation:\n\n```sh\npython /app/solution/train_current_model.py \\\n --stage validation \\\n --public-dir /task \\\n --output /app/solution/improved_validation.parquet\npython /task/evaluate_public.py /app/solution/improved_validation.parquet\n```\n\nFinal refit and ranking (the checked-in defaults are the selected settings):\n\n```sh\npython /app/solution/train_current_model.py \\\n --stage submission \\\n --public-dir /task \\\n --output /app/solution/submission.parquet\n```\n\nThe submitted artifact was refit from `train_* + val_*` and independently\nchecked for exact user coverage, ranks 1–100, distinctness, integer schema, and\ntest-cutoff eligibility.\n" }, "/app/solution/train_current_model.py": { "type": "update", "unified_diff": "@@ -2205,3 +2205,3 @@\n {\n- \"baseline\": \"yambda-windowed-sequence-two-tower-base\",\n+ \"model\": \"yambda-windowed-sequence-two-tower-explicit-negatives\",\n \"stage\": args.stage,\n", "move_path": null }, "/app/solution/test_negative_sampling.py": { "type": "add", "content": "import unittest\n\nimport torch\nfrom torch.nn import functional as F\n\nfrom train_current_model import Config, corrected_negative_loss\n\n\nclass NegativeLossTests(unittest.TestCase):\n def test_three_negative_sources_share_the_fixed_budget(self) -> None:\n logits = torch.zeros((3, 32))\n weights = torch.ones_like(logits)\n config = Config(\n uniform_negatives=20,\n inbatch_negatives=8,\n explicit_dislike_negatives=4,\n )\n actual = corrected_negative_loss(logits, weights, config)\n self.assertTrue(torch.allclose(actual, F.softplus(torch.zeros(3))))\n\n def test_hard_pool_does_not_consume_explicit_dislike_columns(self) -> None:\n logits = torch.tensor([[0.0, 1.0, 2.0, 100.0]])\n weights = torch.ones_like(logits)\n config = Config(\n uniform_negatives=1,\n inbatch_negatives=1,\n hard_inbatch_pool=2,\n explicit_dislike_negatives=1,\n )\n expected = (\n F.softplus(logits[:, 0])\n + F.softplus(logits[:, 2])\n + F.softplus(logits[:, 3])\n ) / 3.0\n self.assertTrue(\n torch.allclose(corrected_negative_loss(logits, weights, config), expected)\n )\n\n\nif __name__ == \"__main__\":\n unittest.main()\n" } }, "status": "completed", "stdout": "Success. Updated the following files:\nA /app/solution/README.md\nA /app/solution/test_negative_sampling.py\nM /app/solution/train_current_model.py\n", "stderr": "" } } ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab45199da0887d297ed5f4354c27d7a", "usage": { "input_tokens": 81014, "cached_input_tokens": 80256, "cache_write_input_tokens": 0, "output_tokens": 1161, "reasoning_output_tokens": 126, "total_tokens": 82175 }, "turn_token_usage": { "input_tokens": 5501082, "cached_input_tokens": 5346688, "cache_write_input_tokens": 0, "output_tokens": 19793, "reasoning_output_tokens": 6724, "total_tokens": 5520875 }, "thread_token_usage": { "input_tokens": 5501082, "cached_input_tokens": 5346688, "cache_write_input_tokens": 0, "output_tokens": 19793, "reasoning_output_tokens": 6724, "total_tokens": 5520875 } } ## Step 75 · agent · 2026-09-23T22:25:10.835Z ### Thinking unavailable — no text recorded ### exec · 2026-09-23T22:25:15.195Z { "code": "const r = await tools.exec_command({cmd:\"cd /app/solution && /opt/task-venv/bin/python -m unittest -v test_negative_sampling.py && /opt/task-venv/bin/python -m py_compile train_current_model.py two_tower_model.py && stat -c '%F %n %s bytes' submission.parquet train_current_model.py two_tower_model.py README.md && find /app/solution -maxdepth 1 -type f -printf '%f %s\\\\n' | sort\",\"workdir\":\"/app/solution\",\"yield_time_ms\":30000,\"max_output_tokens\":6000}); text(r.output)\n" } ### Tool output · 2026-09-23T22:25:19.610Z Script completed Wall time 4.4 seconds Output: test_hard_pool_does_not_consume_explicit_dislike_columns (test_negative_sampling.NegativeLossTests.test_hard_pool_does_not_consume_explicit_dislike_columns) ... ok test_three_negative_sources_share_the_fixed_budget (test_negative_sampling.NegativeLossTests.test_three_negative_sources_share_the_fixed_budget) ... ok ---------------------------------------------------------------------- Ran 2 tests in 0.002s OK regular file submission.parquet 1216275 bytes regular file train_current_model.py 84396 bytes regular file two_tower_model.py 15985 bytes regular file README.md 2080 bytes README.md 2080 dislike_validation.parquet 1232576 hard_validation.parquet 1258556 inbatch_validation.parquet 1270451 production_validation.parquet 1244229 submission.parquet 1216275 submission_cache.npz 552686232 test_negative_sampling.py 1296 train_current_model.py 84396 two_tower_model.py 15985 uniform_validation.parquet 1206043 validation_cache.npz 535225808 ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab451c082ec87d28f4032208edfcbad", "usage": { "input_tokens": 82199, "cached_input_tokens": 80896, "cache_write_input_tokens": 0, "output_tokens": 292, "reasoning_output_tokens": 147, "total_tokens": 82491 }, "turn_token_usage": { "input_tokens": 5583281, "cached_input_tokens": 5427584, "cache_write_input_tokens": 0, "output_tokens": 20085, "reasoning_output_tokens": 6871, "total_tokens": 5603366 }, "thread_token_usage": { "input_tokens": 5583281, "cached_input_tokens": 5427584, "cache_write_input_tokens": 0, "output_tokens": 20085, "reasoning_output_tokens": 6871, "total_tokens": 5603366 } } ### Harness context { "type": "codex_item_completed", "item": { "type": "CommandExecution", "id": "exec-231d2db8-537b-4321-9f98-3736878e734f", "process_id": "75051", "command": [ "/bin/sh", "-lc", "cd /app/solution && /opt/task-venv/bin/python -m unittest -v test_negative_sampling.py && /opt/task-venv/bin/python -m py_compile train_current_model.py two_tower_model.py && stat -c '%F %n %s bytes' submission.parquet train_current_model.py two_tower_model.py README.md && find /app/solution -maxdepth 1 -type f -printf '%f %s\\n' | sort" ], "cwd": "file:///app/solution", "parsed_cmd": [ { "type": "unknown", "cmd": "cd /app/solution && /opt/task-venv/bin/python -m unittest -v test_negative_sampling.py && /opt/task-venv/bin/python -m py_compile train_current_model.py two_tower_model.py && stat -c '%F %n %s bytes' submission.parquet train_current_model.py two_tower_model.py README.md && find /app/solution -maxdepth 1 -type f -printf '%f %s\\n' | sort" } ], "source": "unified_exec_startup", "status": "completed", "stdout": "test_hard_pool_does_not_consume_explicit_dislike_columns (test_negative_sampling.NegativeLossTests.test_hard_pool_does_not_consume_explicit_dislike_columns) ... ok\ntest_three_negative_sources_share_the_fixed_budget (test_negative_sampling.NegativeLossTests.test_three_negative_sources_share_the_fixed_budget) ... ok\n\n----------------------------------------------------------------------\nRan 2 tests in 0.002s\n\nOK\nregular file submission.parquet 1216275 bytes\nregular file train_current_model.py 84396 bytes\nregular file two_tower_model.py 15985 bytes\nregular file README.md 2080 bytes\nREADME.md 2080\ndislike_validation.parquet 1232576\nhard_validation.parquet 1258556\ninbatch_validation.parquet 1270451\nproduction_validation.parquet 1244229\nsubmission.parquet 1216275\nsubmission_cache.npz 552686232\ntest_negative_sampling.py 1296\ntrain_current_model.py 84396\ntwo_tower_model.py 15985\nuniform_validation.parquet 1206043\nvalidation_cache.npz 535225808\n", "stderr": "", "aggregated_output": "test_hard_pool_does_not_consume_explicit_dislike_columns (test_negative_sampling.NegativeLossTests.test_hard_pool_does_not_consume_explicit_dislike_columns) ... ok\ntest_three_negative_sources_share_the_fixed_budget (test_negative_sampling.NegativeLossTests.test_three_negative_sources_share_the_fixed_budget) ... ok\n\n----------------------------------------------------------------------\nRan 2 tests in 0.002s\n\nOK\nregular file submission.parquet 1216275 bytes\nregular file train_current_model.py 84396 bytes\nregular file two_tower_model.py 15985 bytes\nregular file README.md 2080 bytes\nREADME.md 2080\ndislike_validation.parquet 1232576\nhard_validation.parquet 1258556\ninbatch_validation.parquet 1270451\nproduction_validation.parquet 1244229\nsubmission.parquet 1216275\nsubmission_cache.npz 552686232\ntest_negative_sampling.py 1296\ntrain_current_model.py 84396\ntwo_tower_model.py 15985\nuniform_validation.parquet 1206043\nvalidation_cache.npz 535225808\n", "exit_code": 0, "duration": { "secs": 4, "nanos": 241865523 }, "formatted_output": "test_hard_pool_does_not_consume_explicit_dislike_columns (test_negative_sampling.NegativeLossTests.test_hard_pool_does_not_consume_explicit_dislike_columns) ... ok\ntest_three_negative_sources_share_the_fixed_budget (test_negative_sampling.NegativeLossTests.test_three_negative_sources_share_the_fixed_budget) ... ok\n\n----------------------------------------------------------------------\nRan 2 tests in 0.002s\n\nOK\nregular file submission.parquet 1216275 bytes\nregular file train_current_model.py 84396 bytes\nregular file two_tower_model.py 15985 bytes\nregular file README.md 2080 bytes\nREADME.md 2080\ndislike_validation.parquet 1232576\nhard_validation.parquet 1258556\ninbatch_validation.parquet 1270451\nproduction_validation.parquet 1244229\nsubmission.parquet 1216275\nsubmission_cache.npz 552686232\ntest_negative_sampling.py 1296\ntrain_current_model.py 84396\ntwo_tower_model.py 15985\nuniform_validation.parquet 1206043\nvalidation_cache.npz 535225808\n" } } ## Step 76 · agent · 2026-09-23T22:25:33.719Z ### Thinking unavailable — no text recorded Implemented and shipped the improved two-tower ranking artifact. - Submission: [submission.parquet](/app/solution/submission.parquet) - Trainer: [train_current_model.py](/app/solution/train_current_model.py) - Model primitives: [two_tower_model.py](/app/solution/two_tower_model.py) - Experiment record: [README.md](/app/solution/README.md) Public NDCG@10 improved from **0.021280** to **0.022728** (+6.8%). The selected sampler retains 32 negatives: 20 uniform, 8 propensity-corrected in-batch, and 4 causal active-dislike negatives. Serving architecture and raw two-tower dot-product ranking remain unchanged. The final artifact was refit on `train_* + val_*` and verified for all requirements: - 8,456 exact target users - 845,600 rows - 100 distinct eligible items per user - Ranks 1–100 exactly once - Integer schema and regular file - SHA-256: `eb01a748be78d31eaa161a8dd08ba70afd611b42837497de05a902a060586cbd` ### Harness context { "type": "token_usage_record", "thread_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "session_id": "01a0d036-9eed-7833-a524-c1393b61a2d9", "root_turn_id": "01a0d036-9efd-7f13-9a31-e8c44e67e2f2", "response_id": "resp_0ec887da4662974b016ab451cfd0e487d28645784c9941e1e0", "usage": { "input_tokens": 82746, "cached_input_tokens": 82048, "cache_write_input_tokens": 0, "output_tokens": 475, "reasoning_output_tokens": 214, "total_tokens": 83221 }, "turn_token_usage": { "input_tokens": 5666027, "cached_input_tokens": 5509632, "cache_write_input_tokens": 0, "output_tokens": 20560, "reasoning_output_tokens": 7085, "total_tokens": 5686587 }, "thread_token_usage": { "input_tokens": 5666027, "cached_input_tokens": 5509632, "cache_write_input_tokens": 0, "output_tokens": 20560, "reasoning_output_tokens": 7085, "total_tokens": 5686587 } }