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README.md

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+---
+configs:
+- config_name: default
+  data_files:
+  - split: train_no_aux
+    path: data/train_no_aux-*
+  - split: train_aux_cascade
+    path: data/train_aux_cascade-*
+  - split: train_aux_multitask
+    path: data/train_aux_multitask-*
+  - split: test
+    path: data/test-*
+  - split: validation
+    path: data/validation-*
+pretty_name: FinalMix3
+license: other
+language:
+- en
+task_categories:
+- text-generation
+tags:
+- code
+- code-generation
+- code-reasoning
+- reinforcement-learning
+- verl
+size_categories:
+- 10K<n<100K
+---
+
+# FinalMix3
+
+A multi-task **code reinforcement-learning** mixture in the
+[`verl`](https://github.com/volcengine/verl) RL prompt format: one code-generation
+split plus a suite of auxiliary code-understanding tasks, so the same corpus drives
+three training regimes.
+
+It is [`OctoReasoner/FinalMix2`](https://huggingface.co/datasets/OctoReasoner/FinalMix2)
+with three changes: every row now carries **one uniform prompt format**, the auxiliary
+mix is **rebalanced by ability**, and four defects where a prompt contradicted the
+grader that scores it are **repaired**. The rows themselves are otherwise the same
+problems, with the same rule-verifiable rewards.
+
+## Splits
+
+| Split | Rows | Contents | Use |
+|-------|-----:|----------|-----|
+| `train_no_aux` | 9,693 | code generation only (9,693 rows) | RL on code generation alone |
+| `train_aux_cascade` | 25,318 | all 15,625 auxiliary rows first, then the 9,693 code rows | cascade / curriculum RL (aux → code) |
+| `train_aux_multitask` | 25,318 | the same rows, interleaved | mixed multi-task RL |
+| `validation` | 481 | held-out code-generation problems | held-out code generation, for in-training validation |
+| `test` | 175 | LiveCodeBench-v6 problems | LiveCodeBench-v6, repaired (see below) |
+
+## Prompt format
+
+Every row — code generation and auxiliary alike — is exactly two turns: a system turn
+that is byte-identical across the whole dataset, and a user turn that opens with an
+`[INSTRUCTION]` block naming the task and its answer format, and closes with a one-line
+reminder of that format.
+
+```
+system: You are an expert coding professional. You are given a self-contained
+        code-related task instruction, ... Failure to follow this format will result
+        in immediate task failure. Do not output any other text after your final answer.
+
+user:   [INSTRUCTION]
+        Predict the big-O time complexity of the code below.
+        Reply in the format \boxed{X}, where X is the complexity in standard big-O
+        notation, e.g. \boxed{O(1)}, \boxed{O(n)}, ... Write exponents as **.
+        [/INSTRUCTION]
+
+        [CODE] ... [/CODE]
+
+        Remember to reply with your answer within \boxed{...}. Any other format will
+        be immediately rejected.
+```
+
+This replaces FinalMix2's 25 per-family system prompts and its two rival code-fencing
+conventions. Answers are extracted last-wins (the last fenced python block, the last
+`\boxed{...}`, or a JSON object with the named key), so reasoning before the answer is
+free. The reminder's wording follows how each row is *graded*, not how it looks.
+
+## Auxiliary tasks
+
+15,625 rows across 24 abilities. FinalMix2 budgeted its auxiliary mix per
+*source family* (14 of them) while `ability` (24 values) was never a stratification key,
+so rare abilities inside large families were crushed — `code_io_output_from_input_mcq`
+held **4 rows**. FinalMix3 rebalances with a floor of 400 and a cap of 1,200 per ability:
+short abilities are topped back up from
+[`OctoReasoner/CodeAuxTasks`](https://huggingface.co/datasets/OctoReasoner/CodeAuxTasks)
+(candidates must clear the same length, language and near-duplicate gates the mix used),
+and over-cap abilities are trimmed keeping the most distinctive rows. The spread across
+abilities falls from 549x to 5.6x.
+
+| ability | rows |
+|---------|-----:|
+| `code_io_input_from_output_mcq` | 1,200 |
+| `code_from_space_complexity_mcq` | 1,200 |
+| `coderpile_retrieval` | 1,200 |
+| `pick_codes_similar_to_reference` | 1,200 |
+| `predict_cwe_from_code_mcq` | 1,020 |
+| `code_change_localization` | 836 |
+| `code_from_time_complexity_mcq` | 829 |
+| `code_cputime_ranking` | 817 |
+| `variable_output_tracing` | 735 |
+| `code_io_output_from_input_direct` | 707 |
+| `code_memory_ranking` | 593 |
+| `code_compile_status_prediction` | 583 |
+| `localize_callable_from_cwe_mcq` | 552 |
+| `localize_callable_from_cwe_direct` | 498 |
+| `predict_cwe_from_code_catalog` | 400 |
+| `code_io_input_output_pairs_mcq` | 400 |
+| `time_complexity_from_code_mcq` | 400 |
+| `code_io_input_from_output_direct` | 400 |
+| `time_complexity_from_code_direct` | 400 |
+| `space_complexity_from_code_mcq` | 400 |
+| `space_complexity_from_code_direct` | 400 |
+| `code_verifiable_instruction_following_generation` | 387 |
+| `code_io_output_from_input_mcq` | 252 |
+| `code_verifiable_instruction_following_edit` | 216 |
+
+## Code split
+
+| Source | Rows | Share |
+|--------|-----:|------:|
+| `code_primeintellect` | 5,241 | 54.1% |
+| `code_contests_o` | 2,538 | 26.2% |
+| `code_taco` | 1,721 | 17.8% |
+| `code_lcbv5` | 193 | 2.0% |
+
+## Repairs carried over FinalMix2
+
+Each of these is a case where the shipped prompt or ground truth contradicted the grader,
+so a correct answer could not score:
+
+1. **`pick_codes_similar_to_reference`** asked for a *clustering* (`\boxed{(1, 2, 4), (3)}`)
+   while the gold is the flat list of positions equivalent to the reference and the scorer
+   compares the set of integers in the answer — obeying the prompt scored 0.
+2. **`predict_cwe_from_code_mcq`** capped answers at option `E` while every row offers six
+   options; `F` was the single most common gold answer.
+3. **Multi-letter CWE answers** are compared by string equality, so the required
+   alphabetical ordering is stated again (it had been dropped in an earlier rewrite).
+4. **LiveCodeBench-v6 (`test`)**: 63 of 175 rows are functional problems whose ground truth
+   carried no `fn_name`, so the checker graded them as stdin/stdout and the `class Solution`
+   answer the prompt asks for scored 0 on every case. `fn_name` is now set from the starter
+   signature and the expected outputs are canonicalised to what the fn-call harness prints.
+   Scored end to end through the real reward path: 0/63 before, 63/63 after.
+
+One row (`vartrace_2327`) was dropped: it asks for the final value of a variable it never
+names, and unlike the 16 similar rows it cannot be reconstructed.
+
+## Schema
+
+Unchanged from FinalMix2:
+
+| Field | Type | Notes |
+|-------|------|-------|
+| `data_source` | string | routes the reward function |
+| `prompt` | list of `{role, content}` | system + user, as above |
+| `ability` | string | task category |
+| `reward_model` | struct `{style, extraction_method, ground_truth, key}` | scoring spec |
+| `extra_info` | struct `{id, lower_pass_rate, upper_pass_rate}` | per-example metadata |
+
+Code-generation rows are scored by executing the model's program against hidden tests in a
+sandbox; auxiliary rows by rule-based extraction against `ground_truth`.
+
+## Reproduction
+
+```bash
+python tasks/stratify_aux.py  --src FinalMix2/data       --out FinalMix2-strat/data \
+                              --floor 400 --cap 1200
+python tasks/unify_prompts.py --src FinalMix2-strat/data --out FinalMix3/data
+python tasks/verify_unified_prompts.py --src FinalMix2-strat/data --out FinalMix3/data
+```
+
+The verifier checks every row: two turns with the byte-identical system prompt, one
+`[INSTRUCTION]` block carrying the ability's defined text, a reminder matching how the row
+is graded, the task content preserved verbatim from FinalMix2, and `data_source` /
+`ability` / `reward_model` / `extra_info` and row order otherwise untouched.

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