Add Countdown number game RL recipe#594
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YujiaBao wants to merge 2 commits intothinking-machines-lab:mainfrom
Open
Add Countdown number game RL recipe#594YujiaBao wants to merge 2 commits intothinking-machines-lab:mainfrom
YujiaBao wants to merge 2 commits intothinking-machines-lab:mainfrom
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GRPO training on [Jiayi-Pan/Countdown-Tasks-3to4](https://huggingface.co/datasets/Jiayi-Pan/Countdown-Tasks-3to4) where models learn to reach a target number using 3-4 input numbers with basic arithmetic (+, -, *, /). **Key features:** - Verifiable reward with partial credit for "close but wrong" answers, converting all-bad GRPO groups into useful training signal - Configurable reward mode (`binary` vs `partial`) - KL penalty support via KLReferenceConfig - Fewshot prefix for cold-start format compliance **Hyperparameter sweep results** (Qwen3-4B-Instruct-2507, LoRA rank 32): | Config | Best Test Acc | |---------------------------|---------------| | binary, 512tok (baseline) | 68% | | partial, 1024tok | 76% | | partial, 2048tok, 40 steps| **85%** | Key findings: (1) partial credit adds ~4% by creating within-group reward variance, (2) token budget is the biggest lever (512→2048 = +17%), (3) model learns conciseness naturally through GRPO (avg tokens drops from 1100→500 over training). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
tinker_cookbook/recipes/countdown_rl/— GRPO training on Jiayi-Pan/Countdown-Tasks-3to4 where models combine 3-4 numbers with arithmetic to reach a targetbinaryvspartial), KL penalty support, fewshot prefixHyperparameter sweep
Test plan
pytest tinker_cookbook/recipes/countdown_rl/)🤖 Generated with Claude Code