Fine-tuning a 350M Model for Better Structured Outputs in 100 GRPO Steps
This guide provides a reproducible recipe for fine-tuning a 350M model with Group Relative Policy Optimization (GRPO) to improve structured-output compliance. Using TRL library and the IFStruct benchmark, the full run fits on a free-tier Colab GPU and demonstrates a 7.1 percentage point improvement. The post includes prerequisites, evaluation setup, and training pipeline details.
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