Gemma Fine-Tuning Hits GRPO Reward Collapse, Outputs Devolve to Gibberish
ivan_bezdomny · x · 2026-08-02
A developer reported an anomaly while fine-tuning a Gemma model: after initially training well, the GRPO reward suddenly dropped to zero. All outputs devolved into repetitive gibberish, a state from which the model could not recover.
Related event: Gemma Fine-tuning Fails as GRPO Reward Drops to Zero(2 posts)→
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