Gemma Fine-tuning Fails as GRPO Reward Drops to Zero

Developers encountered a critical training crash when fine-tuning the Gemma model, where the GRPO reward suddenly dropped to zero. This caused the model's output to completely degrade into repetitive gibberish without any chance of self-recovery.

2026-08-02 ~ 2026-08-02 · 2 related posts

• Training Crash: GRPO Reward Drops to Zero, Devolving Model Outputs into Gibberish — ivan_bezdomny · 2026-08-02
• Gemma Fine-Tuning Hits GRPO Reward Collapse, Outputs Devolve to Gibberish — ivan_bezdomny · 2026-08-02