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Why GRPO Needs Normalization: A Local-Curvature Perspective on Adaptive Gradients

Ge, Cheng et al.
arXiv (All) · Papers
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Reinforcement learning (RL) has become a key driver of language model reasoning. Among RL algorithms, Group Relative Policy Optimization (GRPO) is the de facto standard, avoiding the need for a critic by using per-prompt baselines and variance normalization. Yet why and when this normalization helps
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