MGE-PO: Entropy-Aware Credit Assignment for Mathematical Reasoning
GRPO assigns the same group-relative advantage to equally rewarded responses within a question, leaving their generation uncertainty unused. We introduce MGE-PO, centered on four-quadrant (4Q) advantage shaping that combines verified correctness with rollout generation entropy. Correctness determines the sign of an add...
Ji-Hao Huang, Guang-Jia Chai, Zhi-Rui Chen et al.
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