Complementing reinforcement learning with SFT through logit averaging in the post training of LLMs

Abstract:We introduce a novel method that averages the logits of a frozen reference policy (e.g., SFT) and a trainable policy, and incorporate the method into Group Relative Policy Optimization (GRPO). In contrast to Reinforcement Learning with Verifiable Rewards (RLVR) methods, our proposal does not involve a Kullback Leibler (KL) regularization or critic; the trainable policy and the reference anchor are coupled through the logit averaging structure to leverage the reasoning expertise of the trainable policy while maintaining the formatting advantage of SFT. Our method is evaluated on MATH, cn-k12, and MMLU, and the results show a higher accuracy or at least comparable accuracy relative to the canonical KL-regularized GRPO.

Machine Learning (cs.LG); Artificial Intelligence (cs.AI)

arXiv:2605.20555 [cs.LG]

(or arXiv:2605.20555v2 [cs.LG] for this version)

https://doi.org/10.48550/arXiv.2605.20555 Focus to learn more arXiv-issued DOI via DataCite

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