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cs.LG2026
SHAPE: Stage-aware Hierarchical Advantage via Potential Estimation for LLM Reasoning
Zhengyang Ai, Zikang Shan, Xiaodong Ai +3
Process supervision has emerged as a promising approach for enhancing LLM reasoning, yet existing methods fail to distinguish meaningful progress from mere verbosity, leading to li…
cs.LG2026
Bringing Value Models Back: Generative Critics for Value Modeling in LLM Reinforcement Learning
Zikang Shan, Han Zhong, Liwei Wang +1
Credit assignment is a central challenge in reinforcement learning (RL). Classical actor-critic methods address this challenge through fine-grained advantage estimation based on a…