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News/Hidden States Know Where Reasoning Diverges: Credit Assignment via Span-Level Wasserstein Distance
arxiv
PublishedApril 28, 2026 at 4:00 AM

Hidden States Know Where Reasoning Diverges: Credit Assignment via Span-Level Wasserstein Distance

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arXiv:2604.23318v1 Announce Type: new Abstract: Group Relative Policy Optimization (GRPO) performs coarse-grained credit assignment in reinforcement learning with verifiable rewards (RLVR) by assigning the same advantage to all tokens in a rollout. Process reward models can provide finer-grained sup

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