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arXiv cs.CL AI Research 11h ago

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

★★★★★ significance 3/5

The paper introduces SHEAR, a method to improve reinforcement learning by using hidden-state distributions to identify where reasoning diverges. It uses Wasserstein distance to provide finer-grained credit assignment in models like GRPO, allowing for better token-level optimization using only outcome-level labels.

Why it matters Granular credit assignment via hidden-state analysis promises to bridge the gap between outcome-only rewards and efficient token-level optimization.
Read the original at arXiv cs.CL

Tags

#reinforcement learning #grpo #hidden states #credit assignment #wasserstein distance

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