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Wei-Hong Luo

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#artificial intelligence Preprint Oct 2026

TrajEvolve: Trajectory Evolution for Reinforcement Learning with Hindsight Credit Assignment

TrajEvolve reformulates step-level continuous credit assignment as a binary classification task, whether each step is necessary for task completion, and simplification not only reduces the learning difficulty but also enables step labels to be obtained through counterfactual verification, achieving precise identificati...

Yi Wen, Hao Chen, Wan-Yu Wang et al. · 0 citations
#machine learning Preprint Oct 2026

Grounded Credit Assignment in Reinforcement Learning for Multi-Turn Search Agents

Outcome-reward reinforcement learning such as GRPO gives every token of a search-agent rollout the same advantage, although the rollout exercises two capabilities: finding evidence and using it. We show that accuracy improves without grounding: Search-R1 raises accuracy on all seven QA benchmarks, yet on Bamboogle the...

Qi-Rui Liu, Hao Chen, Yi Wen et al. · 1 citation

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