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Wei-Jie Shi

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#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
Preprint Aug 2026

MEDR: Query-Independent Frame Selection via Multi-Signal Event Modeling and Dynamic Rescoring

Frame selection is a fundamental component of multimodal large language models, enabling long videos to be processed under limited visual-token and computational budgets. Uniform sampling preserves temporal coverage but may miss informative content that appears only briefly. To alleviate this limitation, query-dependen...

Xinlei Pu, Weijie Shi, Wen Yang et al. · 0 citations
Jul 2026

DREvo: Distilling Recalibrated Historical Experience for Harness Self-Evolution

A new harness self-evolution method, named DREvo, is proposed, which integrates function-level evidence anchoring, state-dependent evidence recalibration, and role-conditioned search intent distillation to determine which historical evidence remains valid and where the harness should evolve next.

Hanghui Guo, Wei-Jie Shi, Zhangze Chen et al. · 4 citations
Jul 2026

Task Decomposition-Guided Reranking for Adaptive Agent Skill Retrieval

SkillReranker is proposed, an inference-time reranking framework for adaptive skill selection that effectively improves task performance, reduces environment interaction steps, and lowers token consumption compared with existing skill selection baselines.

Yanping Chen, Weijie Shi, Wen Yang et al. · 3 citations

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