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Yu Li

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#artificial intelligence Preprint Oct 2026

Credit Where It Matters: Dependency-Aware Policy Optimization for Terminal Agents

Terminal-using agents benefit from reinforcement learning (RL) in coding, debugging, and other multi-step terminal tasks. In these tasks, later commands often depend on information or intermediate results produced by earlier commands. However, existing trajectory-level and step-level credit assignment methods do not ex...

Yu Li, Guang-Feng Cai, Long-Fei Li et al. · 0 citations
#artificial intelligence Preprint Oct 2026

Choosing Before Acting: Comparative Value Estimation for Long-Horizon Tool-Use Agents

Large language models (LLMs) rely on long-horizon tool invocation sequences for complex tasks, where each invocation can alter the task state and condition subsequent decisions. In long-horizon tool use, final-outcome rewards provide weak credit assignment over long interaction traces. Step-level rewards can offer more...

Yu Li, Zheng Zhang, Xin Liu et al. · 0 citations
Preprint Sep 2026

SRPO: Setwise Relative Policy Optimization for Multi-Agent Systems

Multi-agent systems enable complex reasoning and tool use by coordinating agents that divide roles and refine candidate solutions. Existing methods typically update individual agent responses or treat a complete trajectory as one training example. However, these methods may produce misleading policy updates because the...

Sheng-Tian Yang, Zi-Yun Xiong, Yu Li et al. · 0 citations
#artificial intelligence Preprint Sep 2026

SRPO: Setwise Relative Policy Optimization for Multi-Agent LLMs

Multi-agent large language models solve complex tasks by coordinating several policies in a shared environment. However, existing reinforcement learning methods usually optimize each response or trajectory separately, even when several outputs jointly cause one state transition. Consequently, the update unit differs fr...

Sheng-Tian Yang, Zi-Yun Xiong, Yu Li et al. · 4 citations

Reasoning and Tool-use Compete in Agentic RL:From Quantifying Interference to Disentangled Tuning

This paper proposes Disentangled Action--Reasoning Tuning (DART), a simple and efficient framework that explicitly decouples parameter updates for reasoning and tool use via separate low-rank adaptation modules, further supporting the finding of capability interference under shared optimization.

Yu Li, Ming-Yang Yi, Xiu‐Qing Li et al. · 15 citations · ⚡1
Jul 2026

Progress-conditioned Group Policy Optimization for Long-Horizon Agentic Tasks

Progress-conditioned Group Policy Optimization is proposed, which uses first-visit observation coverage only when all samples in a group receive zero outcome reward, and consistently improves over group-based baselines, with particularly large gains on hard tasks.

Kaibing Yang, Guangfeng Cai, Sheng-Tian Yang et al. · 1 citation

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