Author

Haiguang Liu

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#machine learning Preprint Sep 2026

GraphHCA: Closed-Form Hindsight Credit Assignment for Long-Horizon LLM Agents

Group-based reinforcement learning (RL) has advanced large language models (LLMs) and is increasingly extending to agentic tasks, where sparse terminal rewards make step-level credit assignment essential. Existing methods assign credit from what follows an action in sampled rollouts, but do not explicitly capture its r...

Hao-Dong Zhu, Yang-Yang Ren, Chang-Bai Li et al. · 0 citations

Jul 2026

Kalman Meets Curriculum: Efficient Dynamic Prompt Selection for Adaptive RL Finetuning

A Kalman-Guided Prompt Selection method (KGPS), which reformulates prompt selection as a dynamic state estimation problem rather than static difficulty prediction, and consistently improves both final accuracy and rollout efficiency over strong baselines, establishing state-of-the-art performance among online prompt se...

Hao-Dong Zhu, Yang-Yang Ren, Yanjing Li et al. · arXiv.org · 2 citations · ⚡2