Feiyuan Zhang

Feiyuan Zhang

Ph.D. Student, HKUST CSE Research Intern, Tencent Hy

Portrait of Feiyuan Zhang

I am a Ph.D. student in the Department of Computer Science and Engineering at the Hong Kong University of Science and Technology (HKUST), advised by Prof. Kai Chen in the iSING Lab. Previously, I received my M.Phil. degree from HKUST CSE, also advised by Prof. Kai Chen, and my B.S. degree in Applied Mathematics from Northwestern Polytechnical University.

I am currently a research intern on the RL Team of the Foundation Model Department at Tencent Hy (formerly Tencent Hunyuan), as part of the Tencent Qingyun Program. My research focuses on long-horizon agent reinforcement learning, as well as algorithms and infrastructure for agent RL training.

Tech Report

Selected Publications

NeurIPS 2026

Canopy: Tree-Aware Rollout Scheduling for Agent Reinforcement Learning

Feiyuan Zhang, Pengbo Li, Ziniu Li, Yuhao Jiang, Di Chai, Han Tian, Junhao Wang, Taiqiang Wu, Guanhua Huang, Chaoliang Zeng, Yihao Liu, Kai Chen

Conference on Neural Information Processing Systems (NeurIPS 2026), Main Conference

ATC 2026

PrefixFlow: Training-Time KV Caching for Schedule-Level Prefix Reuse in LLM RL Training

Pengbo Li, Feiyuan Zhang, Guangming Sheng, Guangxin He, Di Chai, Ziniu Li, Taiqiang Wu, Han Tian, Wenyu Mao, Binhang Yuan, Kai Chen

ACM SIGOPS Annual Technical Conference (ATC 2026)

Model Contributions

Open-source Tencent Hy models I have contributed to.

Experience

Education