About Me

Hi! My name is Leyi Pan (潘乐怡). I am currently a 2nd-year Ph.D. student at the School of Software in Tsinghua University, where I am advised by Prof. Lijie Wen. Before that, I received my B.Eng. degree from the School of Software in Tsinghua University in 2024.

I’m currently a research intern focusing on reasoning, reinforcement learning and general agent at Tongyi Lab, Alibaba Group, where I am working under the supervision of Dr. Yunpeng Zhai. Previously, I held research intern position at Zhipu AI under the supervision of Dr. Shiyu Huang. I also served as a Research Assistant at CUHK MISC Lab, working under the supervision of Prof. Irwin King (ACM Fellow, IEEE Fellow, AAAI Fellow).

Research Interests：

• Reasoning and Reinforcement Learning — Enhancing the reasoning capabilities of large foundation models and agents with reinforcement learning
• Trustworthy AI — Including safety alignment, evaluation and watermarking for AIGC

📖 Education

• 2024.09 - Present | Ph.D. in Computer Science
  School of Software, Tsinghua University

• 2020.09 - 2024.06 | B.E. in Computer Science
  School of Software, Tsinghua University

💻 Research Experience

• 2025.7 - Present | Tongyi Lab, Alibaba Group
  - Research Intern on reasoning, reinforcement learning and agentic RL
  - Mentor: Yunpeng Zhai

• 2024.10 - 2025.06 | AI Lab, Zhipu AI
  - Research Intern on reasoning for MLLMs
  - Mentor: Shiyu Huang

• 2024.06 - 2024.08 | The Chinese University of Hong Kong (CUHK)
  - Research Assistant on Trustworthy AI
  - Professor: Irwin King (ACM Fellow, IEEE Fellow, AAAI Fellow)

• 2023.06 - 2023.08 | KuaiShou Technology
  - Research Intern on Tool-integrated Agent
  - Mentors: Haojie Pan and Ruiji Fu

📝 Selected Preprints

• d-TreeRPO: Towards More Reliable Policy Optimization for Diffusion Language Models
  Leyi Pan, Shuchang Tao, Yunpeng Zhai, Zheyu Fu, Liancheng Fang, Minghua He, Lingzhe Zhang, Zhaoyang Liu, Bolin Ding, Aiwei Liu, Lijie Wen

• Omni-SafetyBench: A benchmark for safety evaluation of audio-visual large language models
  Leyi Pan, Zheyu Fu, Yunpeng Zhai, Shuchang Tao, Sheng Guan, Shiyu Huang, Lingzhe Zhang, Zhaoyang Liu, Bolin Ding, Felix Henry, Aiwei Liu, Lijie Wen
  

• GLM-4.5 V and GLM-4.1 V-Thinking: Towards Versatile Multimodal Reasoning with Scalable Reinforcement Learning
  Zhipu AI (76 authors including Leyi Pan)
  

• MarkDiffusion: An Open-Source Toolkit for Generative Watermarking of Latent Diffusion Models
  Leyi Pan, Sheng Guan, Zheyu Fu, Luyang Si, Huan Wang, Zian Wang, Hanqian Li, Xuming Hu, Irwin King, Philip S Yu, Aiwei Liu, Lijie Wen
  

• A Survey on Parallel Text Generation: From Parallel Decoding to Diffusion Language Models
  Lingzhe Zhang*, Liancheng Fang*, Chiming Duan*, Minghua He*, Leyi Pan*, Pei Xiao, Shiyu Huang, Yunpeng Zhai, Xuming Hu, Philip S Yu, Aiwei Liu

📝 Selected Publications（Full List）

• Can LLM Watermarks Robustly Prevent Unauthorized Knowledge Distillation?
  Leyi Pan, Aiwei Liu, Shiyu Huang, Yijian Lu, Xuming Hu, Lijie Wen, Irwin King, Philip S Yu
  ACL 2025

• WaterSeeker: Pioneering Efficient Detection of Watermarked Segments in Large Documents
  Leyi Pan, Aiwei Liu, Yijian Lu, Zitian Gao, Yichen Di, Lijie Wen, Irwin King, Philip S Yu
  NAACL 2025 Findings

• MarkLLM: An Open-Source Toolkit for LLM Watermarking
  Leyi Pan, Aiwei Liu, Zhiwei He, Zitian Gao, Xuandong Zhao, Yijian Lu, Binglin Zhou, Shuliang Liu, Xuming Hu, Lijie Wen, Irwin King, Philip S Yu
  EMNLP 2024 (System Demonstration Track)
  

• A Survey of Text Watermarking in the Era of Large Language Models
  Aiwei Liu*, Leyi Pan*, Yijian Lu, Jingjing Li, Xuming Hu, Lijie Wen, Irwin King, Philip S Yu
  ACM Computing Surveys
  

• A Semantic Invariant Robust Watermark for Large Language Models
  Aiwei Liu, Leyi Pan, Xuming Hu, Shiao Meng, Lijie Wen
  ICLR 2024
  

• An Unforgeable Publicly Verifiable Watermark for Large Language Models
  Aiwei Liu, Leyi Pan, Xuming Hu, Shuang Li, Lijie Wen, Irwin King, Philip S Yu
  ICLR 2024
  

🏆 Honors & Awards

• 2025: Tsinghua Excellent First-class Scholarship (清华大学综合优秀一等奖学金)
• 2024: Outstanding Graduate of Beijing (北京市优秀毕业生)
• 2024: Outstanding Graduate of Tsinghua (清华大学优良毕业生)
• 2024: Tsinghua Outstanding Graduation Project (清华大学优秀毕业设计)
• 2021-2023: Tsinghua Excellent Student Award (清华大学综合优秀奖学金)

📞 Contact

• Email:
  • panly24@mails.tsinghua.edu.cn
  • panleyi2003@gmail.com

🔍 Academic Services

• Reviewer: ACL ARR, NIPS, ICLR