👋 About Me

Hello, I am Shuai Zhen (甄帅), a master's student in Computer Science and Technology at Beijing University of Posts and Telecommunications (BUPT). I received my Bachelor's degree from Tiangong University in 2024.

My research interests lie in Reinforcement Learning (RL) and Large Language Models (LLMs), with a particular focus on:

1. Improving the sample and training efficiency of RL for LLMs.
2. Exploring novel applications of RL to enhance LLM capabilities.
3. Developing more efficient and effective attention mechanisms.

📝 Selected Publications

ACL 2026 · Main ConferenceHierarchical Reinforcement Learning with Augmented Step-Level Transitions for LLM Agents

Shuai Zhen, Yanhua Yu, Ruopei Guo, Nan Cheng, Yang Deng

STEP-HRL enables efficient long-horizon decision-making through subtask planning and compact local progress tracking, avoiding the need to condition on an ever-growing interaction history while reducing token usage.

Paper Code8 Dataset 6 citations

arXiv 2026HRM-Text: Efficient Pretraining Beyond Scaling

Guan Wang, Changling Liu, Chenyu Wang, Cai Zhou, Yuhao Sun, Yifei Wu, Shuai Zhen, Luca Scimeca, Yasin Abbasi Yadkori

A 1B-parameter hierarchical recurrent language model trained on 40B unique tokens, outperforming Llama 3.2 3B, Gemma 3 4B, Qwen 3.5 2B, and OLMo 3 7B on ARC-C, DROP, GSM8K, and MATH.

Paper Code2.1k 机器之心 量子位 6 citations

arXiv 2026Reflex: Reinforcement Learning with Reflection Symmetry Exploitation in State-Based Continuous Control

Shuai Zhen, Yifan Zhang, Yuling Wang, Yanhua Yu

Integrating reflection symmetry into PPO and SAC to improve sample efficiency in continuous control.

PaperCode

📖 Education

• 2024.09 – Present | Beijing University of Posts and TelecommunicationsMaster, Computer Science and Technology, advised by Prof. Yanhua Yu.
• 2020.09 – 2024.07 | Tiangong UniversityBachelor, Information Management and Information Systems.

🌏 Experience

• 2026.07 – 2026.09, Summer Internship, ASI Lab, National University of Singapore (NUS), advised by Prof. Dianbo Liu.
• 2023.09 – 2024.02, Exchange, Universitat Politècnica de Catalunya (UPC).

💻 Internships

• 2025.02 – 2026.07 | Sapient Intelligence
• 2024.02 – 2024.08 | MeiTuan