Qiaosheng (Eric) Zhang 张乔生

Research Scientist Shanghai Artificial Intelligence Laboratory (上海人工智能实验室) Xuhui, Shanghai, China E-mail: ericzhang8951@gmail.com, zhangqiaosheng@pjlab.org.cn Ph.D. Advisor Shanghai Innovation Institute (上海创智学院)

About me

Grants and Awards

• Excellent Young Scientists Fund (Overseas) by NSFC

• Young Scholars Award, Information Theory Society of Chinese Institute of Electronics (2024)

• Outstanding Teaching Assistant Award, Department of Information Engineering, CUHK (2019)

Ph.D./Intern Opportunites

Research

Research interests

• Reinforcement Learning (RL): Online/Offline RL, RL from Human Feedback (RLHF), Multi-agent RL

• Large Language Model (LLM): LLM reasoning, LLM Agent, LLM Safety, RLHF

• Information Theory: Covert communication, Information-theoretic security, Identification, Mismatched decoding

• Community Detection (a.k.a. clustering): Stochastic Block Model (SBM), Contextual SBM, Hypergraph SBM

Projects

• MM-Eureka: Exploring the Frontiers of Multimodal Reasoning with Rule-based Reinforcement Learning [Report] [CPGD algorithm] [MM-PRM] [量子位 2025.6.23] [机器之心 2025.3.14]

Selected Publications

• Provably Efficient Information-Directed Sampling Algorithms for Multi-Agent Reinforcement Learning

  Q. Zhang, C. Bai, S. Hu, Z. Wang, X. Li

  Artificial Intelligence (AIJ), 2025.

• Sample-Efficient Reinforcement Learning from Human Feedback via Information-Directed Sampling

  H. Qi†, H. Yang, Q. Zhang, Z. Yang

  Submitted to IEEE Transactions on Information Theory, under revision, 2025

• Graph Attention is Not Always Beneficial: A Theoretical Analysis of Graph Attention Mechanisms via Contextual Stochastic Block Models

  Z. Ma†, Q. Zhang, B. Zhou†, Y. Zhang†, S. Hu, Z. Wang

  International Conference on Machine Learning (ICML), 2025.

• ROME is Forged in Adversity: Robust Distilled Datasets via Information Bottleneck

  Z. Zhou, W. Feng, Q. Zhang, S. Lyu, Q. Zhao, G. Cheng

  International Conference on Machine Learning (ICML), 2025.

• Online Preference Alignment for Language Models via Count-based Exploration

  C. Bai, Y. Zhang, S. Qiu, Q. Zhang, K. Xu, X. Li

  International Conference on Learning Representations (ICLR), 2025 (Spotlight, Top 5.1% ).

• Multi-LLM-Agents Debate - Performance, Efficiency, and Scaling Challenges

  H. Zhang†, Z. Cui, Q. Zhang, S. Hu

  International Conference on Learning Representations (ICLR), Blogpost Track, 2025.

• Graph Feedback Bandits on Similar Arms: With and Without Graph Structures

  H. Qi†, F. Guo, L. Zhu, Q. Zhang, X. Li

  Submitted to IEEE Transactions on Information Theory, 2025

• Community Detection for Contextual-LSBM: Theoretical Limitations of Misclassification Rate and Efficient Algorithms

  D. Jin†, Y. Zhang, Q. Zhang

  IEEE International Symposium on Information Theory (ISIT), 2025

• Optimal Information Security Against Limited-View Adversaries: The Benefits of Causality and Feedback

  M. Bakshi, S. Kadhe, Q. Zhang, S. Jaggi, A. Sprintson

  IEEE Transactions on Communications, 2025

• Matrix Completion with Hypergraphs: Sharp Thresholds and Efficient Algorithms

  Z. Ma†, Q. Zhang, Z. Wang

  Learning on Graphs Conference (LoG), 2024.

• Community Detection in the Multi-View Stochastic Block Model

  Y. Zhang†, Z. Ma†, Q. Zhang, Z. Wang, X. Li

  arXiv Preprint, 2024.

• Constrained Ensemble Exploration for Unsupervised Skill Discovery

  C. Bai, R. Yang, Q. Zhang, K. Xu, Y. Chen, T. Xiao, X. Li

  International Conference on Machine Learning (ICML), 2024.

• On the Role of General Function Approximation in Offline Reinforcement Learning

  C. Mao†, Q. Zhang, Z. Wang, X. Li

  International Conference on Learning Representations (ICLR), 2024. (Spotlight, Top 5% )

• Enhancing Covert Communication in OOK Schemes by Phase Deflection

  X. Ji, R. Zhu, Q. Zhang, C. Li, D. Cao

  IEEE Transactions on Information Forensic and Security, 2024.

• Ensemble Successor Representations for Task Generalization in Offline-to-Online Reinforcement Learning

  C. Wang, X. Yu, C. Bai, Q. Zhang, Z. Wang

  SCIENCE CHINA Information Sciences, 2024.

• Exact Recovery in the General Hypergraph Stochastic Block Model

  Q. Zhang, V. Y. F. Tan

  IEEE Transactions on Information Theory, 2023.

• Covert Communication with Mismatched Decoders

  Q. Zhang, V. Y. F. Tan

  IEEE Transactions on Information Theory, 2023. (accepted in part in IEEE ISIT 2022)

• Optimal Information Security Against Limited-view Adversaries: Beyond MDS Codes

  Q. Zhang, S. Kadhe, M. Bakshi, S. Jaggi, A. Sprintson

  IEEE Transactions on Communications, 2023. (accepted in part in IEEE ISIT 2015 and IEEE ITW 2015)

• Covert Communication Gains from Adversary’s Uncertainty of Phase Angles

  S. Qiao, D. Cao, Q. Zhang, Y. Xu, G. Liu

  IEEE Transactions on Information Forensic and Security, 2023.

• MC2G: An Efficient Algorithm for Matrix Completion with Social and Item Similarity Graphs

  Q. Zhang#, G. Suh#, C. Suh, V. Y. F. Tan (# indicates equal contribution)

  IEEE Transactions on Signal Processing, 2022.

• Covert Communication over Adversarially Jammed Channels

  Q. Zhang, M. Bakshi, S. Jaggi

  IEEE Transactions on Information Theory, 2021. (accepted in part in IEEE ITW 2018)

• Covert Identification over Binary-Input Discrete Memoryless Channels

  Q. Zhang, V. Y. F. Tan

  IEEE Transactions on Information Theory, 2021.

• Community Detection and Matrix Completion with Social and Item Similarity Graphs

  Q. Zhang, V. Y. F. Tan, C. Suh

  IEEE Transactions on Signal Processing, 2021. (accepted in part in IEEE ISIT 2020)

• Optimal Change-Point Detection with Training Sequences in the Large and Moderate Deviations Regimes

  H. He, Q. Zhang, V. Y. F. Tan

  IEEE Transactions on Information Theory, 2021. (accepted in part in IEEE ISITA 2020)

• Covert Communication with Polynomial Computational Complexity

  Q. Zhang, M. Bakshi, S. Jaggi

  IEEE Transactions on Information Theory, 2020. (accepted in part in IEEE ISIT 2016)

• Stealthy Communication Over Adversarially Jammed Multipath Networks

  J. Song†, Q. Zhang, S. Kadhe, M. Bakshi, S. Jaggi

  IEEE Transactions on Communications, 2020. (accepted in part in IEEE ISIT 2018)

• Undetectable Radios: Covert Communication under Spectral Mask Constraints

  Q. Zhang, M. Bloch, M. Bakshi, S. Jaggi

  IEEE International Symposium on Information Theory (ISIT), 2019