Yu-Jie Zhang @ RIKEN AIP

Postdoc Researcher
Imperfect Information Learning Team
RIKEN Center for Advanced Intelligence Project
Email: yu-jie.zhang [at] riken.jp

[CV, Google Scholar, Github]
zhangyj_photo1.jpg 

About Me

I am a postdoctoral researcher in the Imperfect Information Learning Team at RIKEN AIP. I earned my Ph.D. from the University of Tokyo under the supervision of Prof. Masashi Sugiyama. Previously, I completed my M.Sc. with the LAMDA Group at Nanjing University, under the supervision of Prof. Zhi-Hua Zhou.

Research Interests

My research interests include Machine Learning and Data Mining. Currently, I am interested in


Conference Papers

Journal Paper

  • Optimistic Online Mirror Descent for Bridging Stochastic and Adversarial Online Convex Optimization. [conference version, Journal version, arXiv, bibtex]
    Sijia Chen, Yu-Jie Zhang, Wei-Wei Tu, Peng Zhao, and Lijun Zhang.
    Journal of Machine Learning Research (JMLR), to appear, 2024.

  • Adaptivity and Non-stationarity: Problem-dependent Dynamic Regret for Online Convex Optimization. [PDF, arXiv, bibtex]
    Peng Zhao, Yu-Jie Zhang, Lijun Zhang, and Zhi-Hua Zhou.
    Journal of Machine Learning Research (JMLR), 25(98):1−52, 2024.

  • Exploratory Machine Learning with Unknown Unknowns. [PDF, code, bibtex]
    Peng Zhao, Jia-Wei Shan, Yu-Jie Zhang and Zhi-Hua Zhou.
    Artificial Intelligence (AIJ), to appear, 2024.

Academic Service

  • Reviewer for Conferences: AAAI (2021, 2024), AISTATS (2021-2024), ECAI (2020), ICLR (2022-2025), ICML (2022-2025), IJCAI (2020-2023), NeurIPS (2021-2025), UAI (2022-2024)
  • Reviewer for Journals: JMLR, IEEE TPAMI, FCS

Awards & Honors

  • Dean's Award for Outstanding Achievement (Doctoral Course), GSFS, UTokyo, 2025
  • AISTATS 2025 Best Reviewer, 2025
  • NeurIPS 2023 Top Reviewer, 2023
  • UAI 2023 Top Reviewer, 2023
  • NeurIPS 2022 Top Reviewer, 2022
  • Todai Fellowship, 2021
  • Excellent Graduate of Nanjing University, Nanjing, 2021
  • National Graduate Scholarship for Master Student, MOE of PRC, 2020
  • Excellent Graduate of Tongji University, Shanghai, 2018
  • Shanghai Undergraduate Scholarship, Shanghai, 2017, 2016