About Me

I am Yulai, an incoming 3rd-year Ph.D. candidate at Princeton working on machine learning.

My research primarily explores modern reinforcement learning and diffusion models both theoretically and experimentally. I am particularly interested in solving challenging scientific problems through data-driven approaches.

Experiences

• Research Intern @ BRAID (Biology Research | AI Development), Research & Early Development, Genentech
• Ph.D. Student @ Electrical and Computer Engineering, Princeton University
• Visiting Student @ Institute for Machine Learning, ETH Zürich
• Research Assistant @ Computer Science & Engineering, University of Washington
• Bachelor @ Electronic Engineering, Tsinghua University

Publications

* denotes equal contribution or alphabetical ordering.

• Understanding Reinforcement Learning-Based Fine-Tuning of Diffusion Models: A Tutorial and Review
  Masatoshi Uehara*, Yulai Zhao*, Tommaso Biancalani, Sergey Levine
  [arXiv] [GitHub]

• Adding Conditional Control to Diffusion Models with Reinforcement Learning
  Yulai Zhao*, Masatoshi Uehara*, Gabriele Scalia, Tommaso Biancalani, Sergey Levine, Ehsan Hajiramezanali
  [arXiv]

• Bridging Model-Based Optimization and Generative Modeling via Conservative Fine-Tuning of Diffusion Models
  Masatoshi Uehara*, Yulai Zhao*, Ehsan Hajiramezanali, Gabriele Scalia, Gökcen Eraslan, Avantika Lal, Sergey Levine, Tommaso Biancalani
  [arXiv]

• Feedback Efficient Online Fine-Tuning of Diffusion Models
  Masatoshi Uehara*, Yulai Zhao*, Kevin Black, Ehsan Hajiramezanali, Gabriele Scalia, Nathaniel Lee Diamant, Alex M Tseng, Sergey Levine, Tommaso Biancalani
  International Conference on Machine Learning (ICML) 2024
  [paper] [arXiv] [GitHub]

• Fine-Tuning of Continuous-Time Diffusion Models as Entropy-Regularized Control
  Masatoshi Uehara*, Yulai Zhao*, Kevin Black, Ehsan Hajiramezanali, Gabriele Scalia, Nathaniel Lee Diamant, Alex M Tseng, Tommaso Biancalani, Sergey Levine
  [arXiv]

• Provably Efficient CVaR RL in Low-rank MDPs
  Yulai Zhao*, Wenhao Zhan*, Xiaoyan Hu*, Ho-fung Leung, Farzan Farnia, Wen Sun, Jason D. Lee
  International Conference on Learning Representations (ICLR) 2024
  [paper] [arXiv]

• Local Optimization Achieves Global Optimality in Multi-Agent Reinforcement Learning
  Yulai Zhao, Zhuoran Yang, Zhaoran Wang, Jason D. Lee
  International Conference on Machine Learning (ICML) 2023
  [paper] [arXiv]

• Blessing of Class Diversity in Pre-training
  Yulai Zhao, Jianshu Chen, Simon S. Du
  International Conference on Artificial Intelligence and Statistics (AISTATS) 2023
  [Oral Presentation] [Notable Paper]
  [paper] [arXiv]

• Optimizing the Performative Risk under Weak Convexity Assumptions
  Yulai Zhao
  NeurIPS 2022 Workshop on Optimization for Machine Learning
  [paper] [arXiv]

• Provably Efficient Policy Optimization for Two-Player Zero-Sum Markov Games
  Yulai Zhao, Yuandong Tian, Jason D. Lee, Simon S. Du
  International Conference on Artificial Intelligence and Statistics (AISTATS) 2022
  [paper] [arXiv]