Welcome to Kaiyi Ji's Homepage

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About Me

I am an Assistant Professor in Computer Science and Engineering at the University at Buffalo. Previously, I was a Postdoctoral Researcher in Electrical Engineering and Computer Science at the University of Michigan, Ann Arbor, and a Visiting Student Research Collaborator in Electrical Engineering at Princeton University. I received my Ph.D. in Electrical and Computer Engineering from The Ohio State University and my B.E. from the University of Science and Technology of China. I received the UB CSE Junior Faculty Research Award (2023) and the NSF CAREER Award (2025).

Research Interests

I am particularly interested in the theoretical and algorithmic foundations for optimization, machine learning, and deep learning. My current focus is on:

  • Optimization & theory for modern ML: parameter-efficient optimization, multi-objective and bilevel optimization.

  • Foundation of AI and ML: multi-task learning, continual learning and meta-learning.

  • Efficient foundation-model adaptation: PEFT/LoRA for multi-task and federated settings, continual prompt tuning, training-free (multi-objective) decoding.

  • Applied side: methods validated in robotics, recommendation, and NLP.

Recent News!

  • [Service] 08/2025 I will serve as an Area Chair for ICLR 2026.

  • [Library] 07/2025 Our open-source multi-task learning-to-rank library DeepMTL2R led by Amazon is now online.

  • [Award] 04/2025 Glad to receive NSF CAREER Award [news].

  • [Software] 09/2024 Our FairGrad for multi-task/objective learning is now supported by open-source MTL Library LibMTL.

Recent Featured Works

Selected Publications