Bio

Hi! I'm a third-year PhD student in Computer Science and Engineering at Santa Clara University, working under the guidance of Professor Yi Fang. Prior to joining SCU, I completed my undergraduate degree in Physics at the University of California, Davis. I'm currently on track to graduate in 2028.

Research

My research focuses on information retrieval, particularly in how to leverage large language models (LLMs) for information retrieval tasks. I'm also interested in self-improving AI methods.

Papers

RankEvolve: Automating the Discovery of Retrieval Algorithms via LLM-Driven Evolution
, Fangchen Li, Dae Hoon Park, Yi Fang
SIGIR 2026 | paper | code

Submodular Evaluation Subset Selection in Automatic Prompt Optimization
, Zhiyuan Peng, Hongwei Shang, Dae Hoon Park, Yi Fang
arXiv (Jan 2026) | paper | code

W-RAG: Weakly Supervised Dense Retrieval in RAG for Open-domain Question Answering
, Zhiyuan Peng, Qifan Wang, Yi Fang
SIGIR ICTIR 2025 | paper | code

ELOQ: Resources for Enhancing LLM Detection of Out-of-Scope Questions
Zhiyuan Peng*, , Alexandre Evfimievski, Yi Fang
SIGIR 2025 | paper | code | dataset

Does Reasoning Introduce Bias? A Study of Social Bias Evaluation and Mitigation in LLM Reasoning
Xuyang Wu*, , Ting-Ruen Wei*, Zhiqiang Tao, Hsin-Tai Wu, Yi Fang
EMNLP Findings 2025 | paper | code

Energy Systematics of the Coulomb Effect in Au+ Au Collisions at STAR
, STAR Collaboration
APS Division of Nuclear Physics Meeting, 2020 | poster | abstract

Last Update: April 2026