I am a third-year PhD student in the Department of Operations Research at Columbia University. I am very fortunate to work with Prof. Garud Iyengar, Prof. Jay Sethuraman, and Prof. Hongseok Namkoong. From 2019 to 2021, I spent two years at Georgia Tech ISyE as a graduate student studying statistics and mathematics. I also completed an undergraduate degree in economics from East China Normal University, while working full-time (joined in 2016 as a founding member) at a FinTech startup (NASDAQ: QFIN and HKEX:3660) in China, focusing on ML problems.

Broadly, my research develops models and algorithms for reliable and responsbile decision making tailored for modern operations. I use techniques from optimization, stochastic modeling, learning theory, and game theory.

Recent Talks

• 11/17/2023, Guest lecture (joint with Daksh Mittal) for the course Advanced Machine Learning for Health and Medicine, topic: uncertainty quantification for interpretability in deep learning
• 11/10/2023, Conference on Digital Experimentation @ MIT: two papers on user interests exploration (12-minute talk in Session J: “Personalization and Experimentation”) and causal inference under limited overlap.

Papers

Here are my Semantic and Google scholar profiles.

The Distributional Effects of “Fulfilled By Amazon” (FBA)

Garud Iyengar, Yuanzhe Ma, Thomas J. Rivera, Fahad Saleh, Jay Sethuraman
[SSRN]

• Scheduled to be presented at INFORMS Annual Meeting, Phoenix, AZ, 2023.
• Presented at POMS Annual Meeting, Orlando, FL, 2023.
• Presented at Marketplace Innovation Workshop, Virtual, 2023.

Minimax Optimal Estimation of Stability Under Distribution Shift

Hongseok Namkoong, Yuanzhe Ma, Peter W. Glynn
[arxiv]

• Major revision, Operations Research
• Presented at NYC Operations Day (poster), New York, NY, 2023.
• Presented at Columbia Statistical Machine Learning Symposium, New York, NY, 2023.

Hybrid Random Features

Krzysztof Choromanski^*, Haoxian Chen^*, Han Lin^*, Yuanzhe Ma^*, Arijit Sehanobish^*, Deepali Jain, Michael S Ryoo, Jake Varley, Andy Zeng, Valerii Likhosherstov, Dmitry Kalashnikov, Vikas Sindhwani, Adrian Weller
ICLR 2022
[paper link][arxiv][code][talk][slides]

Courses

Courses I’ve taught as a teaching assistant:

• IEOR 4111 Operations Consulting (MS in Management Science and Engineering core course, taught by Prof. Soulaymane Kachani)
• IEOR 4703 Monte Carlo Simulation (MS in Financial Engineering core course, taught by Prof. Ali Hirsa)