Preprints & Working Papers

10
01
2026OptimizationAI for Math

Lower Bounds for Nonconvex–PŁ Minimax Optimization

Siyu Pan, Jiajin Li

Preprint
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02
2026OptimizationAI for Math

Optimal Deterministic Oracle Complexity for Weakly Convex Optimization

(α–β order) Jiajin Li, Siyu Pan

Preprint
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03
2026Optimization

Nonconvex Composite Functional Constraints via First-Order Augmented Lagrangian Methods under Local Regularity

Linglingzhi Zhu, Jiajin Li

Preprint
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04
2026LLM TrainingAlgorithms

Spend Less, Reason Better: Budget-Aware Value Tree Search for LLM Agents

Yushu Li, Wenlong Deng, Jiajin Li, Xiaoxiao Li

Preprint
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05
2026LLM TrainingAlgorithms

On the Width Scaling of Neural Optimizers under Matrix Operator Norms I: Row/Column Normalization and Hyperparameter Transfer

Ruihan Xu, Jiajin Li, Yiping Lu

Preprint
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06
2025OptimizationAlgorithms

Doubly Smoothed Optimistic Gradients: A Universal Approach for Smooth Minimax Problems

Taoli Zheng, Anthony Man-Cho So, Jiajin Li

Preprint
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07
2026OptimizationAlgorithms

Last-Iterate Convergence of Single-Loop Stochastic Methods for Constrained Convex-Concave Minimax Problems

Taoli Zheng, Jiajin Li, Anthony Man-Cho So

PreprintUnder Review
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08
2026OptimizationAlgorithms

Smoothing Meets Perturbation: Unified and Tight Analysis for Nonconvex-Concave Minimax Optimization

(α–β order) Jiajin Li, Mahesh Nagarajan, Siyu Pan, Nanxi Zhang

PreprintUnder Review
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09
2026Optimization

Spurious Stationarity and Hardness Results for Bregman Proximal-Type Algorithms

(α–β order) He Chen, Jiajin Li, Anthony Man-Cho So

Preliminary version at OPT 2024Under Review
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10
2025Optimization

Unifying Distributionally Robust Optimization via Optimal Transport with Conditional Moment Constraints

(α–β order) Jose Blanchet, Daniel Kuhn, Jiajin Li, Bahar Taskesen

Under Revision
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Journal Articles

4
01
2025OptimizationAlgorithms

Nonsmooth Nonconvex-Nonconcave Minimax Optimization: Primal-Dual Balancing and Iteration Complexity Analysis

Jiajin Li, Linglingzhi Zhu, Anthony Man-Cho So

Mathematical Programming, Series A
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02
2025Optimization

Distributionally Robust Optimization and Robust Statistics

(α–β order) Jose Blanchet, Jiajin Li, Sirui Lin, Xuhui Zhang

Statistical Science
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03
2022Algorithms

A Splitting Scheme for Flip-Free Distortion Energies

Oded Stein, Jiajin Li, Justin Solomon

SIAM Journal on Imaging Sciences
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04
2020Optimization

Understanding Notions of Stationarity in Nonsmooth Optimization

Jiajin Li, Anthony Man-Cho So, Wing-Kin Ma

IEEE Signal Processing Magazine
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Conference Papers

14
01
2025Optimization

Set Smoothness Unlocks Clarke Hyper-Stationarity in Bilevel Optimization

He Chen, Jiajin Li, Anthony Man-Cho So

NeurIPSSpotlight
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02
2024

Automatic Outlier Rectification via Optimal Transport

(α–β order) Jose Blanchet, Jiajin Li, Markus Pelger, Greg Zanotti

NeurIPS
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03
2024

Stability Evaluation through Distributional Perturbation Analysis

(α–β order) Jose Blanchet, Peng Cui, Jiajin Li, Jiashuo Liu

ICML
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04
2024Algorithms

Synthetic Principal Component Design: Fast Covariate Balancing with Synthetic Controls

Yiping Lu, Jiajin Li, Lexing Ying, Jose Blanchet

UAIOral
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05
2023OptimizationAlgorithms

Universal Gradient Descent Ascent Method for Nonconvex-Nonconcave Minimax Optimization

Taoli Zheng, Linglingzhi Zhu, Anthony Man-Cho So, Jose Blanchet, Jiajin Li

NeurIPS
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06
2023Algorithms

Outlier-Robust Gromov-Wasserstein for Graph Data

Lemin Kong, Jiajin Li, Jianheng Tang, Anthony Man-Cho So

NeurIPSSpotlight
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07
2023OptimizationAlgorithms

A Convergent Single-Loop Algorithm for Relaxation of Gromov-Wasserstein in Graph Data

Jiajin Li, Jianheng Tang, Lemin Kong, Huikang Liu, Jia Li, Anthony Man-Cho So, Jose Blanchet

ICLR
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08
2022Optimization

Tikhonov Regularization is Optimal Transport Robust under Martingale Constraints

Jiajin Li, Sirui Lin, Jose Blanchet, Viet Anh Nguyen

NeurIPS
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09
2022Algorithms

Rethinking Graph Neural Networks for Anomaly Detection

Jianheng Tang, Jiajin Li, Ziqi Gao, Jia Li

ICML
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10
2021OptimizationAlgorithms

Modified Frank Wolfe in Probability Space

Carson Kent, Jiajin Li, Jose Blanchet, Peter Glynn

NeurIPS
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11
2021Algorithms

Deconvolutional Networks on Graph Data

Jia Li, Jiajin Li, Yang Liu, Jianwei Yu, Yueting Li, Hong Cheng

NeurIPS
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12
2020OptimizationAlgorithms

Fast Epigraphical Projection-based Incremental Algorithms for Wasserstein Distributionally Robust SVM

Jiajin Li, Caihua Chen, Anthony Man-Cho So

NeurIPS
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13
2020

The Gambler’s Problem and Beyond

Baoxiang Wang, Shuai Li, Jiajin Li, Siu on Chan

ICLR
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14
2019Algorithms

A First-Order Algorithmic Framework for Distributionally Robust Logistic Regression

Jiajin Li, Sen Huang, Anthony Man-Cho So

NeurIPS
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