Working Papers
Working Papers
Journal Publications
Memory, Nonlinearity, and Drift–Contraction in Stochastic Approximation with a Constant Stepsize
Yixuan Zhang, Lucy Huo, Qiaomin Xie
Submitted to Mathematics of Operations Research.
Prelimit Coupling and Steady-State Convergence of Constant-stepsize Nonsmooth Contractive SA
Yixuan Zhang, Lucy Huo, Yudong Chen and Qiaomin Xie
Minor revision at Operations Research
Conference Publications
A Piecewise Lyapunov Analysis of Sub-quadratic SGD: Applications to Robust and Quantile Regression
Yixuan Zhang, Lucy Huo, Yudong Chen and Qiaomin Xie
ACM SIGMETRICS 2025
The Collusion of Memory and Nonlinearity in Stochastic Approximation With Constant Stepsize
Lucy Huo, Yixuan Zhang, Yudong Chen, Qiaomin Xie
NeurIPS 2024 (Spotlight)
Prelimit Coupling and Steady-State Convergence of Constant-stepsize Nonsmooth Contractive SA
Yixuan Zhang, Lucy Huo, Yudong Chen and Qiaomin Xie
ACM SIGMETRICS 2024 [video]
Constant Stepsize Q-learning: Distributional Convergence, Bias and Extrapolation
Yixuan Zhang and Qiaomin Xie
Reinforcement Learning Conference 2024