Search Results for author: Zi Xu

Found 7 papers, 0 papers with code

Two trust region type algorithms for solving nonconvex-strongly concave minimax problems

no code implementations15 Feb 2024 Tongliang Yao, Zi Xu

In this paper, we propose a Minimax Trust Region (MINIMAX-TR) algorithm and a Minimax Trust Region Algorithm with Contractions and Expansions(MINIMAX-TRACE) algorithm for solving nonconvex-strongly concave minimax problems.

Zeroth-Order primal-dual Alternating Projection Gradient Algorithms for Nonconvex Minimax Problems with Coupled linear Constraints

no code implementations26 Jan 2024 Huiling Zhang, Zi Xu, Yuhong Dai

nonconvex-concave) minimax problems with coupled linear constraints under deterministic settings and $\tilde{\mathcal{O}}(\varepsilon ^{-3})$ (resp.

An accelerated first-order regularized momentum descent ascent algorithm for stochastic nonconvex-concave minimax problems

no code implementations24 Oct 2023 Huiling Zhang, Zi Xu

Stochastic nonconvex minimax problems have attracted wide attention in machine learning, signal processing and many other fields in recent years.

Primal Dual Alternating Proximal Gradient Algorithms for Nonsmooth Nonconvex Minimax Problems with Coupled Linear Constraints

no code implementations9 Dec 2022 Huiling Zhang, Junlin Wang, Zi Xu, Yu-Hong Dai

The iteration complexity of the two algorithms are proved to be $\mathcal{O}\left( \varepsilon ^{-2} \right)$ (resp.

Zeroth-Order Alternating Gradient Descent Ascent Algorithms for a Class of Nonconvex-Nonconcave Minimax Problems

no code implementations24 Nov 2022 Zi Xu, Zi-Qi Wang, Jun-Lin Wang, Yu-Hong Dai

In this paper, we consider a class of nonconvex-nonconcave minimax problems, i. e., NC-PL minimax problems, whose objective functions satisfy the Polyak-\L ojasiewicz (PL) condition with respect to the inner variable.

Derivative-free Alternating Projection Algorithms for General Nonconvex-Concave Minimax Problems

no code implementations1 Aug 2021 Zi Xu, Ziqi Wang, Jingjing Shen, Yuhong Dai

In this paper, we study zeroth-order algorithms for nonconvex-concave minimax problems, which have attracted widely attention in machine learning, signal processing and many other fields in recent years.

Data Poisoning

A Unified Single-loop Alternating Gradient Projection Algorithm for Nonconvex-Concave and Convex-Nonconcave Minimax Problems

no code implementations3 Jun 2020 Zi Xu, Huiling Zhang, Yang Xu, Guanghui Lan

Moreover, its gradient complexity to obtain an $\varepsilon$-stationary point of the objective function is bounded by $\mathcal{O}\left( \varepsilon ^{-2} \right)$ (resp., $\mathcal{O}\left( \varepsilon ^{-4} \right)$) under the strongly convex-nonconcave (resp., convex-nonconcave) setting.

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