On convergence analysis of dual proximal-gradient methods with approximate gradient fora class of nonsmooth convex minimization problems

Sanming Liu; Zhijie Wang; Chongyang Liu

doi:10.3934/jimo.2016.12.389

Article Contents

2016, Volume 12, Issue 1: 389-402. Doi: 10.3934/jimo.2016.12.389

This issue Previous Article A criterion for an approximation global optimal solution based on the filled functions Next Article

On convergence analysis of dual proximal-gradient methods with approximate gradient for a class of nonsmooth convex minimization problems

1.
Department of Mathematics and Physics, Shanghai Dianji University, Shanghai, 200240
2.
School of Electric Engineering, Shanghai Dianji University, Shanghai, 200240
3.
School of Mathematics and Information Science, Shandong Institute of Business and Technology, Yantai, 264005

Received: January 2014

Revised: February 2015

Published: January 2016

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Abstract

In this paper, we consider the problem of minimizing a nonsmooth convex objective which is the sum of a proper, nonsmooth, closed, strongly convex extend real-valued function with a proper, nonsmooth, closed, convex extend real-valued function which is a composition of a proper closed convex function and a nonzero affine map. We first establish its dual problem which consists of minimizing the sum of a smooth convex function with a closed proper nonsmooth convex function. Then we apply first order proximal gradient methods on the dual problem, where an error is present in the calculation of the gradient of the smooth term. Further we present a dual proximal-gradient methods with approximate gradient. We show that when the errors are summable although the dual lowest objective function sequence generated by the proximal-gradient method with the errors converges to the optimal value with the rate $O(\frac{1}{k})$, the rate of convergence of the primal sequence is of the order $O(\frac{1}{\sqrt{k}}$).

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Mathematics Subject Classification: Primary: 90C25, 65K05; Secondary: 90C59, 49M29.

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