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arXiv 2005.09953math.OC
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带线性约束的两块可分凸优化问题的动力学方法

A Dynamical Approach to Two-Block Separable Convex Optimization Problems with Linear Constraints

Sandy Bitterlich, Ernö Robert Csetnek, Gert Wanka

摘要:

本文的目的是通过一阶微分方程/包含凸规划问题的两块可分离的线性约束和目标,其中(至少)的一个组件,后者被假定为强凸。目标的每个块包含进一步的光滑凸函数。我们研究了所提出的动力系统,并证明了其轨迹渐近收敛到凸优化问题拉格朗日量的鞍点。动力系统的时间离散化导致交替最小化算法AMA,也最近在文献中介绍了它的近端变体。

英文摘要:

The aim of this manuscript is to approach by means of first order differential equations/inclusions convex programming problems with two-block separable linear constraints and objectives, whereby (at least) one of the components of the latter is assumed to be strongly convex. Each block of the objective contains a further smooth convex function. We investigate the dynamical system proposed and prove that its trajectories asymptotically converge to a saddle point of the Lagrangian of the convex optimization problem. Time discretization of the dynamical system leads to the alternating minimization algorithm AMA and also to its proximal variant recently introduced in the literature.

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