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arXiv 1809.09155math.OC
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半定矩阵空间上单调随机变分不等式的一阶方法

A First-order Method for Monotone Stochastic Variational Inequalities on Semidefinite Matrix Spaces

Nahidsadat Majlesinasab, Farzad Yousefian, Mohammad Javad Feizollahi

摘要:

受多用户最优化问题和随机区域中的非合作Nash对策的启发,研究了矩阵空间上的随机变分不等式问题,其中变量为正半定矩阵,映射为单调映射.变分不等式(VI)理论的研究主要集中在向量空间上,然而,现有的方法要么依赖于强假设,要么需要一个双循环框架,在每次迭代中,投影问题,即,需要解决半定最优化问题。出于这个差距,我们开发了一个随机镜像下降法,我们选择的距离生成函数被定义为量子熵。这种方法是一个单循环的一阶方法,在这个意义上,它只需要一个梯度型的更新在每次迭代。这项工作的新颖之处在于通过采用辅助序列的随机阵的收敛性分析。我们的贡献是三方面的:(i)在这种设置下,采用平均技术,我们证明了算法产生的迭代收敛到SVI的弱解;(ii)此外,我们得到了一个关于适当定义的间隙函数的期望值的收敛速度;(iii)我们实现了解决多输入多输出多输出的方法,Cell蜂窝无线网络的七个六边形小区,并给出了数值实验支持所提出的方法的收敛性。

英文摘要:

Motivated by multi-user optimization problems and non-cooperative Nash games in stochastic regimes, we consider stochastic variational inequality (SVI) problems on matrix spaces where the variables are positive semidefinite matrices and the mapping is merely monotone. Much of the interest in the theory of variational inequality (VI) has focused on addressing VIs on vector spaces.Yet, most existing methods either rely on strong assumptions, or require a two-loop framework where at each iteration, a projection problem, i.e., a semidefinite optimization problem needs to be solved. Motivated by this gap, we develop a stochastic mirror descent method where we choose the distance generating function to be defined as the quantum entropy. This method is a single-loop first-order method in the sense that it only requires a gradient-type of update at each iteration. The novelty of this work lies in the convergence analysis that is carried out through employing an auxiliary sequence of stochastic matrices. Our contribution is three-fold: (i) under this setting and employing averaging techniques, we show that the iterate generated by the algorithm converges to a weak solution of the SVI; (ii) moreover, we derive a convergence rate in terms of the expected value of a suitably defined gap function; (iii) we implement the developed method for solving a multiple-input multiple-output multi-cell cellular wireless network composed of seven hexagonal cells and present the numerical experiments supporting the convergence of the proposed method.

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