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arXiv 1801.04873math.OC
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凸可行性问题的随机projection methods:条件和收敛速度

Randomized projection methods for convex feasibility problems: conditioning and convergence rates

Ion Necoara, Peter Richtarik, Andrei Patrascu

摘要:

在闭凸集集合的交集中寻找一个点,即凸可行性问题,代表了许多计算问题的主要建模策略。在本文中,我们分析了新的随机重新制定的凸可行性问题,以促进新的算法方案的发展。我们还分析了条件问题的参数使用某些(线性)的正则性假设的个人凸集。然后,我们介绍了一个通用的随机投影算法框架,它扩展到随机设置许多现有的投影计划,设计一般凸可行性问题。我们的一般随机投影算法允许同时在几个集合上进行投影,从而提供了很大的灵活性,可以在并行架构上匹配算法的实现。基于条件参数,除了渐近收敛的结果,我们还得到显式的次线性和线性收敛速率的一般算法框架。

英文摘要:

Finding a point in the intersection of a collection of closed convex sets, that is the convex feasibility problem, represents the main modeling strategy for many computational problems. In this paper we analyze new stochastic reformulations of the convex feasibility problem in order to facilitate the development of new algorithmic schemes. We also analyze the conditioning problem parameters using certain (linear) regularity assumptions on the individual convex sets. Then, we introduce a general random projection algorithmic framework, which extends to the random settings many existing projection schemes, designed for the general convex feasibility problem. Our general random projection algorithm allows to project simultaneously on several sets, thus providing great flexibility in matching the implementation of the algorithm on the parallel architecture at hand. Based on the conditioning parameters, besides the asymptotic convergence results, we also derive explicit sublinear and linear convergence rates for this general algorithmic framework.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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