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arXiv 1808.04723math.OC
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公共不动点问题的异步序列惯性迭代法及其在线性系中的应用

Asynchronous Sequential Inertial Iterations for Common Fixed Points Problems with an Application to Linear Systems

Howard Heaton, Yair Censor

摘要:

公共不动点问题要求在有限算子集合的不动点集合的交集中找到一个点。快速解决这类问题对于工程和科学任务具有重要的实际意义(例如,用于计算机断层扫描)。求解这些问题的迭代法通常采用Krasnosel'ski \u-Mann型迭代。我们提出了一个异步序列惯性(ASI)算法框架,在希尔伯特空间中解决常见的不动点问题的非扩张算子的集合。我们的计划允许使用过时的迭代生成更新时,从而使处理节点同时工作,没有同步。该方法还包括惯性型外推项,以提高收敛速度。特别地,我们扩展了最近的ARock算法”[Peng,Z.等人,SIAM J. on Scientific Computing 38,A2851-2879,(2016)]中。ASI算法的收敛性证明,没有假设的延迟的分布,但他们是一致有界的。讨论提供了一个计算的例子,显示的性能的ASI算法与对角松弛正交投影(DROP)算法估计的解决方案,以大型线性系。

英文摘要:

The common fixed points problem requires finding a point in the intersection of fixed points sets of a finite collection of operators. Quickly solving problems of this sort is of great practical importance for engineering and scientific tasks (e.g., for computed tomography). Iterative methods for solving these problems often employ a Krasnosel'ski\uı-Mann type iteration. We present an Asynchronous Sequential Inertial (ASI) algorithmic framework in a Hilbert space to solve common fixed points problems with a collection of nonexpansive operators. Our scheme allows use of out-of-date iterates when generating updates, thereby enabling processing nodes to work simultaneously and without synchronization. This method also includes inertial type extrapolation terms to increase the speed of convergence. In particular, we extend the application of the recent ARock algorithm" [Peng, Z. et al, SIAM J. on Scientific Computing 38, A2851-2879, (2016)] in the context of convex feasibility problems. Convergence of the ASI algorithm is proven with no assumption on the distribution of delays, except that they be uniformly bounded. Discussion is provided along with a computational example showing the performance of the ASI algorithm applied in conjunction with a diagonally relaxed orthogonal projections (DROP) algorithm for estimating solutions to large linear systems.

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