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arXiv 1507.01845cs.DC
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拜占庭式多代理优化:部分II

Byzantine Multi-Agent Optimization: Part II

Lili Su, Nitin Vaidya

摘要:

在本报告的第一部分,我们介绍了拜占庭容错分布式优化问题,其目标是优化凸(成本)函数与实值标量输入/输出的总和。在这第二部分中,我们介绍了一个基于条件的变体的原始问题在任意有向图。具体地,对于给定的$k$输入函数$h_1(x), \ldots, h_k(x)$的集合,我们考虑当存储在代理$j$处的由$g_j(x)$表示的本地成本函数被形成为$k$输入函数$h_1(x), \ldots, h_k(x)$的凸组合时的情形。这个基于条件的问题的目标是生成$\frac{1}{k}\sum_{i=1}^k h_i(x)$的最优输出。根据每个代理处的边信息的可用性,考虑两个稍微不同的变体。我们表明,对于一个给定的图,问题确实可以解决,尽管存在故障代理。特别是,即使在每个代理的侧信息的情况下,当足够的冗余是在输入函数的最优值,提出了一种分布式算法,其中每个代理进行最小状态跨迭代。

英文摘要:

In Part I of this report, we introduced a Byzantine fault-tolerant distributed optimization problem whose goal is to optimize a sum of convex (cost) functions with real-valued scalar input/ouput. In this second part, we introduce a condition-based variant of the original problem over arbitrary directed graphs. Specifically, for a given collection of $k$ input functions $h_1(x), \ldots, h_k(x)$, we consider the scenario when the local cost function stored at agent $j$, denoted by $g_j(x)$, is formed as a convex combination of the $k$ input functions $h_1(x), \ldots, h_k(x)$. The goal of this condition-based problem is to generate an output that is an optimum of $\frac{1}{k}\sum_{i=1}^k h_i(x)$. Depending on the availability of side information at each agent, two slightly different variants are considered. We show that for a given graph, the problem can indeed be solved despite the presence of faulty agents. In particular, even in the absence of side information at each agent, when adequate redundancy is available in the optima of input functions, a distributed algorithm is proposed in which each agent carries minimal state across iterations.

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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