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arXiv 1508.04747cs.DScs.DC
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近优分布最大流

Near-Optimal Distributed Maximum Flow

Mohsen Ghaffari, Andreas Karrenbauer, Fabian Kuhn, Christoph Lenzen, Boaz Patt-Shamir

摘要:

我们提出了一个接近最优的分布式算法$(1+o(1))$ -近似的单商品最大流的无向加权网络,运行在$(D+ \sqrt{n})\cdot n^{o(1)}$通信轮的\Congest模型。这里,$n$和$D$分别表示节点数和网络直径。这是对$O(n^2)$的平凡界的第一次改进,并且它几乎匹配$\tildeΩ(D+ \sqrt{n})$轮复杂度下限。该算法的发展包含两个结果的独立利益:(i)一个$(D+\sqrt{n})\cdot n^{o(1)}$轮分布式构造的生成树的平均拉伸$n^{o(1)}$。(ii)由$O(\log n)$虚拟树引起的割组成的$n^{o(1)}$拥塞逼近器的$(D+\sqrt{n})\cdot n^{o(1)}$轮分布式构造.切割逼近器的分布式表示允许在$(D+\sqrt{n})\cdot n^{o(1)}$轮次中进行评估。我们所有的算法都利用了随机性,并以很高的概率成功。

英文摘要:

We present a near-optimal distributed algorithm for $(1+o(1))$-approximation of single-commodity maximum flow in undirected weighted networks that runs in $(D+ \sqrt{n})\cdot n^{o(1)}$ communication rounds in the \Congest model. Here, $n$ and $D$ denote the number of nodes and the network diameter, respectively. This is the first improvement over the trivial bound of $O(n^2)$, and it nearly matches the $\tildeΩ(D+ \sqrt{n})$ round complexity lower bound. The development of the algorithm contains two results of independent interest: (i) A $(D+\sqrt{n})\cdot n^{o(1)}$-round distributed construction of a spanning tree of average stretch $n^{o(1)}$. (ii) A $(D+\sqrt{n})\cdot n^{o(1)}$-round distributed construction of an $n^{o(1)}$-congestion approximator consisting of the cuts induced by $O(\log n)$ virtual trees. The distributed representation of the cut approximator allows for evaluation in $(D+\sqrt{n})\cdot n^{o(1)}$ rounds. All our algorithms make use of randomization and succeed with high probability.

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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