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arXiv 1407.7882cs.DCcs.DS
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有界度图的分布式最大匹配

Distributed Maximum Matching in Bounded Degree Graphs

Guy Even, Moti Medina, Dana Ron

摘要:

我们提出了确定性分布式算法计算近似最大基数匹配和近似最大权重匹配。我们的算法为未加权的情况下计算匹配的大小至少是$(1-\eps)$倍的最佳$Δ^{O(1/\eps)} + O\left(\frac{1}{\eps^2}\right) \cdot\log^*(n)$轮,其中$n$是图中的顶点数和$Δ$是最大程度。我们的算法的边缘加权的情况下计算匹配的权重至少是$(1-\eps)$倍的最佳在$\log(\min\{1/\wmin,n/\eps\})^{O(1/\eps)}\cdot(Δ^{O(1/\eps)}+\log^*(n))$轮的边缘权重在$[\wmin,1]$。对于未加权情况和加权情况的最佳先前算法是Lotker,Patt-Shamir和Pettie~(SPAA 2008)。对于未加权的情况下,他们给出了一个随机$(1-\eps)$近似算法,运行在$O((\log(n)) /\eps^3)$轮。对于加权的情况下,他们给出了一个随机$(1/2-\eps)$近似算法,运行在$O(\log(\eps^{-1}) \cdot \log(n))$轮。因此,我们的结果改善了以前的参数$Δ$,$\eps$和$\wmin$是常数(其中我们减少了运行次数从$O(\log(n))$到$O(\log^*(n))$),更一般地当$Δ$,$1/\eps$和$1/\wmin$是足够慢的$n$增加功能。此外,我们的算法是确定性的,而不是随机的。

英文摘要:

We present deterministic distributed algorithms for computing approximate maximum cardinality matchings and approximate maximum weight matchings. Our algorithm for the unweighted case computes a matching whose size is at least $(1-\eps)$ times the optimal in $Δ^{O(1/\eps)} + O\left(\frac{1}{\eps^2}\right) \cdot\log^*(n)$ rounds where $n$ is the number of vertices in the graph and $Δ$ is the maximum degree. Our algorithm for the edge-weighted case computes a matching whose weight is at least $(1-\eps)$ times the optimal in $\log(\min\{1/\wmin,n/\eps\})^{O(1/\eps)}\cdot(Δ^{O(1/\eps)}+\log^*(n))$ rounds for edge-weights in $[\wmin,1]$. The best previous algorithms for both the unweighted case and the weighted case are by Lotker, Patt-Shamir, and Pettie~(SPAA 2008). For the unweighted case they give a randomized $(1-\eps)$-approximation algorithm that runs in $O((\log(n)) /\eps^3)$ rounds. For the weighted case they give a randomized $(1/2-\eps)$-approximation algorithm that runs in $O(\log(\eps^{-1}) \cdot \log(n))$ rounds. Hence, our results improve on the previous ones when the parameters $Δ$, $\eps$ and $\wmin$ are constants (where we reduce the number of runs from $O(\log(n))$ to $O(\log^*(n))$), and more generally when $Δ$, $1/\eps$ and $1/\wmin$ are sufficiently slowly increasing functions of $n$. Moreover, our algorithms are deterministic rather than randomized.

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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