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arXiv 1805.02457cs.DS
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拥塞团模型中的$(Δ+1)$染色

$(Δ+1)$ Coloring in the Congested Clique Model

Merav Parter

摘要:

本文针对分布计算中的拥塞团模型中的$(Δ+1)$(顶点)着色问题,提出了一种改进的算法。在该模型中,输入是$n$节点上的图,最初每个节点只知道其关联边,并且每轮每两个节点可以交换$O(\log n)$比特的信息。我们的主要结果是一个随机$(Δ+1)$顶点着色算法,工作在$O(\log\log Δ\cdot \log^* Δ)$轮。这是通过结合\local \模型中[Chang-Li-Pettie,STOC'18]的最新突破性结果和降阶技术来实现的。我们还以很高的概率得到了以下结果:(1)在$O(\log(1/ε)\log^* Δ)$轮内,对任何$ε\in (0,1)$,$Δ=O((n/\log n)^{1-ε})$的$(Δ+1)$ -着色;(2)在$O(\log^* Δ)$轮内,$(Δ+Δ^{1/2+o(1)})$ -着色.转向确定性算法,我们展示了一个$(Δ+1)$着色算法,工作在$O(\log Δ)$轮。

英文摘要:

In this paper, we present improved algorithms for the $(Δ+1)$ (vertex) coloring problem in the Congested-Clique model of distributed computing. In this model, the input is a graph on $n$ nodes, initially each node knows only its incident edges, and per round each two nodes can exchange $O(\log n)$ bits of information. Our key result is a randomized $(Δ+1)$ vertex coloring algorithm that works in $O(\log\log Δ\cdot \log^* Δ)$-rounds. This is achieved by combining the recent breakthrough result of [Chang-Li-Pettie, STOC'18] in the \local\ model and a degree reduction technique. We also get the following results with high probability: (1) $(Δ+1)$-coloring for $Δ=O((n/\log n)^{1-ε})$ for any $ε\in (0,1)$, within $O(\log(1/ε)\log^* Δ)$ rounds, and (2) $(Δ+Δ^{1/2+o(1)})$-coloring within $O(\log^* Δ)$ rounds. Turning to deterministic algorithms, we show a $(Δ+1)$-coloring algorithm that works in $O(\log Δ)$ rounds.

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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