论文标题

分布式距离近似

Distributed Distance Approximation

论文作者

Ancona, Bertie, Censor-Hillel, Keren, Dalirrooyfard, Mina, Efron, Yuval, Williams, Virginia Vassilevska

论文摘要

直径,半径和偏心率是基本图参数,在各种计算设置中进行了广泛的研究。通常,与计算精确解决方案相比,计算近似答案的效率要高得多。在本文中,我们几乎完整地表征了近似比和分布式算法的圆形复杂性之间的权衡,以近似这些参数,重点是加权和定向变体。 此外,我们研究了这些参数的变体\ emph {bi-chrostic}变体,该变体在图表上定义了,其顶点是红色或蓝色的,并且仅着眼于颜色不同的顶点的距离。最近在顺序环境中研究了在计算几何形状,双色直径,半径和偏心率中的应用[Backurs等。 Stoc'18,Dalirrooyfard等。 ICALP'19]。我们为此类问题提供了第一个分布的上限和下限。 我们的技术贡献包括介绍\ emph {近似伪中心}的概念,该概念扩展了[Choudhary和Gold Soda'20]的\ emph {pseudo-Centers},并提出了一种有效的分布式分布的算法,用于计算大约伪centers pseudo-centers。在下边界,我们的构造将新功能的用法引入了从2方通信复杂性到分布式算法的减少框架中。

Diameter, radius and eccentricities are fundamental graph parameters, which are extensively studied in various computational settings. Typically, computing approximate answers can be much more efficient compared with computing exact solutions. In this paper, we give a near complete characterization of the trade-offs between approximation ratios and round complexity of distributed algorithms for approximating these parameters, with a focus on the weighted and directed variants. Furthermore, we study \emph{bi-chromatic} variants of these parameters defined on a graph whose vertices are colored either red or blue, and one focuses only on distances for pairs of vertices that are colored differently. Motivated by applications in computational geometry, bi-chromatic diameter, radius and eccentricities have been recently studied in the sequential setting [Backurs et al. STOC'18, Dalirrooyfard et al. ICALP'19]. We provide the first distributed upper and lower bounds for such problems. Our technical contributions include introducing the notion of \emph{approximate pseudo-center}, which extends the \emph{pseudo-centers} of [Choudhary and Gold SODA'20], and presenting an efficient distributed algorithm for computing approximate pseudo-centers. On the lower bound side, our constructions introduce the usage of new functions into the framework of reductions from 2-party communication complexity to distributed algorithms.

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