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Distributed Distance Approximation

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



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Bertie Ancona
  • MIT, Cambridge, MA, USA
Keren Censor-Hillel
  • Technion, Haifa, Israel
Mina Dalirrooyfard
  • MIT, Cambridge, MA, USA
Yuval Efron
  • Technion, Haifa, Israel
Virginia Vassilevska Williams
  • MIT, Cambridge, MA, USA

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Bertie Ancona, Keren Censor-Hillel, Mina Dalirrooyfard, Yuval Efron, and Virginia Vassilevska Williams. Distributed Distance Approximation. In 24th International Conference on Principles of Distributed Systems (OPODIS 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 184, pp. 30:1-30:17, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2021)
https://doi.org/10.4230/LIPIcs.OPODIS.2020.30

Abstract

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 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 approximate pseudo-center, which extends the 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.

Subject Classification

ACM Subject Classification
  • Theory of computation
Keywords
  • Distributed Computing
  • Distance Computation
  • Algorithms
  • Lower Bounds

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