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arXiv · 1605.03871

Adapting the Bron-Kerbosch Algorithm for Enumerating Maximal Cliques in Temporal Graphs

Anne-Sophie Himmel·Hendrik Molter·Rolf Niedermeier·Manuel Sorge
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Abstract

Dynamics of interactions play an increasingly important role in the analysis of complex networks. A modeling framework to capture this are temporal graphs which consist of a set of vertices (entities in the network) and a set of time-stamped binary interactions between the vertices. We focus on enumerating delta-cliques, an extension of the concept of cliques to temporal graphs: for a given time period delta, a delta-clique in a temporal graph is a set of vertices and a time interval such that all vertices interact with each other at least after every delta time steps within the time interval. Viard, Latapy, and Magnien [ASONAM 2015, TCS 2016] proposed a greedy algorithm for enumerating all maximal delta-cliques in temporal graphs. In contrast to this approach, we adapt the Bron-Kerbosch algorithm - an efficient, recursive backtracking algorithm which enumerates all maximal cliques in static graphs - to the temporal setting. We obtain encouraging results both in theory (concerning worst-case running time analysis based on the parameter "delta-slice degeneracy" of the underlying graph) as well as in practice with experiments on real-world data. The latter culminates in an improvement for most interesting delte-values concerning running time in comparison with the algorithm of Viard, Latapy, and Magnien.

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Anne-Sophie Himmel, Hendrik Molter, Rolf Niedermeier, Manuel Sorge. 2017-05-02. Adapting the Bron-Kerbosch Algorithm for Enumerating Maximal Cliques in Temporal Graphs. https://arxiv.org/abs/1605.03871

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