Benchmarks for testing community detection algorithms on directed and weighted graphs with overlapping communities

Details Benchmarks for testing community detection algorithms on directed and weighted graphs with overlapping communities Benchmarks for testing community detection algorithms on directed and weighted graphs with overlapping communities

2009-04-24

arxiv.org/abs/0904.3940v2

Physical Review E80, 016118 (2009)

Physics

Physics and Society

9 pages, 13 figures. Final version published in Physical Review E. The code to create the benchmark graphs can be freely downl

Scientific paper

10.1103/PhysRevE.80.016118

Many complex networks display a mesoscopic structure with groups of nodes sharing many links with the other nodes in their group and comparatively few with nodes of different groups. This feature is known as community structure and encodes precious information about the organization and the function of the nodes. Many algorithms have been proposed but it is not yet clear how they should be tested. Recently we have proposed a general class of undirected and unweighted benchmark graphs, with heterogenous distributions of node degree and community size. An increasing attention has been recently devoted to develop algorithms able to consider the direction and the weight of the links, which require suitable benchmark graphs for testing. In this paper we extend the basic ideas behind our previous benchmark to generate directed and weighted networks with built-in community structure. We also consider the possibility that nodes belong to more communities, a feature occurring in real systems, like, e. g., social networks. As a practical application, we show how modularity optimization performs on our new benchmark.

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