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A combinatorial model and algorithm for globally searching community structure in complex networks

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  • Xiang-Sun Zhang

    (Chinese Academy of Sciences)

  • Zhenping Li

    (Beijing Wuzi University)

  • Rui-Sheng Wang

    (Pennsylvania State University)

  • Yong Wang

    (Chinese Academy of Sciences)

Abstract

Community structure is one of the important characteristics of complex networks. In the recent decade, many models and algorithms have been designed to identify communities in a given network, among which there is a class of methods that globally search the best community structure by optimizing some modularity criteria. However, it has been recently revealed that these methods may either fail to find known qualified communities (a phenomenon called resolution limit) or even yield false communities (the misidentification phenomenon) in some networks. In this paper, we propose a new model which is immune to the above phenomena. The model is constructed by restating community identification as a combinatorial optimization problem. It aims to partition a network into as many qualified communities as possible. This model is formulated as a linear integer programming problem and its NP-completeness is proved. A qualified min-cut based bisecting algorithm is designed to solve this model. Numerical experiments on both artificial networks and real-life complex networks show that the combinatorial model/algorithm has promising performance and can overcome the limitations in existing algorithms.

Suggested Citation

  • Xiang-Sun Zhang & Zhenping Li & Rui-Sheng Wang & Yong Wang, 2012. "A combinatorial model and algorithm for globally searching community structure in complex networks," Journal of Combinatorial Optimization, Springer, vol. 23(4), pages 425-442, May.
    • Handle: RePEc:spr:jcomop:v:23:y:2012:i:4:d:10.1007_s10878-010-9356-0
    DOI: 10.1007/s10878-010-9356-0
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    References listed on IDEAS

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    1. Gergely Palla & Imre Derényi & Illés Farkas & Tamás Vicsek, 2005. "Uncovering the overlapping community structure of complex networks in nature and society," Nature, Nature, vol. 435(7043), pages 814-818, June.
    2. Pablo M. Gleiser & Leon Danon, 2003. "Community Structure In Jazz," Advances in Complex Systems (ACS), World Scientific Publishing Co. Pte. Ltd., vol. 6(04), pages 565-573.
    3. G. Agarwal & D. Kempe, 2008. "Modularity-maximizing graph communities via mathematical programming," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 66(3), pages 409-418, December.
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