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Mining communities in networks

Kwak, Haewoon and Choi, Yoonchan and Eom, Young-Ho and Jeong, Hawoong and Moon, Sue Mining communities in networks. In: Proceedings of the 9th ACM SIGCOMM conference on Internet measurement conference - IMC '09. ACM, pp. 301-314. ISBN 978-1-60558-771-4 (2009)

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Online social networks pose significant challenges to computer scientists, physicists, and sociologists alike, for their massive size, fast evolution, and uncharted potential for social computing. One particular problem that has interested us is community identification. Many algorithms based on various metrics have been proposed for communities in networks [18, 24], but a few algorithms scale to very large networks. Three recent community identification algorithms, namely CNM [16], Wakita [59], and Louvain [10], stand out for their scalability to a few millions of nodes. All of them use modularity as the metric of optimization. However, all three algorithms produce inconsistent communities every time the ordering of nodes to the algorithms changes. We propose two quantitative metrics to represent the level of consistency across multiple runs of an algorithm: pairwise membership probability and consistency. Based on these two metrics, we propose a solution that improves the consistency without compromising the modularity. We demonstrate that our solution to use pairwise membership probabilities as link weights generates consistent communities within six or fewer cycles for most networks. However, our iterative, pairwise membership reinforcing approach does not deliver convergence for Flickr, Orkut, and Cyworld networks as well for the rest of the networks. Our approach is empirically driven and is yet to be shown to produce consistent output analytically. We leave further investigation into the topological structure and its impact on the consistency as future work. In order to evaluate the quality of clustering, we have looked at 3 of the 48 communities identified in the AS graph. Surprisingly, all have either hierarchical, geographical, or topological interpretations to their groupings. Our preliminary evaluation of the quality of communities is promising. We plan to conduct more thorough evaluation of the communities and study network structures and their evolutions using our approach.

Item Type: Book Section
Identification Number: 10.1145/1644893.1644930
Uncontrolled Keywords: Community, Modularity, CNM, Wakita, Louvain, Social networks, Consistent community identification, AS graph
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Q Science > QC Physics
Research Area: Computer Science and Applications
Depositing User: Ms T. Iannizzi
Date Deposited: 02 Dec 2014 15:15
Last Modified: 18 Dec 2014 13:56
URI: http://eprints.imtlucca.it/id/eprint/2384

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