Publication Type

Journal Article

Version

acceptedVersion

Publication Date

1-2016

Abstract

Many networks can be modeled as signed graphs. These include social networks, and relationships/interactions networks. Detecting sub-structures in such networks helps us understand user behavior, predict links, and recommend products. In this paper, we detect dense sub-structures from a signed graph, called quasi antagonistic communities (QACs). An antagonistic community consists of two groups of users expressing positive relationships within each group but negative relationships across groups. Instead of requiring complete set of negative links across its groups, a QAC allows a small number of inter-group negative links to be missing. We propose an algorithm, Mascot, to find all maximal quasi antagonistic communities (MQACs). Mascot consists of two stages: pruning and enumeration stages. Based on the properties of QAC, we propose four pruning rules to reduce the size of candidate graphs in the pruning stage. We use an enumeration tree to enumerate all strongly connected subgraphs in a top-down fashion in the second stage before they are used to construct MQACs. We have conducted extensive experiments using synthetic signed graphs and two real networks to demonstrate the efficiency and accuracy of the Mascot algorithm. We have also found that detecting MQACs helps us to predict the signs of links.

Keywords

Bi-clique, Enumeration tree, Power law distribution, Quasi antagonistic community, Signed graph

Discipline

Computer Sciences | Databases and Information Systems | Theory and Algorithms

Research Areas

Data Science and Engineering

Publication

Data Mining and Knowledge Discovery

Volume

30

Issue

1

First Page

99

Last Page

146

ISSN

1384-5810

Identifier

10.1007/s10618-015-0405-2

Publisher

Springer

Copyright Owner and License

Authors

Additional URL

https://doi.org/10.1007/s10618-015-0405-2

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