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arXiv 1602.01016cs.SIcs.DSphysics.soc-ph
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基于最大模块度的网络聚类:近似算法及理论极限

Network Clustering via Maximizing Modularity: Approximation Algorithms and Theoretical Limits

Thang N. Dinh, Xiang Li, My T. Thai

摘要:

许多社交网络和复杂系统被发现自然地划分为密集连接的节点的集群,称为社区结构(CS)。寻找CS是网络科学中一个基本而又具有挑战性的课题。解决这个问题的最流行的方法之一是最大化纽曼的模块性。然而,我们对如何近似最大模块度以及找到具有可证明保证的社区结构的含义了解甚少。本文明确地解决了模块聚类的可逼近性问题,证明了除非P = NP,否则在任何(乘性)正因子内逼近该问题是困难的。然而,我们提出了第一个加性近似算法的模块化聚类与一个常数的因素。此外,我们提供了一个严格的证明,CS的模块性任意接近最大模块性QOPT可能承担没有相似的最大模块性的最佳CS。因此,即使找到了具有接近最优模块性的CS,也需要其他验证方法来确认结构的重要性。

英文摘要:

Many social networks and complex systems are found to be naturally divided into clusters of densely connected nodes, known as community structure (CS). Finding CS is one of fundamental yet challenging topics in network science. One of the most popular classes of methods for this problem is to maximize Newman's modularity. However, there is a little understood on how well we can approximate the maximum modularity as well as the implications of finding community structure with provable guarantees. In this paper, we settle definitely the approximability of modularity clustering, proving that approximating the problem within any (multiplicative) positive factor is intractable, unless P = NP. Yet we propose the first additive approximation algorithm for modularity clustering with a constant factor. Moreover, we provide a rigorous proof that a CS with modularity arbitrary close to maximum modularity QOPT might bear no similarity to the optimal CS of maximum modularity. Thus even when CS with near-optimal modularity are found, other verification methods are needed to confirm the significance of the structure.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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