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arXiv 0704.3759physics.soc-phphysics.comp-ph
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以高分辨率识别网络社区

Identifying network communities with a high resolution

Jianhua Ruan, Weixiong Zhang

摘要:

社团结构是复杂网络的一个重要性质。这种结构的自动发现是许多学科的基本任务,包括社会学,生物学,工程学和计算机科学。最近,已经提出了几个社区发现算法的基础上优化的数量称为模块度(Q)。然而,模块化优化问题是NP-难的,现有的方法往往具有运行时间长或质量差的缺点。此外,最近已经指出,基于优化Q的算法将具有分辨率限制,即,低于一定规模的社区可能检测不到。在本研究中,我们首先提出一个有效的启发式演算法Qcut,结合频谱图分割与局部搜寻来优化Q。使用合成和真实的网络,我们表明,Qcut可以找到更高的模块性,比现有的算法更具可扩展性。此外,使用Qcut作为一个必要的组成部分,我们提出了一个递归算法,HQcut,解决分辨率限制问题。我们表明,HQcut可以成功地检测社区在一个更精细的规模和更高的精度比现有的算法。最后,我们应用Qcut和HQcut来研究蛋白质-蛋白质相互作用网络,并表明这两种算法的组合可以揭示有趣的生物学结果,否则可能无法检测到。

英文摘要:

Community structure is an important property of complex networks. An automatic discovery of such structure is a fundamental task in many disciplines, including sociology, biology, engineering, and computer science. Recently, several community discovery algorithms have been proposed based on the optimization of a quantity called modularity (Q). However, the problem of modularity optimization is NP-hard, and the existing approaches often suffer from prohibitively long running time or poor quality. Furthermore, it has been recently pointed out that algorithms based on optimizing Q will have a resolution limit, i.e., communities below a certain scale may not be detected. In this research, we first propose an efficient heuristic algorithm, Qcut, which combines spectral graph partitioning and local search to optimize Q. Using both synthetic and real networks, we show that Qcut can find higher modularities and is more scalable than the existing algorithms. Furthermore, using Qcut as an essential component, we propose a recursive algorithm, HQcut, to solve the resolution limit problem. We show that HQcut can successfully detect communities at a much finer scale and with a higher accuracy than the existing algorithms. Finally, we apply Qcut and HQcut to study a protein-protein interaction network, and show that the combination of the two algorithms can reveal interesting biological results that may be otherwise undetectable.

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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