arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1908.09867cs.SIphysics.soc-ph
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复杂网络中社团结构的一致性

Consistency of community structure in complex networks

Maria A. Riolo, M. E. J. Newman

摘要:

网络中最广泛使用的社区发现技术,包括基于模块化、统计推断和信息论论证的方法,都是通过优化衡量网络分区质量的目标函数来工作的。然而,有一个很好的理由可以证明,在这样一个目标函数下,人们不应该只看单一的最佳社区结构,而应该选择得分高的结构。如果这样做,人们通常会发现所得的结构显示出相当大的变化,这已经被认为是这些社区发现方法不可靠的证据,因为它们似乎不能给出一致的答案。在这里,我们认为,经过仔细检查,发现的结构实际上是一致的,在某种程度上。具体来说,我们表明,他们都可以组装从一组底层的“积木”,组的网络节点,通常被发现在同一个社区。不同的群落结构对应于不同的区块排列,但区块本身在很大程度上是不变的。我们提出了一个信息理论的方法,发现在特定的网络中的构建块,并证明了它与几个示例应用程序。我们的结论是,传统的社区发现并不像有些人认为的那样失败,事实上,它对网络结构提供了大量的洞察力,尽管可能并不完全像以前想象的那样。

英文摘要:

The most widely used techniques for community detection in networks, including methods based on modularity, statistical inference, and information theoretic arguments, all work by optimizing objective functions that measure the quality of network partitions. There is a good case to be made, however, that one should not look solely at the single optimal community structure under such an objective function, but rather at a selection of high-scoring structures. If one does this one typically finds that the resulting structures show considerable variation, and this has been taken as evidence that these community detection methods are unreliable, since they do not appear to give consistent answers. Here we argue that, upon closer inspection, the structures found are in fact consistent in a certain way. Specifically, we show that they can all be assembled from a set of underlying "building blocks", groups of network nodes that are usually found together in the same community. Different community structures correspond to different arrangements of blocks, but the blocks themselves are largely invariant. We propose an information theoretic method for discovering the building blocks in specific networks and demonstrate it with several example applications. We conclude that traditional community detection is not the failure some have suggested it is, and that in fact it gives a significant amount of insight into network structure, although perhaps not in exactly the way previously imagined.

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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