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arXiv 1409.2186cs.SIphysics.soc-ph
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随机块模型下社区可检测性的普适相变

Universal Phase Transition in Community Detectability under a Stochastic Block Model

Pin-Yu Chen, Alfred O. Hero

摘要:

我们证明了谱模块化方法中社区可检测性的渐近相变阈值的存在性[M。E. J.Newman,Phys.Rev.E74,036104(2006)和Proc.National Academy of Sciences. 103,8577(2006)]中的随机块模型。随着社区间边缘连接概率$p$的增长,社区可检测性发生相变。该相变将小$p$的次临界状态(其中基于模块的社区检测成功地识别社区)与大$p$的超临界状态(其中成功的社区发现是不可能的)分开。我们发现,随着社区规模变大,渐近相变阈值$p^*$等于$\sqrt{p_1\cdot p_2}$,其中$p_i~(i=1,2)$是社区内边缘连接概率。因此,相变阈值是普遍的,在这个意义上,它不依赖于社区大小的比例。通过对中等规模社区的模拟,验证了普遍的相变现象。使用推导出的相变阈值的表达式,我们提出了一个经验的方法来估计这个阈值从现实世界的数据。

英文摘要:

We prove the existence of an asymptotic phase transition threshold on community detectability for the spectral modularity method [M. E. J. Newman, Phys. Rev. E 74, 036104 (2006) and Proc. National Academy of Sciences. 103, 8577 (2006)] under a stochastic block model. The phase transition on community detectability occurs as the inter-community edge connection probability $p$ grows. This phase transition separates a sub-critical regime of small $p$, where modularity-based community detection successfully identifies the communities, from a super-critical regime of large $p$ where successful community detection is impossible. We show that, as the community sizes become large, the asymptotic phase transition threshold $p^*$ is equal to $\sqrt{p_1\cdot p_2}$, where $p_i~(i=1,2)$ is the within-community edge connection probability. Thus the phase transition threshold is universal in the sense that it does not depend on the ratio of community sizes. The universal phase transition phenomenon is validated by simulations for moderately sized communities. Using the derived expression for the phase transition threshold we propose an empirical method for estimating this threshold from real-world data.

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