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arXiv 1705.04518stat.ME
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混合隶属随机块模型邻接谱嵌入的一致性

Consistency of adjacency spectral embedding for the mixed membership stochastic blockmodel

Patrick Rubin-Delanchy, Carey E. Priebe, Minh Tang

摘要:

混合隶属度随机块模型是图的统计模型,其通过允许每个节点在每次做出是否形成边的决定时随机选择不同的社区来扩展随机块模型。而随机块模型的谱分析越来越完善,理论的混合成员的情况下是相当少的发展。在这里,我们表明,邻接谱嵌入到$\mathbb{R}^k$,其次是拟合的最小体积包围凸$k$ -多面体的$k-1$主成分,导致相合估计$k$ -社区混合成员随机块模型。关键是确定混合隶属度随机块模型和随机点积图之间的直接对应关系,这极大地方便了理论分析。具体地说,利用随机点积图的$2 \rightarrow \infty$范数和中心极限定理分别证明了该方法的一致性和部分纠正了该方法的偏差.

英文摘要:

The mixed membership stochastic blockmodel is a statistical model for a graph, which extends the stochastic blockmodel by allowing every node to randomly choose a different community each time a decision of whether to form an edge is made. Whereas spectral analysis for the stochastic blockmodel is increasingly well established, theory for the mixed membership case is considerably less developed. Here we show that adjacency spectral embedding into $\mathbb{R}^k$, followed by fitting the minimum volume enclosing convex $k$-polytope to the $k-1$ principal components, leads to a consistent estimate of a $k$-community mixed membership stochastic blockmodel. The key is to identify a direct correspondence between the mixed membership stochastic blockmodel and the random dot product graph, which greatly facilitates theoretical analysis. Specifically, a $2 \rightarrow \infty$ norm and central limit theorem for the random dot product graph are exploited to respectively show consistency and partially correct the bias of the procedure.

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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