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arXiv 2104.10347stat.MLcs.LG
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一类可由谱聚类恢复的网络模型

A class of network models recoverable by spectral clustering

University of Washington(华盛顿大学)

Yali Wan, Marina Meila

摘要:

在网络中寻找社区仍然是一个困难的问题,尽管它最近受到了大量的关注。随机块模型(SBM)是一种具有“社区”的图的生成模型,由于其简单性,近年来在理论上的理解进展很快。特别是,已经有各种结果表明,使用图的归一化拉普拉斯算子的简单版本的谱聚类可以以高概率几乎完美地恢复社区。在这里,我们表明,基本上相同的算法用于SBM和它的扩展称为度校正SBM,工作在更广泛的一类块模型,我们称之为偏好框架模型,基本上相同的保证。此外,我们引入的参数化清楚地展示了指定这类模型所需的自由参数,并导致边界更清晰地暴露了控制这类模型中的恢复误差的参数。

英文摘要:

Finding communities in networks is a problem that remains difficult, in spite of the amount of attention it has recently received. The Stochastic Block-Model (SBM) is a generative model for graphs with "communities" for which, because of its simplicity, the theoretical understanding has advanced fast in recent years. In particular, there have been various results showing that simple versions of spectral clustering using the Normalized Laplacian of the graph can recover the communities almost perfectly with high probability. Here we show that essentially the same algorithm used for the SBM and for its extension called Degree-Corrected SBM, works on a wider class of Block-Models, which we call Preference Frame Models, with essentially the same guarantees. Moreover, the parametrization we introduce clearly exhibits the free parameters needed to specify this class of models, and results in bounds that expose with more clarity the parameters that control the recovery error in this model class.

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