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arXiv 1906.04863cs.LGmath.OCmath.STstat.MLstat.TH
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局部图聚类的统计保证

Statistical guarantees for local graph clustering

University of California at Berkeley(加州大学伯克利分校);University of Waterloo(滑铁卢大学);ICSI(国际计算机科学研究所)

Wooseok Ha, Kimon Fountoulakis, Michael W. Mahoney

摘要:

局部图聚类方法的目标是在非常大的图中找到小的簇。这些方法将一个图和一个种子节点作为输入,并在运行时返回一个良好的集群作为输出,这取决于输出集群的大小,但与输入图的大小无关。在本文中,我们采用了统计的角度对局部图聚类,我们分析了l1正则化PageRank方法的性能~(Fountoulakis et.(见上文)对于单个目标集群的恢复,给定集群内的种子节点。假设目标聚类是由随机模型生成的,我们给出了两个结果。首先,我们证明了l1正则化PageRank的最佳支持恢复了完整的目标集群,具有有界的误报。在第二,我们表明,如果种子节点是唯一连接到目标集群,然后l1正则化PageRank的最佳支持恢复正是目标集群。我们还表明经验,l1正则化PageRank有一个国家的最先进的性能在许多真实的图,证明了该方法的优越性。从计算的角度来看,我们证明了l1正则化PageRank的解决方案路径是单调的。这允许应用前向逐阶段算法,该算法在不依赖于整个图的大小的运行时间中近似解路径。最后,我们表明,l1正则化PageRank和近似个性化PageRank(APPR),另一个非常流行的方法,局部图聚类,是等价的,在这个意义上,我们可以下限和上限的输出与其他的输出之一。基于这种关系,我们建立APPR类似的结果,我们建立l1正则化PageRank。

英文摘要:

Local graph clustering methods aim to find small clusters in very large graphs. These methods take as input a graph and a seed node, and they return as output a good cluster in a running time that depends on the size of the output cluster but that is independent of the size of the input graph. In this paper, we adopt a statistical perspective on local graph clustering, and we analyze the performance of the l1-regularized PageRank method~(Fountoulakis et. al.) for the recovery of a single target cluster, given a seed node inside the cluster. Assuming the target cluster has been generated by a random model, we present two results. In the first, we show that the optimal support of l1-regularized PageRank recovers the full target cluster, with bounded false positives. In the second, we show that if the seed node is connected solely to the target cluster then the optimal support of l1-regularized PageRank recovers exactly the target cluster. We also show empirically that l1-regularized PageRank has a state-of-the-art performance on many real graphs, demonstrating the superiority of the method. From a computational perspective, we show that the solution path of l1-regularized PageRank is monotonic. This allows for the application of the forward stagewise algorithm, which approximates the solution path in running time that does not depend on the size of the whole graph. Finally, we show that l1-regularized PageRank and approximate personalized PageRank (APPR), another very popular method for local graph clustering, are equivalent in the sense that we can lower and upper bound the output of one with the output of the other. Based on this relation, we establish for APPR similar results to those we establish for l1-regularized PageRank.

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