论文标题

图案切断稀疏器

Motif Cut Sparsifiers

论文作者

Kapralov, Michael, Makarov, Mikhail, Silwal, Sandeep, Sohler, Christian, Tardos, Jakab

论文摘要

图案是给定的有导或无向图$ g $的经常发生的子图。主题捕获了$ g $的高阶组织结构,超出了边缘关系,因此发现了广泛的应用程序,例如在图中,社区检测以及对生物和物理网络的分析,仅举几例。在这些应用中,基序的剪切结构起着至关重要的作用,因为顶点通过削减的割簇分配到集群中,其电导是基于特定基序的实例数量,而不是仅仅是边缘数量,而是越过切割。 在本文中,我们介绍了图案切割稀疏器的概念。 We show that one can compute in polynomial time a sparse weighted subgraph $G'$ with only $\widetilde{O}(n/ε^2)$ edges such that for every cut, the weighted number of copies of $M$ crossing the cut in $G'$ is within a $1+ε$ factor of the number of copies of $M$ crossing the cut in $G$, for every constant size motif $M$. 我们的工作仔细结合了图形稀疏和超图稀疏的观点。我们采样的边缘需要我们扩展并加强在基序设置的开创性工作中引入的切割稀疏器的概念。我们通过从超图像的强大连通性值中得出超图形的强烈连接概率,该概率通过超码的强度代表主题实例来调整重要性采样框架。最后,受两个观点启发的迭代稀疏原始化均用于将$ g $中的边缘数减少到几乎线性。 此外,我们提出了强大的下限,排除了相似的结果,即相对于诱导的基序发生。

A motif is a frequently occurring subgraph of a given directed or undirected graph $G$. Motifs capture higher order organizational structure of $G$ beyond edge relationships, and, therefore, have found wide applications such as in graph clustering, community detection, and analysis of biological and physical networks to name a few. In these applications, the cut structure of motifs plays a crucial role as vertices are partitioned into clusters by cuts whose conductance is based on the number of instances of a particular motif, as opposed to just the number of edges, crossing the cuts. In this paper, we introduce the concept of a motif cut sparsifier. We show that one can compute in polynomial time a sparse weighted subgraph $G'$ with only $\widetilde{O}(n/ε^2)$ edges such that for every cut, the weighted number of copies of $M$ crossing the cut in $G'$ is within a $1+ε$ factor of the number of copies of $M$ crossing the cut in $G$, for every constant size motif $M$. Our work carefully combines the viewpoints of both graph sparsification and hypergraph sparsification. We sample edges which requires us to extend and strengthen the concept of cut sparsifiers introduced in the seminal work of to the motif setting. We adapt the importance sampling framework through the viewpoint of hypergraph sparsification by deriving the edge sampling probabilities from the strong connectivity values of a hypergraph whose hyperedges represent motif instances. Finally, an iterative sparsification primitive inspired by both viewpoints is used to reduce the number of edges in $G$ to nearly linear. In addition, we present a strong lower bound ruling out a similar result for sparsification with respect to induced occurrences of motifs.

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