论文标题
使用Turán阴影可证明有效地近似近似:花生
Provably and Efficiently Approximating Near-cliques using the Turán Shadow: PEANUTS
论文作者
论文摘要
集团和近乎固定的计数是重要的图形属性,具有图形生成,图形建模,图形分析,社区检测等中的应用。它们是密集子图的原型例子。虽然对近乎固定的定义有几种不同的定义,但其中大多数共享属性,即它们是缺少少数边缘的集团。集团计数本身被认为是一个具有挑战性的问题。计数近乎固定的数量要大得多,因此,由于近距离的搜索空间比集团大的数量级。 我们给出了一个近似固定的集团的表述,该集团缺少恒定数量的边缘。我们利用了一个近似较小的集团的事实,并将技术用于集体采样来计数近乎关注的问题。这种方法使我们能够在具有数千万边缘的图中计数1或2个缺失边缘的近固定。据我们所知,对于此问题,没有已知的有效方法,并且在现有算法上,我们获得了10倍至100倍的速度,以计算近乎固定的算法。 我们的主要技术是Jain和Seshadhri最近引入的Turán影子采样方法的太空改编(www 2017)。这种方法构建了一棵大的递归树(称为Turán阴影),该树代表图中的集团。我们设计了一种新颖的算法,该算法使用Turán影子的在线紧凑型结构来构建近距离的估计器。
Clique and near-clique counts are important graph properties with applications in graph generation, graph modeling, graph analytics, community detection among others. They are the archetypal examples of dense subgraphs. While there are several different definitions of near-cliques, most of them share the attribute that they are cliques that are missing a small number of edges. Clique counting is itself considered a challenging problem. Counting near-cliques is significantly harder more so since the search space for near-cliques is orders of magnitude larger than that of cliques. We give a formulation of a near-clique as a clique that is missing a constant number of edges. We exploit the fact that a near-clique contains a smaller clique, and use techniques for clique sampling to count near-cliques. This method allows us to count near-cliques with 1 or 2 missing edges, in graphs with tens of millions of edges. To the best of our knowledge, there was no known efficient method for this problem, and we obtain a 10x - 100x speedup over existing algorithms for counting near-cliques. Our main technique is a space-efficient adaptation of the Turán Shadow sampling approach, recently introduced by Jain and Seshadhri (WWW 2017). This approach constructs a large recursion tree (called the Turán Shadow) that represents cliques in a graph. We design a novel algorithm that builds an estimator for near-cliques, using an online, compact construction of the Turán Shadow.