arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2204.07720cs.SI
收藏

DMCS:基于密度模块化的社区搜索

DMCS : Density Modularity based Community Search

Junghoon Kim, Siqiang Luo, Gao Cong, Wenyuan Yu

摘要:

社区搜索,或者在社交网络中找到包含给定查询节点的连通子图(称为社区),是一个基本问题。现有的社区搜索模型大多只关注社区内部的凝聚力。然而,高质量的社区通常具有高模块性,这意味着社区内部的连接密集,而社区外部的节点连接稀疏。在本文中,我们进行了一个开拓性的研究,寻找一个社区与高模块化。我们指出,虽然模块化已被广泛用于社区发现(无查询节点),它还没有被采用的社区搜索,令人惊讶的是,它的应用在社区搜索(相关的查询节点)带来了新的挑战。我们通过设计一个新的图模块度函数密度模块度来解决这些挑战。据我们所知,这是第一个使用图模块化的社区搜索问题的工作。基于密度模块度的社区搜索,简称DMCS,是在一个包含所有查询节点的社会网络中寻找一个密度模块度高的社区。我们证明了DMCS问题是NP-困难的。为了有效地解决DMCS,我们提出了新的算法,运行在对数线性时间的图的大小。我们在真实世界和合成网络中进行了广泛的实验研究,从而深入了解我们算法的效率和有效性。特别是,我们的算法实现高达8.5倍的精度NMI比基线算法。

英文摘要:

Community Search, or finding a connected subgraph (known as a community) containing the given query nodes in a social network, is a fundamental problem. Most of the existing community search models only focus on the internal cohesiveness of a community. However, a high-quality community often has high modularity, which means dense connections inside communities and sparse connections to the nodes outside the community. In this paper, we conduct a pioneer study on searching a community with high modularity. We point out that while modularity has been popularly used in community detection (without query nodes), it has not been adopted for community search, surprisingly, and its application in community search (related to query nodes) brings in new challenges. We address these challenges by designing a new graph modularity function named Density Modularity. To the best of our knowledge, this is the first work on the community search problem using graph modularity. The community search based on the density modularity, termed as DMCS, is to find a community in a social network that contains all the query nodes and has high density-modularity. We prove that the DMCS problem is NP-hard. To efficiently address DMCS, we present new algorithms that run in log-linear time to the graph size. We conduct extensive experimental studies in real-world and synthetic networks, which offer insights into the efficiency and effectiveness of our algorithms. In particular, our algorithm achieves up to 8.5 times higher accuracy in terms of NMI than baseline algorithms.

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。

↑