摘要 重叠社团在社交网络大数据中普遍存在.针对现有重叠社团挖掘算法易将重叠区域错误地划分为独立的社团且计算复杂的问题，提出了一种基于局部信息度量的快速重叠社团挖掘算法（Local information based Fast Overlapped Communities Detection，Li-FOCD）.首先，为节点定义局部信息度量指标——社团连接度和邻居连接度，建模节点与社团的关系，缩小了计算范围；然后，每次并行地迭代执行缩减、扩展、去重等操作，并更新局部度量指标，通过松弛每次迭代的终止条件，发现近似最优社团集合而不是最优社团，最终算法复杂度为O（m+n）.基于真实的大规模社交网络数据的试验分析表明：与当前流行的重叠社团挖掘算法相比，Li-FOCD在不损失检测质量的前提下，大幅提升了计算效率.
Abstract：Overlap between community pairs is commonplace in large-scale social networks.The most existing overlapped community detection algorithms may falsely identify overlaps as communities because the overlap area is denser than others,and those algorithms are computationally demanding and cannot scale well with the size of networks.In this paper,we propose a fast overlapping community discovery algorithm based on some locally computed information-Local information based Fast Overlapped Communities Detection (Li-FOCD).Firstly,we introduce two local information metrics for each network node-community connectivity score and neighborhood connectivity score,to model the relationship between nodes and communities;secondly,based on local metrics,we can concurrently execute the iterations of reduction,expansion,and duplication removal to find the approximately optimal communities instead of the optimal community,and achieve a low complexity O(m+n).Experimental analysis based on real large-scale social networking datasets shows that our algorithm outperforms some popular overlapped community finding algorithms in terms of computational time while not compromising with quality.
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2019, Vol. 47 
