legclust 聚类算法 IEEE TPAMI上的文章 首先建立邻近矩阵 然后基于图的连通分量的层次聚类-clustering J.M. Santos et al., LEGClust—a clustering algorithm based on layered entropic subgraphs, IEEE TPAMI, Vol.30, NO.1, 2008, 1-13