Clustering is an unsupervised learning method. The task of clustering is to group the data by the given similarity such that the data in the same group are similar with each other and dissimilar with the ones in different group. 聚类是一种无监督的学习,其任务是按照给定的相似性将数据分组,使得同组数据彼此相似而不同组数据不相似。