聚类算法采用的是给定类的个数K,将N个元素(对象)分配到K个类中去使得类内对象之间的相似性最大,而类之间的相似性最小-Clustering algorithm is used to set the number of classes K, the N elements (objects) is assigned to the K classes to make the biggest similarity between objects within the class, and the similarity between the smallest class