算法描述： K均值算法： 给定类的个数K，将N个对象分到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。-Algorithm Descr iption: K-means algorithm: the number of a given type of K, will be assigned to N objects of class K to make class the similarities between objects the most, while