为判断聚类结果质量的好坏，需要一个客观的评价指标来评价聚类结果的合理性。聚类性能评价方法通常分为三种：外部评价法，内部评价法，相对评价法。外部评价法将聚类结果得到类标签和已知类标签进行比较，此评价法的前提是数据集样本的类标签已知-In order to judge the quality of clustering results, good or bad, the need for an objective evaluation to assess the reasonableness of

K-M tree一种使用在聚类算法中的二叉树结构- KM tree clustering algorithm for use in a binary tree structure