Davies Bouldin index戴维森堡丁指数做数据挖掘的时候，经常你不知道要做多少个Cluster，那么你就需要先按照大体构想来分那么几种测试性聚类，通过计算这个指数，来确定到底哪个Cluster最合理。当然，算法并没有十全十美的，你只能说是理论上合理了，实际这个指数能给别人多大帮助我自己真的也不得而知。-Davies Bouldin index 戴维森堡丁 index for data mining, often you do not know how many Cluster, then you need to follow a generally conceived to so few points testability clustering by calculating this index, which is determined in the end Cluster the most reasonable. Of course, the algorithm is not perfect, you can only say that a reasonable theory, this index actually give to others much help I really have no idea.