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修改分层聚类为层次聚类
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endymecy committed Feb 1, 2018
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# 二分`k-means`算法

  二分`k-means`算法是层次聚类([Hierarchical clustering](https://en.wikipedia.org/wiki/Hierarchical_clustering))的一种,层次聚类是聚类分析中常用的方法。
分层聚类的策略一般有两种
层次聚类的策略一般有两种

- 聚合。这是一种`自底向上`的方法,每一个观察者初始化本身为一类,然后两两结合
- 分裂。这是一种`自顶向下`的方法,所有观察者初始化为一类,然后递归地分裂它们
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