# 聚类

## 聚类概念

无监标记分类，数据集D={x1,x2,...xm}，xi=(xi1,xi2,...,xin)：如下图：相似据数聚成类

![img](https://img-blog.csdnimg.cn/20190226214951591.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nNDI1Nzc2MDI0,size_16,color_FFFFFF,t_70)

## 关键

如何描述数据（离散、连续）之间的差异？距离（差异大小）？

多大范围内的距离可被认定成一个类？细分多少个类？

参考：[机器学习距离](/pytorch/ji-suan-ji/ml/wen-da/ml-ju-li.md)


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