18.04 熵的定义 · 数据挖掘

![](https://img.kancloud.cn/62/36/62369420da56f196cf3d38856730ce62_1417x782.png) ![](https://img.kancloud.cn/1a/31/1a314c5f91fdf4abb854229f47c523d3_1418x778.png) ***** ![](https://img.kancloud.cn/7d/9a/7d9a862031e0db2be10e47131038f992_1320x735.png) ***** ![](https://img.kancloud.cn/81/14/8114714a587ab6c023d3dd3fa87306ae_1430x795.png) ***** |Dik|是特征A取值为i,又是属于k类的样本 ![](https://img.kancloud.cn/01/d2/01d23428988d9cd087c1478d8a849dee_1433x783.png)