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@SmirkCao
SmirkCao committed Nov 15, 2018
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Expand Up @@ -66,8 +66,9 @@ $$
g(D,A)=H(D)-H(D|A)
$$

熵与条件熵的差称为互信息.

熵与条件熵的差称为互信息
决策树中的信息增益等价于训练数据集中的类与特征的互信息.

## 算法

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