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更新决策树流程介绍图
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* \\(H = -\sum_{i=0}^np(x_i)\log_2p(x_i)\\) 表示香农熵,用于计算信息熵
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* 基尼不纯度(Gini impurity) [本书不做过多的介绍]
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* 简单来说:就是从一个数据集中随机选取子项,度量其被错误分类到其他分组里的概率。
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* 流程介绍图
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* 
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