Comments (5)
PseudoProgrammer
commented on May 20, 2024
重新review了下代码，这种理解对吗？
计算impurity是全量样本，但全量样本分为了三部分计算再求和：1、fitness0是基于missing_value的样本算出。2、fitness1是基于fea_value<split_value的样本算出。3、fitness2是基于fea_value>split_value算出
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qiyiping
commented on May 20, 2024
你好，是的
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PseudoProgrammer
commented on May 20, 2024
好的，多谢！然后wikipead里基尼不纯度的计算方式是p(1-p)求和，代码里是p的方差。我的疑问是在选择特征分裂点时，是不是用的方差代替基尼不纯度
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PseudoProgrammer
commented on May 20, 2024
这两个指标是不一样的把？
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qiyiping
commented on May 20, 2024
你好，每一颗树都是回归树（拟合梯度）。
具体的请参考：Friedman, J. H. “Greedy Function Approximation: A Gradient Boosting Machine.” (February 1999)
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