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# 解释下随机森林? | ||
- 随机森林=bagging+决策树 | ||
- 随机:特征选择随机+数据采样随机 | ||
- 特征随机是在决策树每个结点上选择的时候随机,并不是在每棵树创建的时候随机 | ||
- 每个结点上对特征选择都是从全量特征中进行采样对,不会剔除已利用对 | ||
- 数据采样,是有放回的采样 | ||
- 1个样本**未被选到**的概率为p = (1 - 1/N)^N = 1/e,即为OOB | ||
- 森林:多决策树组合 | ||
- 可分类可回归,回归是对输出值进行简单平均,分类是对输出值进行简单投票 | ||
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# 解释下随机森林节点的分裂策略? | ||
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# 随机森林的损失函数是什么? | ||
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# 为了防止随机森林过拟合可以怎么做? | ||
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# 是否用过随机森林,怎么用的? |