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Sm1les avatar Sm1les commented on May 4, 2024

同学你好，书上说的是“将分类阈值依次设为每个样例的预测值”，并不是“按顺序逐个把样本作为正例”。

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zhanghexie avatar zhanghexie commented on May 4, 2024

不是的，书上说的是“我们根据机器学习的预测结果对样本进行排序，按此顺序逐个把样本作为正例预测，每次计算……”（西瓜书33页倒数第一段）

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Sm1les avatar Sm1les commented on May 4, 2024

@zhanghexie 同学你好，33页那句话是不能严格扣字面意思的，那里我觉得是周老师进行一个简单的概述而已，不能作为画ROC曲线的标准规范，那句话要理解也应该理解为“按顺序逐个把样本的预测值作为分类阈值来判别正例”，也就是和34页的倒数第三段的倒数第四句话“将分类阈值依次设为每个样例的预测值”是同一个意思，因为画ROC曲线的标准规范就是34页的倒数第三段给出的，同时我们对公式2.21的解析也是严格基于这一段话的。

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zhanghexie avatar zhanghexie commented on May 4, 2024

@Sm1les 好的，知道了，多谢大佬指点。

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