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逻辑斯蒂回归中存在一处疑似bug #2

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@CindyHuang23

逻辑斯蒂预测函数中,经过sigmoid函数计算出来的结果,应该是大于0.5为类别1,其余为类别0。sigmoid函数值域恒大于0,所以我认为楼主这个地方存在笔误。

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