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机器学习5.5代码问题 #3

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wuguohaoECE opened this issue Feb 9, 2020 · 0 comments

wuguohaoECE commented Feb 9, 2020

您好，想问问BpNeuralNetwork.py里卖弄104行的计算公式da_last = -(y_ / a_last - (1 - y_) / (1 - a_last))是在算什么呢，因为我看了后面代码里面sigmoid反向传播有用到，应该是对应书本公式5.10中y真实值和预测值的差

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