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练习4中加入正则化的反向传播函数 #101

@royalknight3341

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@royalknight3341

隐藏层的误差项的计算代码有误,将
d2t = np.multiply((d3t, theta2), sigmoid_gradient(z2t))
改为
d2t = np.multiply((theta2.T * d3t.T).T, sigmoid_gradient(z2t))

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