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1.sigmoid

函数:f(z) = 1 / (1 + exp( − z)) 导数:f(z)' = f(z)(1 − f(z)) sigmoid

2.tanh

函数:f(z) = tanh(z) 导数:f(z)' = 1 − (f(z))^2 tanh

3.relu

f(x)=max(0,x) relu

4.softmax

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