1. sigmoid
函数:f(z) = 1 / (1 + exp( − z))
导数:f(z)' = f(z)(1 − f(z))
2.tanh
函数:f(z)
= tanh(z)
导数:f(z)'
= 1 − (f(z))2
1. sigmoid
函数:f(z) = 1 / (1 + exp( − z))
导数:f(z)' = f(z)(1 − f(z))
2.tanh
函数:f(z)
= tanh(z)
导数:f(z)'
= 1 − (f(z))2