1class Sigmoid:
2 def __call__(self, z):
3 """
4 Compute the sigmoid of z
5 Arguments:
6 z -- scalar or numpy array of any size.
7 Return:
8 sigmoid(z)
9 """
10 sigmoid = 1/np.exp(-z)
11 return sigmoid
12
13 def prime(self, z): # Questions need some help --- Thanks!
14 """
15 Compute the derivative of sigmoid of z
16 Arguments:
17 z -- scalar or numpy array of any size.
18 Return:
19 Sigmoid prime
20 """
21 ###return sigmoid * (1 - sigmoid)