# Sigmoid prime Python

class Sigmoid: def __call__(self, z): """ Compute the sigmoid of z Arguments: z -- scalar or numpy array of any size. Return: sigmoid(z) """ sigmoid = 1/np.exp(-z) return sigmoid def prime(self, z): # Questions need some help --- Thanks! """ Compute the derivative of sigmoid of z Arguments: z -- scalar or numpy array of any size. Return: Sigmoid prime """ ###return sigmoid * (1 - sigmoid)

**Here is what the above code is Doing:**

1. We create a class called Sigmoid.

2. We define a function __call__ which takes an argument z.

3. We then use the sigmoid function to compute the sigmoid of z.

4. We define a function prime which takes an argument z.

5. We then compute the derivative of the sigmoid function evaluated at z.