sigmoid python numpy

# Import matplotlib, numpy and math 
import matplotlib.pyplot as plt 
import numpy as np 
import math 
  
x = np.linspace(-10, 10, 100) 
z = 1/(1 + np.exp(-x)) 
  
plt.plot(x, z) 
plt.xlabel("x") 
plt.ylabel("Sigmoid(X)") 
  
plt.show()