import numpy as np
import matplotlib.pyplot as plt

def sigmoid(z):
    return 1 / (1 + np.exp(-z))

z = np.linspace(-10, 10, 200)

plt.plot(z, sigmoid(z))
plt.xlabel("z")
plt.ylabel("sigmoid(z)")
plt.title("The Sigmoid Function")
plt.grid()
plt.show()

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