Human: sigmoid activation function. Assistant: 
Here is a Python function to sigmoid activation

import numpy as np

def sigmoid(x):
    """
    Sigmoid activation function.
    """
    return 1 / (1 + np.exp(-x))

# Enter the number
x = 10

# Calling the function
print((sigmoid(x)))

#Example Output
# 0.9999546021312976

#Remember to inspect code for bugs.