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In [1]: import math
import math
In [2]: def sigmoid(x): return 1 / (1 + math.exp(x*(-1)))
def sigmoid(x): return 1 / (1 + math.exp(x*(-1)))
In [30]: def derivative_of_sigmoid(x): return sigmoid(x) * (1 - sigmoid(x))
def derivative_of_sigmoid(x): return sigmoid(x) * (1 - sigmoid(x))