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implement: vectorized sigmoid, sigmoid_prime #11

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implement: vectorized sigmoid, sigmoid_prime #11

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4 changes: 2 additions & 2 deletions code/dlgo/nn/layers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@ def sigmoid_double(x):


def sigmoid(z):
return np.vectorize(sigmoid_double)(z)
return np.reciprocal(np.add(1.0, np.exp(-z)))
# end::sigmoid[]


Expand All @@ -20,7 +20,7 @@ def sigmoid_prime_double(x):


def sigmoid_prime(z):
return np.vectorize(sigmoid_prime_double)(z)
return np.multiply(sigmoid(z),np.subtract(1,sigmoid(z)))
# end::sigmoid_prime[]


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