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annotate tvii/sigmoid.py @ 17:bf8bd42f8cd7

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[sigmoid] use numpy + add docstring
author Jeff Hammel <k0scist@gmail.com>
date Sun, 03 Sep 2017 16:38:43 -0700
parents b95fe82ac9ce
children cd43ce453358
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1 """
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2 sigmoid function: 1/(1 + e^-z)
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3 """
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5 import numpy as np
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8 def sigmoid(z):
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9 """https://en.wikipedia.org/wiki/Sigmoid_function"""
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10 return 1./(1. + np.exp(-z))