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annotate tvii/sigmoid.py @ 16:b95fe82ac9ce

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author Jeff Hammel <k0scist@gmail.com>
date Sun, 03 Sep 2017 13:17:33 -0700
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children bf8bd42f8cd7
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b95fe82ac9ce more notes to self
Jeff Hammel <k0scist@gmail.com>
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1 """
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Jeff Hammel <k0scist@gmail.com>
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2 sigmoid function: 1/(1 + e^-z)
b95fe82ac9ce more notes to self
Jeff Hammel <k0scist@gmail.com>
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3 """
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Jeff Hammel <k0scist@gmail.com>
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4
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Jeff Hammel <k0scist@gmail.com>
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5 import math
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Jeff Hammel <k0scist@gmail.com>
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6
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Jeff Hammel <k0scist@gmail.com>
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7 def sigmoid(z):
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Jeff Hammel <k0scist@gmail.com>
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8 return 1./(1. + math.exp(-z))