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view 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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"""
sigmoid function: 1/(1 + e^-z)
"""

import math

def sigmoid(z):
    return 1./(1. + math.exp(-z))