21 lines
376 B
Python
21 lines
376 B
Python
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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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Created on Tue Apr 30 19:58:26 2019
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@author: francois
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"""
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import math
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def sigmoid(x):
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"""
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Sigmoid function evaluated at x
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"""
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return 1/(1 + math.exp(-x))
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def sigmoid_derivative(x):
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"""
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Derivative of the sigmoid function evaluated at x
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"""
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return math.exp(x)/(math.pow((math.exp(x) + 1),2))
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