July 2017
Beginner to intermediate
486 pages
13h 49m
English
Content preview from Python Natural Language Processing
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Sigmoid
The sigmoid function is very easy to understand in terms of its mathematical concepts. Its mathematical formula is shown in Figure 9.33:
Figure 9.33: Sigmoid function equation (Image credit: https://cdn-images-1.medium.com/max/800/1*QHPXkxGmIyxn7mH4BtRJXQ.png)
As you can see in Figure 9.33, the sigmoid function will take the given equation, take a number, and squash this number in the range of zero and one. It produces an s-shaped curve.
This function is the first one to be used in ANN as an activation function because it could be interpreted as the firing rate of neuron--zero means no firing and one is fully saturated firing. When ...
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