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Hands-On Automated Machine Learning
book

Hands-On Automated Machine Learning

by Sibanjan Das, Umit Mert Cakmak
April 2018
Beginner to intermediate content levelBeginner to intermediate
282 pages
6h 52m
English
Packt Publishing
Content preview from Hands-On Automated Machine Learning

The sigmoid function

The sigmoid function is defined as: 

Here, x is the value of the weighted sum of the input values. We have seen this function in logistic regression. When x is below zero it drops off, and anything above zero it approximates towards one. Unlike a step function, it is a non-linear activation function. It is mostly used in output layers in a neural network, when we work on classification tasks trying to predict probabilities. The following figure illustrates the sigmoid function:

The next activation function we discuss is ...

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Publisher Resources

ISBN: 9781788629898Supplemental Content