April 2017
Intermediate to advanced
318 pages
7h 40m
English
Content preview from Deep Learning with Keras
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Activation function — sigmoid
The sigmoid function is defined as follows:
As represented in the following graph, it has small output changes in (0, 1) when the input varies in 
. Mathematically, the function is continuous. A typical sigmoid function is represented in the following graph:
A neuron can use the sigmoid for computing the nonlinear function . Note that, if is very large and positive, then , so , while if is very large and negative ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.