Python Deep Learning - Second Edition

A coding example of convolution operation

We've now described how convolutional layers work, but we'll gain better intuition with a visual example. Let's implement a convolution operation by applying a couple of filters across an image. For the sake of clarity, we'll implement the sliding of the filters across the image manually and we won't use any DL libraries. Let's start.

1. First, we'll import numpy, as shown in the following example:

import numpy as np  

2. Then, we'll define the function conv, which applies the convolution across the image. conv takes two parameters: image for the image itself and filter, for the filter:
   • First, we'll compute the output image size, which depends on the input image and filter sizes. We'll use it to instantiate ...