Python Deep Learning - Second Edition

Stride and padding in convolutional layers

Until now, we assumed that sliding of the filter happens one pixel at a time, but that's not always the case. We can slide the filter multiple positions. This parameter of the convolutional layers is called stride. Usually, the stride is the same across all dimensions of the input. In the following diagram, we can see a convolutional layer with a stride of 2:

With stride 2, the filter is translated by two pixels at a time

By using a stride larger than 1, we reduce the size of the output slice. In the previous section, we introduced a simple formula for the output size, which included the sizes of ...