### convolutional layer

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#image

A layer of a deep neural network in which a convolutional filter passes along an input matrix. For example, consider the following 3x3 convolutional filter:

![ A 3x3 convolutional layer](https://i.imgur.com/NfZCimp.png)

The following animation shows a convolutional layer consisting of 9 convolutional operations involving the 5x5 input matrix. Notice that each convolutional operation works on a different 3x3 slice of the input matrix. The resulting 3x3 matrix (on the right) consists of the results of the 9 convolutional operations:

![An animation of a convolutional filter moving across a convolutional layer](https://i.imgur.com/IFE6UGo.gif)