I wrote code to show both evolution and backpropagation based training of Fast Transform (aka. Fixed Filter Bank) neural networks:
Evolution:
https://s6regen.github.io/Fast-Transform-Neural-Network-Evolution/
Backpropagation:
https://s6regen.github.io/Fast-Transform-Neural-Network-Backpropagation/
The code is in JavaScript and you can online edit it, if you want to experiment a bit.