Show HN: Tiny Toy Network – a neural net to practice backpropagation

I’ve recently finished Math for Deep Learning and really enjoyed computing back propagation by hand. However, it’s one of those things where if you stop doing it for six months, you’ll just forget how (at least for me!). I put together this tiny neural network based on the example from Kneusel so I can practice my math regularly. Welcome any feedback / bug spotting, or similar tools to help with practicing these skills.