jstn.ch

Hi! I'm Justin, an undergraduate in London. I'm interested in using neural networks and making cool stuff.

Projects

neuralnet-from-scratch

Handwritten character recognition with the forward pass, backpropagation and optimisers written by hand in NumPy. 95% on MNIST; SGD, momentum and AdamW each match PyTorch. Draw a character and it runs in your browser.

2026 · NumPy, PyTorch · MNIST, EMNIST · Source