[LPisGood]

I did this in highschool from some online textbook in plain Java. I recall implementing matrix multiplication myself being the hardest part.

I made a UI that showed how the weights and biases changed throughout the training iterations.

[aDyslecticCrow]

I had a whole course just about how computers do maths. Matrix multiplication, linear fit, finding eigenvectors, multiplication and division, square root, solving linear systems, numerically calculating differential equations, spline interpolation, FEM analysis.

"Computers are good at maths" is normally a pretty obvious statement... but many things we take for granted from analytical mathematics, is quite difficult to actually implement in a computer. So there is a mountain of clever algorithms hiding behind some of the seemingly most obvious library operations.

One of the best courses I've ever had.

[e-master]

Would you mind sharing which course it was? Is it available online by any chance?

[aDyslecticCrow]

Unfortunately it was a course at my university, and in Swedish. But it wouldn't surprise me if there are similar courses online.