It looks like it's doing only addition and multiplication. The rest is left as an exercise to the reader. Here's a much better introduction, that links you to

It looks like it's doing only addition and multiplication. The rest is left as an exercise to the reader. Here's a much better introduction, that links you to an industrial-level autodiff library [1]. [1] https://sidsite.com/posts/autodiff/ https://sidsite.com/posts/autodiff/