Found in 1 comment on Hacker News
PaulHoule · 2021-10-12 · Original thread
This book is a little old but you should learn whatever math it takes to understand it

https://www.amazon.com/Networks-Recognition-Advanced-Econome...

Another oldie-but-goodie is

https://www.amazon.com/Neural-Networks-Lecture-Computer-Scie...

which tells the secret of when to stop when you're doing "early stopping", something I've seen many modern deep learners fail to get right.

Off the top of my head I would say the fundamental math about deep networks is not really new. Most of the work in that field is pretty ad-hoc and not a lot is proven; probably people that are proving things are using difficult graduate-level math but you don't need to go there.

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