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I made an explicit double-reverse pass (no code!), it was 80x faster in my head!

"I've got an ipod -- In My Mind"

https://theonion.com/i-have-an-ipod-in-my-mind-1819584018/

code here, it's just not interesting to look at:

https://news.ycombinator.com/item?id=47220542

tradeoff worth naming: you avoid the autodiff graph overhead (hence the speedup), but any architecture change means rewriting every gradient by hand. fine for a pedagogical project, but that's exactly why autodiff exists.

Can you share a link?

https://www.ideone.com/VAz4Nn

Doesn't run inside IDEone due to the external download link, but you can copy&paste the code over