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It's written by me, and not yet open sourced ;)

And it's very simple. Just have a look at Neuromancer.FastMath. U just wrapped similar things in an elegant API ;)

Oh, I had assumed it was out in the public like PyTorch. Fast math is fun!

It seems that the word "and" is ambiguous. Fixed ;)

just found a good math library Commons Math3

it has a much better approximation of exp than the look-up-table without memory version, and is still 2x faster than StrictMath