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Pullback function #199

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ConnorMallon opened this issue Apr 23, 2022 · 2 comments
Open

Pullback function #199

ConnorMallon opened this issue Apr 23, 2022 · 2 comments

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@ConnorMallon
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ConnorMallon commented Apr 23, 2022 •
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Does ReverseDiff.jl have a something similar to y,pb=Zygote.pullback(f,x) which builds a pullback function pb that can be called on an output tangent Δy and when called internally does the vector-jacobian product without assembling the jacobian ?
@mohamed82008
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You can do it by hacking a little around the internals of ReverseDiff but it's not easy to do. Look at the ReverseDiff code in AbstractDifferentiation.jl for a hint. I am currently refactoring AbstractDifferentiation though so I don't want to recommend using it for now.

@mohamed82008
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I don't want to recommend using AbstractDifferentiation now but you can adapt the implementation there for your purposes.

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@mohamed82008 @ConnorMallon