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Skip ADing propagation if the value being pulled back is a AbstractZero #202

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oxinabox opened this issue Jul 2, 2021 · 0 comments

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oxinabox commented Jul 2, 2021

Follow up from https://github.com/invenia/Nabla.jl/pull/189/files#r662148541
when going back along the tape
if ȳ isa AbstractZero we know x̄=ȳ since pullbacks are linear operators, so we can just skip that step

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