handle permutedims rrule with ZeroTangent #683
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mcabbott
reviewed
Oct 24, 2022
| function rrule(::typeof(permutedims), x::AbstractVector) | ||
| project = ProjectTo(x) | ||
| permutedims_pullback_1(dy) = (NoTangent(), project(permutedims(unthunk(dy)))) | ||
| permutedims_pullback_1(::ZeroTangent) = (NoTangent(), ZeroTangent()) |
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IDK why there are several Zeros, but perhaps if doing this it may as well accept all of them:
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| permutedims_pullback_1(::ZeroTangent) = (NoTangent(), ZeroTangent()) | |
| permutedims_pullback_1(z::AbstractZero) = (NoTangent(), z) |
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IDK either, but I follow how CR.jl previously do.
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Instances of the wider pattern, which I didn't write, include:
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Oh, then should I update this PR, or just leave as it is?
mcabbott
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Oct 25, 2022
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