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Fix Flux.flip by providing an adjoint for Base.reverse #515

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Merged
merged 3 commits into from
Feb 25, 2020
Merged

Fix Flux.flip by providing an adjoint for Base.reverse #515

merged 3 commits into from
Feb 25, 2020

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@tanhevg
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@tanhevg tanhevg commented Feb 14, 2020

The main motivation behind this PR is to address various issues concerning Flux.flip() (used mainly for bRNNs), e.g. FluxML/Flux.jl#962, FluxML/Flux.jl#990 and FluxML/model-zoo#179

@tanhevg tanhevg requested a review from MikeInnes February 14, 2020 12:29
@CarloLucibello
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Does it fix flip? Can we have a test for it?

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tanhevg commented Feb 14, 2020

@CarloLucibello

Does it fix flip? Can we have a test for it?

Yes it does. Tests would have to go in Flux, so this would be a separate PR. One of us could put one in once this is merged and tagged in a Zygote release. Adding PRs that rely on unreleased versions of dependencies is messy.

@tanhevg tanhevg changed the title Adjoint for Base.reverse Fix Flux.flip by providing an adjoint for Base.reverse Feb 14, 2020
@DhairyaLGandhi
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Having the PR up would be helpful, I think it's one of the tail end of fixes remaining to update the zoo as well

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@CarloLucibello

Does it fix flip? Can we have a test for it?

Yes it does. Tests would have to go in Flux, so this would be a separate PR. One of us could put one in once this is merged and tagged in a Zygote release. Adding PRs that rely on unreleased versions of dependencies is messy.

oh right, thought flip was a Base function

@tanhevg tanhevg removed the request for review from MikeInnes February 14, 2020 13:57
MikeInnes
MikeInnes reviewed Feb 17, 2020
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Looks good, thanks!

src/lib/array.jl Outdated
@adjoint function reverse(x::AbstractArray, args...; kwargs...)
_reverse(t) = reverse(t, args...; kwargs...)
_nothings(t) = map(_->nothing, keys(t))
_reverse(x), Δ->(_reverse(Δ), _nothings(args)..., _nothings(kwargs)...)
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You don't need to return adjoints for the kwargs here.

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Thanks, duly noted

@CarloLucibello
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this seems good to go

@DhairyaLGandhi
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bors r+

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bors bot commented Feb 25, 2020

Build succeeded

@bors bors bot merged commit 701135b into FluxML:master Feb 25, 2020
@CarloLucibello CarloLucibello mentioned this pull request Feb 25, 2020
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tanhevg commented Feb 26, 2020

Fix FluxML/Flux.jl#962

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@tanhevg @CarloLucibello @DhairyaLGandhi @MikeInnes