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Remove redundant sum() rules #1453

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Remove redundant sum() rules #1453

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4c470eb
Remove GPU sum() rule
ToucheSir Sep 1, 2023
33946f3
Try removing Fill sum rule too
ToucheSir Sep 5, 2023
a32f039
Remove bool rule too and correct test
ToucheSir Sep 6, 2023
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11 changes: 0 additions & 11 deletions src/lib/array.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -329,17 +329,6 @@ end
end

# Reductions
@adjoint function sum(xs::AbstractArray; dims = :)
if dims === (:)
sum(xs), Δ -> (Fill(Δ, size(xs)),)
else
sum(xs, dims = dims), Δ -> (similar(xs) .= Δ,)
end
end

@adjoint function sum(xs::AbstractArray{Bool}; dims = :)
sum(xs, dims = dims), Δ -> (nothing,)
end

function _pullback(cx::AContext, ::typeof(prod), f, xs::AbstractArray)
return _pullback(cx, (f, xs) -> prod(f.(xs)), f, xs)
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5 changes: 0 additions & 5 deletions src/lib/broadcast.jl
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Expand Up @@ -364,11 +364,6 @@ using GPUArraysCore # replaces @require CUDA block, weird indenting to preserve
@adjoint (::Type{T})(xs::Array) where {T <: AbstractGPUArray} =
T(xs), Δ -> (convert(Array, Δ), )

@adjoint function sum(xs::AbstractGPUArray; dims = :)
placeholder = similar(xs)
sum(xs, dims = dims), Δ -> (placeholder .= Δ,)
end

# Make sure sum(f, ::CuArray) uses broadcast through forward-mode defined above
# Not the ChainRules.rrule which will use the Zygote.Context and thus not be GPU compatible
function _pullback(cx::AContext, ::typeof(sum), f, xs::AbstractGPUArray)
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4 changes: 2 additions & 2 deletions test/lib/array.jl
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Expand Up @@ -50,8 +50,8 @@ end
@testset "dictionary comprehension" begin
d = Dict(1 => 5, 2 => 6)
g = gradient(d -> sum([v^2 for (_,v) in d]), d)[1]
@test g isa Dict{Int, Int}
@test g == Dict(1 => 10, 2 => 12)
@test g isa Dict{Int, Float64}
@test g == Dict(1 => 10.0, 2 => 12.0)


w = randn(5)
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