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getindex for CuArray to fix repeated indices error #1131

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getindex for CuArray to fix repeated indices error #1131

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5d58b06
getindex for CuArray
jgreener64 Dec 8, 2021
448ba91
Check for unique indices
jgreener64 Jan 5, 2022
fd5596a
Move to CUDA requires block
jgreener64 Jan 5, 2022
c951b0a
Broadcast on CPU
jgreener64 Feb 20, 2022
67069cb
Skip uniqueness check
jgreener64 Feb 22, 2022
167d500
update for changes on master
jgreener64 Aug 3, 2022
8e06259
test repeated indexing
jgreener64 Aug 3, 2022
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7 changes: 7 additions & 0 deletions src/lib/broadcast.jl
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Expand Up @@ -286,3 +286,10 @@ using GPUArraysCore # replaces @require CUDA block, weird indenting to preserve

pull_block_vert(sz, Δ::AbstractGPUArray, A::Number) = @allowscalar Δ[sz]

∇getindex(x::T, inds::Tuple{AbstractArray{<:Integer}}) where {T <: AbstractGPUArray} = dy -> begin
inds1_cpu = Array(inds[1])
dx = zeros(eltype(dy), length(x))
dxv = view(dx, inds1_cpu)
dxv .= accum.(dxv, _droplike(Array(dy), dxv))
return _project(x, T(dx)), nothing
end
6 changes: 6 additions & 0 deletions test/cuda.jl
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Expand Up @@ -140,3 +140,9 @@ end
@test_skip gradient((x,y) -> sum(vcat(x,y)), 1f0, r, 2f0, r)[2] isa CUDA.CuArray{Float32}
end

@testset "repeated indexing" begin
f(a) = sum(view(a, [1, 1, 2]))
a = CUDA.CuArray([1.0f0, 1.0f0, 1.0f0])
@test f(a) == 3.0f0
@test Array(gradient(f, a)[1]) == [2.0f0, 1.0f0, 0.0f0]
end