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use ProjectTo in Array addition #578

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use ProjectTo in Array addition #578

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1484c8d
use ProjectTo in Array addition
oxinabox Jan 21, 2022
6d44bb2
Add tests (failing)
oxinabox Jan 24, 2022
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4 changes: 2 additions & 2 deletions src/rulesets/Base/arraymath.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -392,9 +392,9 @@ end

function rrule(::typeof(+), arrs::AbstractArray...)
y = +(arrs...)
arr_axs = map(axes, arrs)
projects = map(ProjectTo, arrs)
function add_pullback(dy)
return (NoTangent(), map(ax -> reshape(dy, ax), arr_axs)...)
return (NoTangent(), map(project->project(dy), projects)...)
end
return y, add_pullback
end
3 changes: 3 additions & 0 deletions test/rulesets/Base/arraymath.jl
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Expand Up @@ -185,5 +185,8 @@
@testset "addition" begin
test_rrule(+, randn(4, 4), randn(4, 4), randn(4, 4))
test_rrule(+, randn(3), randn(3,1), randn(3,1,1))
test_rrule(+, randn(3,3), Diagonal(randn(3)), randn(3,3,1))
test_rrule(+, randn(3,3), Diagonal(randn(3)), Symmetric(randn(3,3)))

end
end