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Restrict types accepted by frule muladd and make tests more comprehensive #728

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merged 2 commits into from
Jul 11, 2023
Merged

Restrict types accepted by frule muladd and make tests more comprehensive #728

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8b9cd00
restrict muladd frule and add more tests
oxinabox Jul 11, 2023
aa2fd65
bump version
oxinabox Jul 11, 2023
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2 changes: 1 addition & 1 deletion Project.toml
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
name = "ChainRules"
uuid = "082447d4-558c-5d27-93f4-14fc19e9eca2"
version = "1.52.0"
version = "1.52.1"

[deps]
Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"
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8 changes: 7 additions & 1 deletion src/rulesets/Base/arraymath.jl
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Expand Up @@ -210,7 +210,13 @@ end # VERSION
##### `muladd`
#####

function frule((_, ΔA, ΔB, Δz), ::typeof(muladd), A, B, z)
function frule(
(_, ΔA, ΔB, Δz),
::typeof(muladd),
A::AbstractVecOrMat{<:CommutativeMulNumber},
B::AbstractVecOrMat{<:CommutativeMulNumber},
z::Union{CommutativeMulNumber, AbstractVecOrMat{<:CommutativeMulNumber}}
)
Ω = muladd(A, B, z)
return Ω, ΔA * B .+ A * ΔB .+ Δz
end
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11 changes: 8 additions & 3 deletions test/rulesets/Base/arraymath.jl
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Expand Up @@ -85,44 +85,49 @@

@testset "muladd: $T" for T in (Float64, ComplexF64)
@testset "add $(typeof(z))" for z in [rand(), rand(T, 3), rand(T, 3, 3), false]
@testset "forward mode" begin
@gpu test_frule(muladd, rand(T, 3, 5), rand(T, 5, 3), z)
end
@testset "matrix * matrix" begin
A = rand(T, 3, 3)
B = rand(T, 3, 3)
@gpu test_rrule(muladd, A, B, z)
@gpu test_rrule(muladd, A', B, z)
@gpu test_rrule(muladd, A , B', z)
@gpu test_frule(muladd, A, B, z)
@gpu test_frule(muladd, A', B, z)
@gpu test_frule(muladd, A , B', z)

C = rand(T, 3, 5)
D = rand(T, 5, 3)
@gpu test_rrule(muladd, C, D, z)
@gpu test_frule(muladd, C, D, z)
end
if ndims(z) <= 1
@testset "matrix * vector" begin
A, B = rand(T, 3, 3), rand(T, 3)
test_rrule(muladd, A, B, z)
test_rrule(muladd, A, B ⊢ rand(T, 3,1), z)
test_frule(muladd, A, B, z)
end
@testset "adjoint * matrix" begin
At, B = rand(T, 3)', rand(T, 3, 3)
test_rrule(muladd, At, B, z')
test_rrule(muladd, At ⊢ rand(T,1,3), B, z')
test_frule(muladd, At, B, z')
end
end
if ndims(z) == 0
@testset "adjoint * vector" begin # like dot
A, B = rand(T, 3)', rand(T, 3)
test_rrule(muladd, A, B, z)
test_rrule(muladd, A ⊢ rand(T,1,3), B, z')
test_frule(muladd, A, B, z)
end
end
if ndims(z) == 2 # other dims lead to e.g. muladd(ones(4), ones(1,4), 1)
@testset "vector * adjoint" begin # outer product
A, B = rand(T, 3), rand(T, 3)'
test_rrule(muladd, A, B, z)
test_rrule(muladd, A, B ⊢ rand(T,1,3), z)
test_frule(muladd, A, B, z)
end
end
end
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