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Let muladd accept arrays #37065

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merged 7 commits into from
Oct 29, 2020
Merged

Let muladd accept arrays #37065

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805eae9
muladd for arrays
Aug 16, 2020
7d0d91a
docstring
Aug 25, 2020
749e953
treat adjoints etc, and add tests
Sep 27, 2020
fc0ca88
remember to save before committing
Sep 27, 2020
191f61d
always use eltype, and add one test
Oct 6, 2020
69a3546
use ndims(number)==0, and add array-of-array tests
Oct 6, 2020
6456bf5
better wording
Oct 9, 2020
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use ndims(number)==0, and add array-of-array tests
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Michael Abbott committed Oct 6, 2020
commit 69a3546a5253eb22819ac47df486581d537713d4
14 changes: 4 additions & 10 deletions stdlib/LinearAlgebra/src/matmul.jl
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Expand Up @@ -185,9 +185,8 @@ end
"""
muladd(A, y, z)

Combined multiply-add, `A*y .+ z`, for either matrix-matrix multiplication or
matrix-vector multiplication. The result is always the size of `A*y`, although
`z` may have fewer dimensions.
Combined multiply-add, `A*y .+ z`, for matrix-matrix or matrix-vector multiplication.
The result is always the size of `A*y`, but `z` may be smaller, or a scalar.
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!!! compat "Julia 1.6"
These methods require Julia 1.6 or later.
Expand Down Expand Up @@ -220,18 +219,13 @@ Base.muladd(x::AdjointAbsVec, A::AbstractMatrix, z) = muladd(A', x', z')'
Base.muladd(x::TransposeAbsVec, A::AbstractMatrix, z) = transpose(muladd(transpose(A), transpose(x), transpose(z)))

function Base.muladd(u::AbstractVector, v::AdjOrTransAbsVec, z)
if z isa AbstractArray
ndims(z) > 2 && throw(DimensionMismatch("cannot broadcast array to have fewer dimensions"))
end
ndims(z) > 2 && throw(DimensionMismatch("cannot broadcast array to have fewer dimensions"))
(u .* v) .+ z
end

function Base.muladd(u::AdjOrTransAbsVec, v::AbstractVector, z)
uv = _dot_nonrecursive(u, v)
if z isa AbstractArray
uv isa AbstractArray && ndims(uv) <= ndims(z) ||
throw(DimensionMismatch("cannot broadcast array to have fewer dimensions"))
end
ndims(z) > ndims(uv) && throw(DimensionMismatch("cannot broadcast array to have fewer dimensions"))
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uv .+ z
end

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9 changes: 9 additions & 0 deletions stdlib/LinearAlgebra/test/matmul.jl
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Expand Up @@ -323,6 +323,15 @@ end
@test muladd(u2', u2, 0) isa Number
@test muladd(v3', v3, im) == dot(v3,v3) + im
@test_throws DimensionMismatch muladd(v3', v3, [1])

vofm = [rand(1:9,2,2) for _ in 1:3]
Mofm = [rand(1:9,2,2) for _ in 1:3, _ in 1:3]

@test muladd(vofm', vofm, vofm[1]) == vofm' * vofm .+ vofm[1] # inner
@test muladd(vofm, vofm', Mofm) == vofm * vofm' .+ Mofm # outer
@test muladd(vofm', Mofm, vofm') == vofm' * Mofm .+ vofm' # bra-mat
@test muladd(Mofm, Mofm, vofm) == Mofm * Mofm .+ vofm # mat-mat
@test_broken muladd(Mofm, vofm, vofm) == Mofm * vofm .+ vofm # mat-vec
end

# issue #6450
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