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Fix type inference failure in norm on structural matrix #816

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Fix type inference failure in norm on structural matrix #816

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Fix type inference failure in norm on structural matrix
oxinabox Dec 29, 2024
b8ac8b0
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oxinabox Dec 29, 2024
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10 changes: 8 additions & 2 deletions src/rulesets/LinearAlgebra/norm.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,10 @@ function rrule(::typeof(norm), x::AbstractArray{<:Number}, p::Real)
end,
# out-of-place versions
@thunk(if isempty(x) || p == 0
zero.(x) .* (zero(y) * zero(real(Δy)))
# Note: post-julia-1.11 the zero.(Diagonal(Float64[;])) .* 0.0)
# only infers down to Union(Diagonal{Float64}, Matrix{Float64})
# rather than Diagonal{Float64}, so we cast it back.
maybe_withsomezeros_rewrap(x, zero.(x) .* (zero(y) * zero(real(Δy))))
elseif p == 2
_norm2_back(x, y, Δy)
elseif p == 1
Expand Down Expand Up @@ -72,7 +75,10 @@ function rrule(::typeof(norm), x::AbstractArray{<:Number})
end
,
@thunk(if isempty(x)
zero.(x) .* (zero(y) * zero(real(Δy)))
# Note: post-julia-1.11 the zero.(Diagonal(Float64[;])) .* 0.0)
# only infers down to Union(Diagonal{Float64}, Matrix{Float64})
# rather than Diagonal{Float64}, so we cast it back.
maybe_withsomezeros_rewrap(x, zero.(x) .* (zero(y) * zero(real(Δy))))
else
_norm2_back(x, y, Δy)
end)
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2 changes: 2 additions & 0 deletions src/rulesets/LinearAlgebra/utils.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -58,7 +58,9 @@ for S in [
:UnitLowerTriangular,
]
@eval withsomezeros_rewrap(::$S, x) = $S(x)
@eval maybe_withsomezeros_rewrap(::$S, x) = $S(x)
end
maybe_withsomezeros_rewrap(::AbstractArray, x) = x

# Bidiagonal, Tridiagonal have more complicated storage.
# AdjOrTransUpperOrUnitUpperTriangular would need adjoint(parent(parent()))
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