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use ProjectTo in rules for constructors of triangular matrixes #607

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use ProjectTo in rules for constructors of triangular matrixes #607

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6 changes: 4 additions & 2 deletions src/rulesets/LinearAlgebra/structured.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -208,15 +208,17 @@ end
#####

function rrule(::Type{<:UpperTriangular}, A::AbstractMatrix)
project = ProjectTo(A)
function UpperTriangular_pullback(ȳ)
return (NoTangent(), Matrix(ȳ))
return (NoTangent(), project(ȳ))
end
return UpperTriangular(A), UpperTriangular_pullback
end

function rrule(::Type{<:LowerTriangular}, A::AbstractMatrix)
project = ProjectTo(A)
function LowerTriangular_pullback(ȳ)
return (NoTangent(), Matrix(ȳ))
return (NoTangent(), project(ȳ))
end
return LowerTriangular(A), LowerTriangular_pullback
end
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