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transpose specialization for DiagonalTensorMap #335

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Merged
lkdvos merged 3 commits into from
Jan 2, 2026
Merged

transpose specialization for DiagonalTensorMap #335

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06f8c73
add `transpose` specialization for `DiagonalTensorMap`
lkdvos Jan 1, 2026
fe5fca1
add test
lkdvos Jan 1, 2026
0f35fa2
slight test fixes
lkdvos Jan 1, 2026
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24 changes: 23 additions & 1 deletion src/tensors/diagonal.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -211,7 +211,29 @@ function permute(
end
return d′
else
throw(ArgumentError("invalid permutation $((p₁, p₂)) for tensor in space $(space(d))"))
throw(ArgumentError(lazy"invalid permutation $((p₁, p₂)) for tensor in space $(space(d))"))
end
end

function LinearAlgebra.transpose(
d::DiagonalTensorMap, (p₁, p₂)::Index2Tuple{1, 1}; copy::Bool = false
)
if p₁ === (1,) && p₂ === (2,)
return copy ? Base.copy(d) : d
elseif p₁ === (2,) && p₂ === (1,) # transpose
if has_shared_permute(d, (p₁, p₂)) # tranpose for bosonic sectors
return DiagonalTensorMap(copy ? Base.copy(d.data) : d.data, dual(d.domain))
end
d′ = typeof(d)(undef, dual(d.domain))
for (c, b) in blocks(d)
f = only(fusiontrees(codomain(d), c))
((f′, _), coeff) = only(transpose(f, f, p₁, p₂))
c′ = f′.coupled
scale!(block(d′, c′), b, coeff)
end
return d′
else
throw(ArgumentError(lazy"invalid transposition $((p₁, p₂)) for tensor in space $(space(d))"))
end
end

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23 changes: 15 additions & 8 deletions test/tensors/diagonal.jl
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Expand Up @@ -119,19 +119,26 @@ diagspacelist = (
if BraidingStyle(I) isa SymmetricBraiding
@timedtestset "Permutations" begin
t = DiagonalTensorMap(randn(ComplexF64, reduceddim(V)), V)
t_tm = convert(TensorMap, t)

# preserving diagonal
t1 = @constinferred permute(t, $(((2,), (1,))))
if BraidingStyle(sectortype(V)) isa Bosonic
@test t1 ≈ transpose(t)
end
@test convert(TensorMap, t1) == permute(convert(TensorMap, t), (((2,), (1,))))
@test t1 isa DiagonalTensorMap
@test convert(TensorMap, t1) == permute(t_tm, (((2,), (1,))))
t1′ = @constinferred transpose(t)
@test t1′ isa DiagonalTensorMap
@test convert(TensorMap, t1′) == transpose(t_tm)
BraidingStyle(I) isa Bosonic && @test t1 ≈ t1′

# not preserving diagonal
t2 = @constinferred permute(t, $(((1, 2), ())))
@test convert(TensorMap, t2) == permute(convert(TensorMap, t), (((1, 2), ())))
@test convert(TensorMap, t2) == permute(t_tm, (((1, 2), ())))
t3 = @constinferred permute(t, $(((2, 1), ())))
@test convert(TensorMap, t3) == permute(convert(TensorMap, t), (((2, 1), ())))
@test convert(TensorMap, t3) == permute(t_tm, (((2, 1), ())))
t4 = @constinferred permute(t, $(((), (1, 2))))
@test convert(TensorMap, t4) == permute(convert(TensorMap, t), (((), (1, 2))))
@test convert(TensorMap, t4) == permute(t_tm, (((), (1, 2))))
t5 = @constinferred permute(t, $(((), (2, 1))))
@test convert(TensorMap, t5) == permute(convert(TensorMap, t), (((), (2, 1))))
@test convert(TensorMap, t5) == permute(t_tm, (((), (2, 1))))
end
end
@timedtestset "Trace, Multiplication and inverse" begin
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