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Add a rule and tests for TensorMap(d::DiagonalTensorMap) #553

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Merged
lkdvos merged 1 commit into from
Sep 24, 2026
Merged

Add a rule and tests for TensorMap(d::DiagonalTensorMap) #553

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7 changes: 7 additions & 0 deletions ext/TensorKitChainRulesCoreExt/constructors.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,13 @@ function ChainRulesCore.rrule(::Type{DiagonalTensorMap}, t::AbstractTensorMap)
return d, DiagonalTensorMap_pullback
end

function ChainRulesCore.rrule(::Type{TensorMap}, d::DiagonalTensorMap)
t = TensorMap(d)
P = ProjectTo(d)
TensorMap_pullback(Δt) = NoTangent(), P(unthunk(Δt))
return t, TensorMap_pullback
end

function ChainRulesCore.rrule(::typeof(Base.getproperty), t::TensorMap, prop::Symbol)
if prop === :data
function getdata_pullback(Δdata)
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3 changes: 3 additions & 0 deletions test/chainrules/linalg.jl
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Expand Up @@ -89,6 +89,9 @@ for V in spacelist

test_rrule(DiagonalTensorMap, rand!(T1))
test_rrule(DiagonalTensorMap, randn!(T))

test_rrule(TensorMap, D1)
test_rrule(TensorMap, D)
end
end

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