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Pullbacks for Diagonal inputs #156

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Pullbacks for Diagonal inputs #156

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b827f03
naively specialize diagonal pullback
lkdvos Jan 16, 2026
de0c3b6
add eig diagonal pullback
lkdvos Jan 16, 2026
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20 changes: 20 additions & 0 deletions src/pullbacks/eig.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,16 @@ function eig_pullback!(
end
return ΔA
end
function eig_pullback!(
ΔA::Diagonal, A, DV, ΔDV, ind = Colon();
degeneracy_atol::Real = default_pullback_rank_atol(DV[1]),
gauge_atol::Real = default_pullback_gauge_atol(ΔDV[2])
)
ΔA_full = zero!(similar(ΔA, size(ΔA)))
ΔA_full = eig_pullback!(ΔA_full, A, DV, ΔDV, ind; degeneracy_atol, gauge_atol)
diagview(ΔA) .+= diagview(ΔA_full)
return ΔA
end

"""
eig_trunc_pullback!(
Expand Down Expand Up @@ -151,6 +161,16 @@ function eig_trunc_pullback!(
end
return ΔA
end
function eig_trunc_pullback!(
ΔA::Diagonal, A, DV, ΔDV;
degeneracy_atol::Real = default_pullback_rank_atol(DV[1]),
gauge_atol::Real = default_pullback_gauge_atol(ΔDV[2])
)
ΔA_full = zero!(similar(ΔA, size(ΔA)))
ΔA_full = eig_trunc_pullback!(ΔA_full, A, DV, ΔDV; degeneracy_atol, gauge_atol)
diagview(ΔA) .+= diagview(ΔA_full)
return ΔA
end

"""
eig_vals_pullback!(
Expand Down
20 changes: 20 additions & 0 deletions src/pullbacks/eigh.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -68,6 +68,16 @@ function eigh_pullback!(
end
return ΔA
end
function eigh_pullback!(
ΔA::Diagonal, A, DV, ΔDV, ind = Colon();
degeneracy_atol::Real = default_pullback_rank_atol(DV[1]),
gauge_atol::Real = default_pullback_gauge_atol(ΔDV[2])
)
ΔA_full = zero!(similar(ΔA, size(ΔA)))
ΔA_full = eigh_pullback!(ΔA_full, A, DV, ΔDV, ind; degeneracy_atol, gauge_atol)
diagview(ΔA) .+= diagview(ΔA_full)
return ΔA
end

"""
eigh_trunc_pullback!(
Expand Down Expand Up @@ -141,6 +151,16 @@ function eigh_trunc_pullback!(
end
return ΔA
end
function eigh_trunc_pullback!(
ΔA::AbstractMatrix, A, DV, ΔDV;
degeneracy_atol::Real = default_pullback_rank_atol(DV[1]),
gauge_atol::Real = default_pullback_gauge_atol(ΔDV[2])
)
ΔA_full = zero!(similar(ΔA, size(ΔA)))
ΔA_full = eigh_trunc_pullback!(ΔA_full, A, DV, ΔDV; degeneracy_atol, gauge_atol)
diagview(ΔA) .+= diagview(ΔA_full)
return ΔA
end

"""
eigh_vals_pullback!(
Expand Down
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