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[ITensorMPS] Added option for MPO-MPS zipup #1536

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[ITensorMPS] Added option for MPO-MPS zipup #1536

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5a257c8
Added option for MPO-MPS zipup.
corbett5 Sep 27, 2024
ec126ba
Removed ResultType.
corbett5 Oct 8, 2024
7040462
Added truncate_kwargs parameter
corbett5 Oct 9, 2024
74f452a
Changed truncate_kwargs default value.
corbett5 Oct 10, 2024
07f7534
Fixed mistake with truncate kwargs.
corbett5 Oct 10, 2024
a332ac9
Updated docs and added tests.
corbett5 Oct 15, 2024
e2979a1
Format changes.
corbett5 Oct 17, 2024
54387b9
Manual format changes.
corbett5 Oct 17, 2024
08c6cd6
Combined documentation and added reference.
corbett5 Oct 23, 2024
f1f6cc2
Fixed typo in docs.
corbett5 Oct 24, 2024
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9 changes: 5 additions & 4 deletions src/lib/ITensorMPS/src/mpo.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -822,10 +822,11 @@ end
function ITensors.contract(
::Algorithm"zipup",
A::MPO,
B::MPO;
B::AbstractMPS;
cutoff=1e-14,
maxdim=maxlinkdim(A) * maxlinkdim(B),
mindim=1,
truncate_kwargs=(;),
kwargs...,
)
if hassameinds(siteinds, A, B)
Expand All @@ -837,13 +838,13 @@ function ITensors.contract(
N != length(B) &&
throw(DimensionMismatch("lengths of MPOs A ($N) and B ($(length(B))) do not match"))
# Special case for a single site
N == 1 && return MPO([A[1] * B[1]])
N == 1 && return typeof(B)([A[1] * B[1]])
A = orthogonalize(A, 1)
B = orthogonalize(B, 1)
A = sim(linkinds, A)
sA = siteinds(uniqueinds, A, B)
sB = siteinds(uniqueinds, B, A)
C = MPO(N)
C = typeof(B)(N)
lCᵢ = Index[]
R = ITensor(true)
for i in 1:(N - 2)
Expand Down Expand Up @@ -874,7 +875,7 @@ function ITensors.contract(
mindim,
kwargs...,
)
truncate!(C; kwargs...)
truncate!(C, truncate_kwargs...)
return C
end

Expand Down
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