Issue 5

.github/workflows/CI.yml

@@ -11,6 +11,11 @@ concurrency:
   # Cancel intermediate builds: only if it is a pull request build.
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
+permissions:
+  actions: write
+  contents: read
+
 jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
@@ -19,7 +24,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.9'
+          - 'lts'
           - '1'
         os:
           - ubuntu-latest
@@ -33,7 +38,7 @@ jobs:
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: julia-actions/cache@v1
+      - uses: julia-actions/cache@v2
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
         continue-on-error: ${{ matrix.version == 'nightly' }}

Project.toml

@@ -4,13 +4,17 @@ authors = ["Ritter.Marc <[email protected]> and contributors"]
 version = "0.1.4"
 
 [deps]
+ITensorMPS = "0d1a4710-d33b-49a5-8f18-73bdf49b47e2"
 ITensors = "9136182c-28ba-11e9-034c-db9fb085ebd5"
+Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
 TensorCrossInterpolation = "b261b2ec-6378-4871-b32e-9173bb050604"
 
 [compat]
-ITensors = "0.3, 0.4, 0.5, 0.6"
+ITensorMPS = "0.3.2"
+ITensors = "0.7"
+Reexport = "1.2.2"
 TensorCrossInterpolation = "0.8, 0.9"
-julia = "1.6"
+julia = "1.10"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"

src/TCIITensorConversion.jl

@@ -2,8 +2,10 @@ module TCIITensorConversion
 
 import TensorCrossInterpolation as TCI
 using ITensors
+using Reexport: @reexport
+import ITensorMPS
+@reexport using ITensorMPS: MPS
 
-export MPS
 export evaluate_mps
 
 include("ttmpsconversion.jl")

src/mpsutil.jl

@@ -1,17 +1,17 @@
 @doc raw"""
     function evaluate_mps(
-        mps::Union{ITensors.MPS,ITensors.MPO},
-        indexspecs::Vararg{AbstractVector{<:Tuple{ITensors.Index,Int}}}
+        mps::Union{ITensorMPS.MPS,ITensorMPS.MPO},
+        indexspecs::Vararg{AbstractVector{<:Tuple{ITensorMPS.Index,Int}}}
     )
 
 Evaluates an MPS or MPO for a given set of index values.
 
-- `indexspec` is a list of tuples, where each tuple contains an `Itensors.Index` object specifying an index, and an `Int` corresponding to the value of the specified index.
+- `indexspec` is a list of tuples, where each tuple contains an `ITensorMPS.Index` object specifying an index, and an `Int` corresponding to the value of the specified index.
 
 If many evaluations are necessary, it may be advantageous to convert your MPS to a `TensorCrossInterpolation.TTCache` object first.
 """
 function evaluate_mps(
-    mps::Union{ITensors.MPS,ITensors.MPO},
+    mps::Union{ITensorMPS.MPS,ITensorMPS.MPO},
     indexspecs::Vararg{AbstractVector{<:Tuple{ITensors.Index,Int}}}
 )
     if isempty(indexspecs)
@@ -22,27 +22,27 @@ function evaluate_mps(
 
     V = ITensor(1.0)
     for j in eachindex(indexspecs[1])
-        states = prod(state(spec[j]...) for spec in indexspecs)
+        states = prod(ITensorMPS.state(spec[j]...) for spec in indexspecs)
         V *= mps[j] * states
     end
     return scalar(V)
 end
 @doc raw"""
     function evaluate_mps(
-        mps::Union{ITensors.MPS,ITensors.MPO},
-        indices::AbstractVector{<:ITensors.Index},
+        mps::Union{ITensorMPS.MPS,ITensorMPS.MPO},
+        indices::AbstractVector{<:ITensorMPS.Index},
         indexvalues::AbstractVector{Int}
     )
 
 Evaluates an MPS or MPO for a given set of index values.
 
-- `indices` is a list of `ITensors.Index` objects that specifies the order in which indices are given.
+- `indices` is a list of `ITensorMPS.Index` objects that specifies the order in which indices are given.
 - `indexvalues` is a list of integer values in the same order as `indices`.
 
 If many evaluations are necessary, it may be advantageous to convert your MPS to a `TensorCrossInterpolation.TTCache` object first.
 """
 function evaluate_mps(
-    mps::Union{ITensors.MPS,ITensors.MPO},
+    mps::Union{ITensorMPS.MPS,ITensorMPS.MPO},
     indices::AbstractVector{<:ITensors.Index},
     indexvalues::AbstractVector{Int}
 )

src/ttmpsconversion.jl

@@ -9,7 +9,7 @@ Convert a tensor train to an ITensor MPS
 
  If `siteindices` is left empty, a default set of indices will be used.
 """
-function ITensors.MPS(tt::TCI.TensorTrain{T}; sites=nothing)::MPS where {T}
+function ITensorMPS.MPS(tt::TCI.TensorTrain{T}; sites=nothing)::MPS where {T}
     N = length(tt)
     localdims = [size(t, 2) for t in tt]
 
@@ -30,11 +30,11 @@ function ITensors.MPS(tt::TCI.TensorTrain{T}; sites=nothing)::MPS where {T}
     return MPS(tensors_)
 end
 
-function ITensors.MPS(tci::TCI.AbstractTensorTrain{T}; sites=nothing)::MPS where {T}
+function ITensorMPS.MPS(tci::TCI.AbstractTensorTrain{T}; sites=nothing)::MPS where {T}
     return MPS(TCI.tensortrain(tci), sites=sites)
 end
 
-function ITensors.MPO(tt::TCI.TensorTrain{T}; sites=nothing)::MPO where {T}
+function ITensorMPS.MPO(tt::TCI.TensorTrain{T}; sites=nothing)::ITensorMPS.MPO where {T}
     N = length(tt)
     localdims = TCI.sitedims(tt)
 
@@ -57,22 +57,22 @@ function ITensors.MPO(tt::TCI.TensorTrain{T}; sites=nothing)::MPO where {T}
     tensors_[1] *= onehot(links[1] => 1)
     tensors_[end] *= onehot(links[end] => 1)
 
-    return MPO(tensors_)
+    return ITensorMPS.MPO(tensors_)
 end
 
-function ITensors.MPO(tci::TCI.AbstractTensorTrain{T}; sites=nothing)::MPO where {T}
-    return MPO(TCI.tensortrain(tci), sites=sites)
+function ITensorMPS.MPO(tci::TCI.AbstractTensorTrain{T}; sites=nothing)::ITensorMPS.MPO where {T}
+    return ITensorMPS.MPO(TCI.tensortrain(tci), sites=sites)
 end
 
 
 """
-    function TCI.TensorTrain(mps::ITensors.MPS)
+    function TCI.TensorTrain(mps::ITensorMPS.MPS)
 
-Converts an ITensor MPS object into a TensorTrain. Note that this only works if the MPS has a single leg per site! Otherwise, use [`TCI.TensorTrain(mps::ITensors.MPO)`](@ref).
+Converts an ITensor MPS object into a TensorTrain. Note that this only works if the MPS has a single leg per site! Otherwise, use [`TCI.TensorTrain(mps::ITensorMPS.MPO)`](@ref).
 """
-function TCI.TensorTrain(mps::ITensors.MPS)
-    links = linkinds(mps)
-    sites = siteinds(mps)
+function TCI.TensorTrain(mps::ITensorMPS.MPS)
+    links = ITensorMPS.linkinds(mps)
+    sites = ITensors.SiteTypes.siteinds(mps)
     Tfirst = zeros(ComplexF64, 1, dim(sites[1]), dim(links[1]))
     Tfirst[1, :, :] = Array(mps[1], sites[1], links[1])
     Tlast =  zeros(ComplexF64, dim(links[end]), dim(sites[end]), 1)
@@ -87,15 +87,15 @@ function TCI.TensorTrain(mps::ITensors.MPS)
 end
 
 """
-    function TCI.TensorTrain(mps::ITensors.MPO)
+    function TCI.TensorTrain(mps::ITensorMPS.MPO)
 
 Convertes an ITensor MPO object into a TensorTrain.
 """
-function TCI.TensorTrain{V, N}(mpo::ITensors.MPO; sites=nothing) where {N, V}
-    links = linkinds(mpo)
+function TCI.TensorTrain{V, N}(mpo::ITensorMPS.MPO; sites=nothing) where {N, V}
+    links = ITensorMPS.linkinds(mpo)
     if sites === nothing
-        sites = siteinds(mpo)
-    elseif !all(issetequal.(siteinds(mpo), sites))
+        sites = ITensors.SiteTypes.siteinds(mpo)
+    elseif !all(issetequal.(ITensors.SiteTypes.siteinds(mpo), sites))
         error("Site indices do not correspond to the site indices of the MPO.")
     end
 

test/runtests.jl

@@ -1,4 +1,6 @@
 using ITensors
+using ITensors.SiteTypes: siteinds
+using ITensorMPS
 import TensorCrossInterpolation as TCI
 using TCIITensorConversion
 using Test

test/test_ttmpsconversion.jl

@@ -2,13 +2,13 @@
 @testset "TCIITensorConversion.jl" begin
     @testset "TT to MPS conversion" begin
         tt = TCI.TensorTrain([rand(1, 4, 4), rand(4, 4, 2), rand(2, 4, 7), rand(7, 4, 1)])
-        mps = ITensors.MPS(tt)
+        mps = ITensorMPS.MPS(tt)
         @test linkdims(mps) == [4, 2, 7]
     end
 
     @testset "TT to MPO conversion and back" begin
         tt = TCI.TensorTrain([rand(1, 4, 3, 4), rand(4, 2, 4, 2), rand(2, 5, 1, 7), rand(7, 9, 4, 1)])
-        mpo = ITensors.MPO(tt)
+        mpo = ITensorMPS.MPO(tt)
         @test linkdims(mpo) == [4, 2, 7]
         @test dim.(siteinds(mpo)[1]) == [4, 3]
         @test dim.(siteinds(mpo)[2]) == [2, 4]