[WIP] MatrixAlgebraKit decompositions

.github/workflows/CI.yml

@@ -28,7 +28,7 @@ jobs:
           - macOS-latest
           - windows-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
@@ -57,7 +57,7 @@ jobs:
           - windows-latest
     continue-on-error: true
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}

.github/workflows/Documentation.yml

@@ -20,7 +20,7 @@ jobs:
         os:
           - ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: julia-actions/setup-julia@latest
         with:
           version: ${{ matrix.version }}

.github/workflows/DocumentationCleanup.yml

@@ -16,7 +16,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout gh-pages branch
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           ref: gh-pages
       - name: Delete preview and history + push changes

.github/workflows/FormatCheck.yml

@@ -23,7 +23,7 @@ jobs:
         with:
           version: ${{ matrix.version }}
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Install JuliaFormatter and format
         # This will use the latest version by default but you can set the version like so:
         #

CITATION.cff

@@ -0,0 +1,27 @@
+cff-version: 1.2.0
+message: "If you use this software, please cite it as below."
+authors:
+- family-names: "Devos"
+  given-names: "Lukas"
+  orcid: "https://orcid.org/0000-0002-0256-4200"
+- family-names: "Haegeman"
+  given-names: "Jutho"
+  orcid: "https://orcid.org/0000-0002-0858-291X"
+title: "TensorKit.jl"
+version: "0.14.9"
+doi: "10.5281/zenodo.8421339"
+date-released: "2025-07-18"
+url: "https://github.com/Jutho/TensorKit.jl"
+preferred-citation:
+  type: article
+  authors:
+  - family-names: "Devos"
+    given-names: "Lukas"
+    orcid: "https://orcid.org/0000-0002-0256-4200"
+  - family-names: "Haegeman"
+    given-names: "Jutho"
+    orcid: "https://orcid.org/0000-0002-0858-291X"
+  doi: "10.48550/arXiv.2508.10076"
+  journal: "arXiv"
+  title: "TensorKit.jl: A Julia package for large-scale tensor computations, with a hint of category theory"
+  year: 2025

Project.toml

@@ -6,8 +6,11 @@ version = "0.14.9"
 [deps]
 LRUCache = "8ac3fa9e-de4c-5943-b1dc-09c6b5f20637"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
+MatrixAlgebraKit = "6c742aac-3347-4629-af66-fc926824e5e4"
+OhMyThreads = "67456a42-1dca-4109-a031-0a68de7e3ad5"
 PackageExtensionCompat = "65ce6f38-6b18-4e1d-a461-8949797d7930"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
+ScopedValues = "7e506255-f358-4e82-b7e4-beb19740aa63"
 Strided = "5e0ebb24-38b0-5f93-81fe-25c709ecae67"
 TensorKitSectors = "13a9c161-d5da-41f0-bcbd-e1a08ae0647f"
 TensorOperations = "6aa20fa7-93e2-5fca-9bc0-fbd0db3c71a2"
@@ -30,8 +33,11 @@ Combinatorics = "1"
 FiniteDifferences = "0.12"
 LRUCache = "1.0.2"
 LinearAlgebra = "1"
+MatrixAlgebraKit = "0.3"
+OhMyThreads = "0.8.0"
 PackageExtensionCompat = "1"
 Random = "1"
+ScopedValues = "1.3.0"
 Strided = "2"
 TensorKitSectors = "0.1"
 TensorOperations = "5.1"

README.md

@@ -153,6 +153,7 @@ Check out the [tutorial](https://jutho.github.io/TensorKit.jl/stable/man/tutoria
 full [documentation](https://jutho.github.io/TensorKit.jl/stable).
 
 ## Installation
+
 `TensorKit.jl` can be installed with the Julia package manager.
 From the Julia REPL, type `]` to enter the Pkg REPL mode and run:
 ```
@@ -180,3 +181,9 @@ platforms with a 64-bit architecture.
 Contributions are very welcome, as are feature requests and suggestions. Please open an [issue][issues-url] if you encounter any problems.
 
 [issues-url]: https://github.com/Jutho/TensorKit.jl/issues
+
+## Acknowledgements
+
+The design and development of the TensorKit.jl package have benefited from countless discussions with many people, including most current and former members of the Quantum Group at Ghent University.
+Being an open-source software project developed over the course of many years, we also thank all past, current and future contributors, including the bug reports and feature requests that have shaped this package.
+In particular, we like to thank [Maarten Van Damme](@maartenvd), who initiated the MPSKit.jl package on top of TensorKit.jl early-on, and has as such had a strong influence on the development and design decisions of the TensorKit.jl package.

docs/src/lib/spaces.md

@@ -90,6 +90,7 @@ dual
 conj
 flip
 ⊕
+⊖
 zero(::ElementarySpace)
 oneunit
 supremum

ext/TensorKitChainRulesCoreExt/TensorKitChainRulesCoreExt.jl

@@ -3,6 +3,7 @@ module TensorKitChainRulesCoreExt
 using TensorOperations
 using VectorInterface
 using TensorKit
+using TensorKit: foreachblock
 using ChainRulesCore
 using LinearAlgebra
 using TupleTools
@@ -11,6 +12,11 @@ import TensorOperations as TO
 using TensorOperations: promote_contract, tensoralloc_add, tensoralloc_contract
 using VectorInterface: promote_scale, promote_add
 
+using MatrixAlgebraKit
+using MatrixAlgebraKit: TruncationStrategy,
+                        svd_compact_pullback!, eig_full_pullback!, eigh_full_pullback!,
+                        qr_compact_pullback!, lq_compact_pullback!
+
 include("utility.jl")
 include("constructors.jl")
 include("linalg.jl")