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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Guidelines for updating this changelog

When making changes to this project, please update the "Unreleased" section with your changes under the appropriate category:

  • Added for new features.
  • Changed for changes in existing functionality.
  • Deprecated for soon-to-be removed features.
  • Removed for now removed features.
  • Fixed for any bug fixes.
  • Performance for performance improvements.

When releasing a new version, move the "Unreleased" changes to a new version section with the release date.

Unreleased

0.16.0 - 2025-12-08

Added

  • rrule for transpose operation (#319)
  • New functions for multifusion support: unitspace, zerospace, leftunitspace, rightunitspace, isunitspace (#291)
  • Support for projections and orthogonal complements (#312)

Changed

  • Improvements to the default printing of tensors, where only a (possibly compressed) representation of the (possibly truncated) list of diagonal blocks is printed. Use blocks(t) and subblocks(t) for a full inspection of the tensor data (#304, #322))
  • Updated left_orth, right_orth, left_null and right_null interfaces for MatrixAlgebraKit v0.6 (#312)
  • Updated ishermitian and isisometric implementations (#312)
  • Sector functions now by default use unit instead of one, isunit instead of isone, and dual instead of conj (#291)
  • Reworked TensorOperations implementation to use backend and allocator system (#311)
  • Major documentation update/overhaul (#289)
  • Added symmetric tensor tutorial as appendix (#316)
  • Improved error messages throughout codebase (#309)
  • eigvals and svdvals now output SectorVector objects, which do behave as AbstractVector but also have the option of iterating the blocks through Base.pairs. (#324

Deprecated

Removed

  • All deprecations from v0.15: old factorization function names (leftorth, rightorth, tsvd, eig, eigh)
  • Old truncation strategy names (truncdim, truncbelow)
  • Old factorization struct types (OrthogonalFactorization)
  • Old constructor syntaxes and deprecated rand* function names

Fixed

  • Avoid unnecessary copy in twist for tensors with bosonic braiding (#305)
  • Small fixes and typos (#295)
  • eig_vals, svd_vals, etc now all output SectorVector objects instead of DiagonalTensorMaps, in line with how MatrixAlgebraKit returns Vectors instead of Diagonals (#324

0.15.3 - 2025-10-30

Fixed

  • Fixed typo in show(::GradedSpace) (#308)
  • Updated printing of ProductSpace{<:Any,0}
  • Added tests for show methods

0.15.2 - 2025-10-28

Added

  • subblocks iterator for easier inspection of tensor data (#304)

Changed

  • Tensors no longer print their data by default, only their spaces. Use blocks(t) or subblocks(t) to inspect data (#304)
  • Updated compatibility to TensorKitSectors v0.3 (#290)
  • Refactored test suite and split into groups (#298)

Fixed

  • Fixed TruncationIntersection implementation and test (#300)
  • Avoided unnecessary allocations in rrules for contractions and tensor products (#306)

0.15.1 - 2025-10-09

Fixed

  • Small fixes and typo corrections (#295)

0.15.0 - 2025-10-03

Added

  • MatrixAlgebraKit as new backend for tensor factorizations (#230)
  • foreachblock(f, t::AbstractTensorMap...) - uniform interface to iterate through tensor blocks
  • eig_trunc and eigh_trunc - truncated eigenvalue decompositions
  • ominus (and unicode ⊖) - compute orthogonal complement of a space
  • Backend selection for factorizations - swap algorithms or implementations

Changed

  • left_orth and right_orth now always output tensors with a single connecting space
  • left_orth and right_orth now always have connecting space with isdual=false
  • Code formatter is now Runic.jl

Deprecated

  • Factorization functions leftorth, rightorth, tsvd, eig, eigh in favor of MatrixAlgebraKit variants (left_orth, right_orth, svd_compact, eig_full, eigh_full)
  • Truncation strategies: truncdim (use truncrank) and truncbelow (use trunctol)
  • OrthogonalFactorization structs (constructors deprecated to return equivalent MatrixAlgebraKit algorithm structs)

Removed

  • Direct permute-and-factorize operations (incompatible with permute vs braid distinction)
  • Polar decomposition behavior for left_orth/right_orth (use left_polar/right_polar instead for isposdef R factors)

0.14.0 - 2024-12-19

Added

  • DiagonalTensorMap type for representing tensor maps with diagonal blocks
  • reduceddim(V) function that sums up degeneracy dimensions for each sector
  • New index manipulation functions:
    • flip(t, i)
    • insertleftunit(t, i)
    • insertrightunit(t, i)
    • removeunit(t, i)

Changed

  • Singular values and eigenvalues now explicitly represented as DiagonalTensorMap instances
  • SVD truncation now guarantees smaller singular values are removed first, irrespective of sector quantum dimension

0.13.0 - 2024-11-24

Added

  • Refactored TensorMap constructors to align with Julia Array constructors
  • Convenience constructors: ones, zeros, rand, randn for tensors
  • TensorOperations v5 support

Changed

  • Scalar type as parameter to AbstractTensorMap type: AbstractTensorMap{E, S, N₁, N₂}
  • Default way to create uninitialized tensors is now TensorMap{E}(undef, codomain ← domain)
  • Behavior of copy for BraidingTensor to properly instantiate a TensorMap
  • TensorKitSectors promoted to separate package
  • TensorMap data structure now consists of single vector with blocks as views
  • FusionTree vertices now only use Int labels for GenericFusion sectors