v0.13.9

[lkdvos]

Release notes

This release brings significant improvements to MPSKit.jl, including enhanced compatibility with multifusion categories, refactored algorithms, and numerous bug fixes.
Key improvements include a complete IDMRG refactoring, introduction of new trait systems for geometry and operator types, and enhanced performance with reduced allocations.

Key Features

🎯 New Features

Multifusion Categories

• Added full compatibility with multifusion categories (#297)

Trait System for Dispatching

• Introduced GeometryStyle and OperatorStyle traits for better type-based dispatching on finite/infinite geometries and operator types, improving code organization and extensibility (#352, #354)

Examples and Documentation

• Added comprehensive Bose-Hubbard example demonstrating strongly correlated bosonic systems (#342)
• Updated WindowMPS example with improved documentation and clearer explanations (#350)

🔧 Infrastructure Improvements

Algorithm Refactoring

• Complete refactoring of IDMRG to follow the IterativeSolver interface, improving code maintainability and enabling better code sharing between IDMRG and IDMRG2 implementations (#348)
• Refactored orthogonalization methods: removed _left_orth and _right_orth workarounds in favor of new, cleaner orthogonalization algorithms (#373)

Performance Optimization

• Optimized changebonds(state, ::RandExpand) algorithm to sample spaces directly instead of performing truncated SVD, improving performance while maintaining mathematical equivalence (#335)
• Reduced memory allocations while computing Galerkin error, leading to better performance in iterative algorithms (#366)

Dependency Updates & Compatibility

• Bumped compatibility for TensorKit 0.16 and MatrixAlgebraKit 0.6, ensuring compatibility with the latest versions of core dependencies (#365)
• Added LocalPreferences.toml file to ensure proper TensorOperations precompilation on testing infrastructure

User Experience

• Updated show methods to reflect new TensorKit printing conventions, providing clearer and more consistent output formatting (#341)
• More informative error messages for finite MPS operations, helping users diagnose issues more quickly (#367)
• Minor documentation and docstring improvements throughout the codebase (#363, #372, #371)

🐛 Bug Fixes

Numerical Stability

• Fixed dynamic tolerances yielding NaN during initialization due to 1 / sqrt(iter) where iter = 0, improving algorithm stability at the first iteration (#335)
• Fixed InfiniteMPOHamiltonian environments with low bond dimension and high Krylov dimension to be properly clamped, preventing numerical instabilities (#335)

Correctness Issues

• Fixed logical operator precedence bug in getproperty function that could lead to incorrect behavior (#346)
• Fixed domain/codomain mismatch in MPODerivativeOperator, ensuring correct tensor operations (#370)
• Corrected orthogonalization algorithms to use proper methods, ensuring mathematical correctness (#373)
• Improved handling of in-place operations to avoid unintended mutation errors (#337)

Minor Fixes

• Fixed typo in VUMPSSvdCut algorithm name (#361)
• Fixed typo in time formatting for log messages (#336)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
see 5 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.