0.6.7

New Features

• Support Python 3.13.

Bug Fixes

• Fix SpinReversalTransformComposite's handling of child samplers
  that alter the variable order. Previously the spin reversal
  transforms would not be correctly unapplied.
  See #142.

0.6.6

New Features

• Speed up the removal of small biases in presolve.
• Support NumPy 2.0. Also, no longer require NumPy at build-time.

0.6.5

New Features

• Build with dimod 0.12.14. This speeds up the removal of small biases in presolve.

0.6.4

New Features

• Build C++ extensions with Cython 3.
• Build wheels for Python 3.12.

0.6.3

Bug Fixes

• Fix ImportError being raised on Windows when other dwave namespace packages are installed after dwave-preprocessing. See #130.

0.6.2

Bug Fixes

• Fix the handling of quadratic constraints in presolve. Previously fixing variables in quadratic constraints would result in memory errors. See dimod#1351.

0.6.1

New Features

• Speed up PresolverImpl::normalization_remove_invalid_markers() C++ method. This gives faster presolve normalization times for models with many discrete constraints.
• Speed up PresolverImpl::technique_remove_small_biases() C++ method. This gives faster presolve times for models with many small biases.

0.6.0

New Features

• Make SpinReversalTransformComposite nonblocking.

• Add a seed parameter to the constructor of SpinReversalTransformComposite.

• Improve the performance of the Presolver constructor by avoiding an unnecessary copy.

• Raise an InvalidModelError from Presolver when given a model with float("nan") bounds.

• Raise an InvalidModelError from Presolver when given a model that has a constraint with float("nan") weight or rhs.

• Add C++ Presolver::restore() method for restoring samples.

• Add domain propagation to dwave::presolve::Presolver.

• Add removing small biases to dwave::presolve::Presolver.

• Support Numpy>=1.17.3, previously required NumPy>=1.20.0.

• Add a presolve normalization step to replace inf biases, bounds, offsets, right-hand-sides, etc with a large finite number.

• A newly instantiated Presolver will now have presolve techniques loaded by default.

• Add TechniqueFlags enum to represent different presolve techniques.

• Add C++ dwave::presolve::Presolver::add_techniques(), dwave::presolve::Presolver::set_techniques(), and dwave::presolve::Presolver::techniques() methods for manipulating the presolve techniques that will be used by the presolver.

• Update Presolver.apply(), Presolver.normalize(), and Presolver.presolve() to release Python's global interpreter lock (GIL).

• Reimplement the C++ Presolver using the PImpl pattern. This will make it easier to maintain binary compatibility going forward. See #89.

• Add dwave::presolve::Presolve::normalize() C++ method.

• Add dwave::presolve::Presolve::presolve() C++ method.

• Raise an InvalidModelError from Presolver when given a model with float("nan") biases.

• Add Presolver.feasibility() method to return a Feasibility enum. This can be used to test the feasibility of presolved models.

• Add time_limit_s keyword argument to Presolver.presolve().

• Add time_limit argument to C++ method dwave::presolve::Presolver::presolve().

• Add Presolver.normalize() method. See #78.

• Add Presolver.presolve() method. See #78.

Upgrade Notes

• The wrapped C++ dwave::presolve::Presolver held by cyPresolver.cpppresolver is now stored as a pointer.

• Remove C++ PostSolver class. See #90.

• A newly instantiated Presolver will now have presolve techniques loaded by default. Previously it would have no techniques loaded and the user would need to also call Presolver.load_default_presolvers().

• Remove the C++ dwave::presolve::Presolver::load_default_presolvers() method.

• The C++ Presolver no longer has a header-only implementation.

• Raise an InvalidModelError rather than a RuntimeError when presolving a detached model.

• Change Presolver to no longer raise an InfeasibleModelError error for infeasible models.

• Remove the InfeasibleModelError.

Deprecation Notes

• Drop support for Python 3.7.

• Deprecate Presolver.load_default_techniques(). Use Presolver.set_techniques(TechniqueFlags.Default) instead.

0.5.4

Prelude

Begin using Reno changelog tool.

New Features

• Release wheels for Python 3.11

0.5.3

Features

• Remove interactions and variables with 0 bias in Presolver

Fixes

• Fix handling of empty soft constraint in Presolver.