Dimod

New Features

- Add C++ `dimod::abc::QuadraticModelBase::remove_variables()` method
and accompanying overloads.
- Speed up C++ `dimod::Expression::remove_variables()` method.

New Features
- Build wheels for Python 3.12.
- Build C++ extensions with Cython 3.

New Features

- Add `mimo()` function for generating a multi-input multiple-output (MIMO) channel-decoding problem.
- Add `coordinated_multipoint()` function for generating a coordinated multi-point (CoMP) decoding problem.

New Features

- Make `SampleSet.relabel_variables()` non-blocking in all cases. Previously it would block when `inplace=False`.

- Implement `SampleSet` serialization schema version 3.2.0.

Version 3.2.0 replaces `float` values that represent integers with `int` in the `"data"` field of any arrays returned by `SampleSet.to_serializable()`. In some pathological cases this can result in a much smaller representation when the data dictionaries are json-serialized by avoiding the redundant `.0` appended to every value.

This is a backwards-compatible change.

- Add `penalization_method` parameter to `BinaryQuadraticModel.add_linear_inequality_constraint()`. It allows the use of unbalanced penalization <https://arxiv.org/abs/2211.13914> instead of the slack variables method for the inequality constraints.

Bug Fixes

- Fix the behavior of `SampleSet.relabel_variables()` when `inplace=True`. Previously the method incorrectly returned a copy when the sample set was unresolved.

Bug Fixes

- Fix ``dimod::ConstrainedQuadraticModel::fix_variables()`` C++ method to work correctly with quadratic objectives and constraints. This fixes a bug introduced in dimod 0.12.5. See [1351](https://github.com/dwavesystems/dimod/issues/1351).

New Features

- Add `Constraint.is_onehot()` method.
- Add `dimod::Expression::remove_variables()` C++ method. This method is useful for removing variables in bulk from the objective or constraints of a constrained quadratic model.