Release Notes


New Features

  • Add dimod::QuadraticModelBase::energy() method to dimod/libcpp.pxd for Cython access.

  • Randomly generated variable and constraint labels now begin with a letter and do not contain dashes. This ensures that they can be serialized to LP files. See #1206.

Bug Fixes

  • Fix dimod.lp.dump() and dimod.lp.dumps() to output bounds for REAL variables.


New Features

  • Add dimod.lp.dump() and dimod.lp.dumps() functions to encode constrained quadratic models as LP files.

  • Expand supported NumPy version range to numpy>=1.17.3,<2.0.0

  • Add plant_solution keyword argument to dimod.generators.random_nae3sat(), dimod.generators.random_2in4sat() and dimod.generators.frustrated_loop functions. Add

  • Add dimod::QuadraticModel::add_quadratic_back() and dimod::BinaryQuadraticModel::add_quadratic_back() methods in C++ code.

  • Improve the performance of QuadraticModel.from_file(), which also improves the performance of ConstrainedQuadraticModel.from_file().

Deprecation Notes

  • Deprecated planted_solution keyword argument in dimod.generators.frustrated_loop().

Bug Fixes

  • Fix a performance regression to QuadraticModel.add_linear_from() introduced by #1170 as part of the 0.11.0 release.


New Features

  • Add dimod.generators.random_nae3sat() function for generating not-all-equal 3-satisfiability problems as binary quadratic models.

  • Add dimod.generators.random_2in4sat() function for generating 2-in-4 satisfiability problems as binary quadratic models.

Bug Fixes

  • Drop pyparsing dependency. The functionality that required it was removed in version 0.11.0.

  • Added missing import of BinaryQuadraticModel required by dimod.serialization.json.DimodDecoder


New Features

  • Add the ability to specify a default variable type and bounds for missing variables when calling QuadraticModel.add_linear() and QuadraticModel.add_linear_from().

  • Add QuadraticModel::swap() and BinaryQuadraticModel::swap() methods to the C++ code. See #928.

  • Add lp.loads() and lp.load() functions.

  • Improve the performance of the ConstrainedQuadraticModel.from_lp_file() method.

  • Improve the performance of iteration over Variables objects.

Upgrade Notes

  • Drop support for Numpy 1.19

  • Some malformed LP-files that previously caused ConstrainedQuadraticModel.from_lp_file() to emit a warning now raise an error instead.

  • Provide manylinux2014 wheels for Python 3.10 rather than manylinux2010.

Deprecation Notes

  • Deprecate ConstrainedQuadraticModel.from_lp_file() method. Users should use the more explicit lp.loads() and lp.load() functions instead. The ConstrainedQuadraticModel.from_lp_file() will be removed in dimod 0.13.0.

  • The default_lower_bounds and default_upper_bounds keyword arguments for ConstrainedQuadraticModel.from_lp_file() are deprecated and do nothing.

Bug Fixes

  • In the cqm_to_bqm function, set the Lagrange multiplier to one if the maximum absolute bias is zero.

  • dimod.variables.Variables objects now correctly raise an IndexError when given negative indices that are out of range.


New Features

  • Add BinaryQuadraticModel::lower_bound() and BinaryQuadraticModel::upper_bound() methods to the C++ code.

  • Improve the performance of the QuadraticModel.update() method.

  • Improve the performance of the ConstrainedQuadraticModel.set_objective() method.

  • QuadraticModel.update() now accepts binary quadratic models in addition to quadratic models.

  • Add QuadraticModel.add_variables_from_model() method. See #1157.



Add support for real-valued variables.

New Features

  • Improved deprecation warnings and documentation. See #192.

  • Add C++ Vartype::REAL, a new variable type for real-valued variables.

  • Support variables with Vartype::REAL in C++ QuadraticModel.

  • Add Vartype.REAL, a new variable type for real-valued variables.

  • Add Real() and Reals() functions for creating quadratic models with a single real-valued variable.

  • Support variables with Vartype.REAL in QuadraticModel.

  • ConstrainedQuadraticModel.to_file() now uses serialization format 1.2. This format is backwards compatibile.

  • Add vartype and linear_only arguments to ConstrainedQuadraticModel.num_biases().

  • Add vartype and include_objective arguments to ConstrainedQuadraticModel.num_quadratic_variables().

  • Add check_header keyword-only argument to ConstrainedQuadraticModel.from_file().

  • Add a global flag dimod.REAL_INTERACTIONS. When this flag is set to False, variables with variable type Vartype.REAL cannot have interactions. dimod.REAL_INTERACTIONS is set to False by default.

Upgrade Notes

  • Remove .vartypes, .lower_bounds, and .upper_bounds attributes from ConstrainedQuadraticModel.variables. These were previously deprecated in dimod 0.10.6.

  • Remove .vartype() method from ConstrainedQuadraticModel.variables. It was previously deprecated in dimod 0.10.6.

  • Remove bqm_index_labelled_input decorator. It was previously deprecated in dimod 0.10.8.

  • Remove SampleSet.is_writeable attribute.

  • Remove dimod.generators.knapsack(). It was previously deprecated in dimod 0.10.6.

  • Remove dimod.generators.multi_knapsack(). It was previously deprecated in dimod 0.10.6.

  • Remove dimod.generators.bin_packing(). It was previously deprecated in dimod 0.10.6.

  • Remove HigherOrderComposite.sample_ising() method. It was previously scheduled to be removed in dimod 0.10.0.

  • Remove PolySampler.sample(), PolySampler.sample_ising(), and PolySampler.sample_qubo() methods. These were previously scheduled to be removed in dimod 0.10.0.

  • AdjVectorBQM and AdjDictBQM are now aliases for BinaryQuadraticModel and DictBQM respectively rather than having their own implementation with a slightly different API. They were previously deprecated in dimod 0.10.0.

  • The dimod.bqm namespace has been removed.

  • The dimod.core.bqm namespace has been removed.

  • dimod::AdjVectorBQM has been removed from the C++ code.

  • Some composites were migrated to dwave-preprocessing in dimod0.10.0. Trying to import and use these composites from dimod now raises an exception rather than a warning. The affected composites:

    • ClipComposite

    • ConnectedComponentsComposite

    • FixedVariableComposite

    • RoofDualityComposite

    • ScaleComposite

    • SpinReversalTransformComposite

  • The fix_variables() was migrated to dwave-preprocessing in dimod 0.10.0. Trying to import and use it now raises an exception rather than a warning.

  • Packages that require binary compatibility with dimod and that were compiled with 0.10.0 will not work with 0.11.0.

Deprecation Notes

  • Deprecate support for the ConstrainedQuadraticModel.add_variable(v, vartype) argument order. Use ConstrainedQuadraticModel.add_variable(vartype, v) instead. See #969.

  • In the future, ConstrainedQuadraticModel.num_quadratic_variables() will also include the objective towards the count by default.

Bug Fixes

  • Fixes performance regression on energy calculations introduced in 0.10.0. See #1025