0.12.5

New Features

• Add dimod::ConstrainedQuadraticModel::constraints() method that returns a view of the constraints that is easily iterated over.

• Improve the performance of fixing and removing variables from constrained quadratic model expressions.

• Implement the Expression::fix_variable() C++ method. Previously it would throw std::logic_error("not implemented - fix_variable").

• Improve the performance of ConstrainedQuadraticModel.fix_variable() and ConstrainedQuadraticModel.fix_variables().

• Add inplace keyword argument to ConstrainedQuadraticModel.fix_variables().

Upgrade Notes

• Add an overload to the C++ QuadraticModel::remove_variable() method. This is binary compatible, but it makes &remove_variable ambiguous.

• The ConstrainedQuadraticModel.fix_variables() function now returns a ConstrainedQuadraticModel rather than an empty dictionary.

• Change lp.load() and lp.loads() to raise a ValueErrorr rather than a RuntimeError when given an invalid file format.

• Make beta_range, num_reads, and num_sweeps keyword-only arguments for SimulatedAnnealingSampler.sample().

• Make num_reads and seed keyword-only arguments for RandomSampler.sample().

• Make initial_states, initial_states_generator, num_reads and seed keyword-only arguments for IdentitySampler.sample().

• Make rtol and atol keyword-only arguments for ExactCQMSolver.sample_cqm().

Bug Fixes

• Fix lp.load() and lp.loads() functions to correctly handle maximization objectives. See #1321.