QuadraticProgramToQubo#

class QuadraticProgramToQubo(penalty=None)[source]#

Bases: QuadraticProgramConverter

Convert a given optimization problem to a new problem that is a QUBO.

Examples

>>> from qiskit_optimization.problems import QuadraticProgram
>>> from qiskit_optimization.converters import QuadraticProgramToQubo
>>> problem = QuadraticProgram()
>>> # define a problem
>>> conv = QuadraticProgramToQubo()
>>> problem2 = conv.convert(problem)

Parameters:: penalty (float | None) – Penalty factor to scale equality constraints that are added to objective. If None is passed, a penalty factor will be automatically calculated on every conversion.

Attributes

penalty#

Returns the penalty factor used in conversion.

Returns:: The penalty factor used in conversion.

Methods

convert(problem)[source]#

Convert a problem with linear constraints into new one with a QUBO form.

Parameters:: problem (QuadraticProgram) – The problem with linear constraints to be solved.
Returns:: The problem converted in QUBO format as minimization problem.
Raises:: QiskitOptimizationError – In case of an incompatible problem.
Return type:: QuadraticProgram

static get_compatibility_msg(problem)[source]#

Checks whether a given problem can be solved with this optimizer.

Checks whether the given problem is compatible, i.e., whether the problem can be converted to a QUBO, and otherwise, returns a message explaining the incompatibility.

Parameters:: problem (QuadraticProgram) – The optimization problem to check compatibility.
Returns:: A message describing the incompatibility.
Return type:: str

interpret(x)[source]#

Convert a result of a converted problem into that of the original problem.

Parameters:: x (ndarray | List[float]) – The result of the converted problem.
Returns:: The result of the original problem.
Return type:: ndarray

is_compatible(problem)[source]#

Checks whether a given problem can be solved with the optimizer implementing this method.

Parameters:: problem (QuadraticProgram) – The optimization problem to check compatibility.
Returns:: Returns True if the problem is compatible, False otherwise.
Return type:: bool