dimod.ConstrainedQuadraticModel.remove_constraint#

ConstrainedQuadraticModel.remove_constraint(label: Hashable, *, cascade: bool = False)[source]#

Remove a constraint from the model.

Parameters:

  • label – Label of the constraint to remove.

  • cascade – If set to True, also removes any variables found only in the removed constraint that contribute no energy to the objective.

Examples

This example also removes variable k from the model when removing the constraint while keeping the variables used in the objective.

>>> cqm = dimod.ConstrainedQuadraticModel()
>>> i, j, k = dimod.Integers(["i", "j", "k"])
>>> cqm.set_objective(2 * i - 3 * i * j)
>>> cqm.add_constraint_from_comparison(i * k - 2 * j <= 4, label="C1")
'C1'
>>> cqm.remove_constraint("C1", cascade=True)
>>> cqm.variables
Variables(['i', 'j'])