Quellcode für qiskit.transpiler.passes.utils.fixed_point

# This code is part of Qiskit.
# (C) Copyright IBM 2017, 2018.
# This code is licensed under the Apache License, Version 2.0. You may
# obtain a copy of this license in the LICENSE.txt file in the root directory
# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
# Any modifications or derivative works of this code must retain this
# copyright notice, and modified files need to carry a notice indicating
# that they have been altered from the originals.

"""Check if a property reached a fixed point."""

from copy import deepcopy

from qiskit.transpiler.basepasses import AnalysisPass

[Doku]class FixedPoint(AnalysisPass): """Check if a property reached a fixed point. A dummy analysis pass that checks if a property reached a fixed point. The results is saved in ``property_set['<property>_fixed_point']`` as a boolean. """ def __init__(self, property_to_check): """FixedPoint initializer. Args: property_to_check (str): The property to check if a fixed point was reached. """ super().__init__() self._property = property_to_check
[Doku] def run(self, dag): """Run the FixedPoint pass on `dag`.""" current_value = self.property_set[self._property] fixed_point_previous_property = "_fixed_point_previous_%s" % self._property if self.property_set[fixed_point_previous_property] is None: self.property_set["%s_fixed_point" % self._property] = False else: fixed_point_reached = self.property_set[fixed_point_previous_property] == current_value self.property_set["%s_fixed_point" % self._property] = fixed_point_reached self.property_set[fixed_point_previous_property] = deepcopy(current_value)