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Quellcode für qiskit.transpiler.passes.utils.dag_fixed_point

# This code is part of Qiskit.
#
# (C) Copyright IBM 2017, 2019.
#
# 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 the DAG has reached a fixed point."""

from copy import deepcopy

from qiskit.transpiler.basepasses import AnalysisPass


[Doku]class DAGFixedPoint(AnalysisPass): """Check if the DAG has reached a fixed point. A dummy analysis pass that checks if the DAG a fixed point (the DAG is not modified anymore). The results is saved in ``property_set['dag_fixed_point']`` as a boolean. """
[Doku] def run(self, dag): """Run the DAGFixedPoint pass on `dag`.""" if self.property_set["_dag_fixed_point_previous_dag"] is None: self.property_set["dag_fixed_point"] = False else: fixed_point_reached = self.property_set["_dag_fixed_point_previous_dag"] == dag self.property_set["dag_fixed_point"] = fixed_point_reached self.property_set["_dag_fixed_point_previous_dag"] = deepcopy(dag)