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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.","","\"\"\"Map (with minimum effort) a DAGCircuit onto a ``coupling_map`` adding swap gates.\"\"\"","","from qiskit.transpiler.basepasses import TransformationPass","from qiskit.transpiler.exceptions import TranspilerError","from qiskit.dagcircuit import DAGCircuit","from qiskit.transpiler.layout import Layout","from qiskit.circuit.library.standard_gates import SwapGate","from qiskit.transpiler.target import Target","from qiskit.transpiler.passes.layout import disjoint_utils","","","class BasicSwap(TransformationPass):"," \"\"\"Map (with minimum effort) a DAGCircuit onto a ``coupling_map`` adding swap gates.",""," The basic mapper is a minimum effort to insert swap gates to map the DAG onto"," a coupling map. When a cx is not in the coupling map possibilities, it inserts"," one or more swaps in front to make it compatible."," \"\"\"",""," def __init__(self, coupling_map, fake_run=False):"," \"\"\"BasicSwap initializer.",""," Args:"," coupling_map (Union[CouplingMap, Target]): Directed graph represented a coupling map."," fake_run (bool): if true, it will only pretend to do routing, i.e., no"," swap is effectively added."," \"\"\""," super().__init__()"," if isinstance(coupling_map, Target):"," self.target = coupling_map"," self.coupling_map = self.target.build_coupling_map()"," else:"," self.target = None"," self.coupling_map = coupling_map"," self.fake_run = fake_run",""," def run(self, dag):"," \"\"\"Run the BasicSwap pass on `dag`.",""," Args:"," dag (DAGCircuit): DAG to map.",""," Returns:"," DAGCircuit: A mapped DAG.",""," Raises:"," TranspilerError: if the coupling map or the layout are not"," compatible with the DAG, or if the ``coupling_map=None``."," \"\"\""," if self.fake_run:"," return self._fake_run(dag)",""," new_dag = dag.copy_empty_like()",""," if self.coupling_map is None:"," raise TranspilerError(\"BasicSwap cannot run with coupling_map=None\")",""," if len(dag.qregs) != 1 or dag.qregs.get(\"q\", None) is None:"," raise TranspilerError(\"Basic swap runs on physical circuits only\")",""," if len(dag.qubits) > len(self.coupling_map.physical_qubits):"," raise TranspilerError(\"The layout does not match the amount of qubits in the DAG\")"," disjoint_utils.require_layout_isolated_to_component("," dag, self.coupling_map if self.target is None else self.target"," )"," canonical_register = dag.qregs[\"q\"]"," trivial_layout = Layout.generate_trivial_layout(canonical_register)"," current_layout = trivial_layout.copy()",""," for layer in dag.serial_layers():"," subdag = layer[\"graph\"]",""," for gate in subdag.two_qubit_ops():"," physical_q0 = current_layout[gate.qargs[0]]"," physical_q1 = current_layout[gate.qargs[1]]"," if 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new_dag",""," def _fake_run(self, dag):"," \"\"\"Do a fake run the BasicSwap pass on `dag`.",""," Args:"," dag (DAGCircuit): DAG to improve initial layout.",""," Returns:"," DAGCircuit: The same DAG.",""," Raises:"," TranspilerError: if the coupling map or the layout are not"," compatible with the DAG."," \"\"\""," if len(dag.qregs) != 1 or dag.qregs.get(\"q\", None) is None:"," raise TranspilerError(\"Basic swap runs on physical circuits only\")",""," if len(dag.qubits) > len(self.coupling_map.physical_qubits):"," raise TranspilerError(\"The layout does not match the amount of qubits in the DAG\")",""," canonical_register = dag.qregs[\"q\"]"," trivial_layout = Layout.generate_trivial_layout(canonical_register)"," current_layout = trivial_layout.copy()",""," for layer in dag.serial_layers():"," subdag = layer[\"graph\"]"," for gate in subdag.two_qubit_ops():"," physical_q0 = current_layout[gate.qargs[0]]"," physical_q1 = current_layout[gate.qargs[1]]"," if 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