DenseLayout
class qiskit.transpiler.passes.DenseLayout(*args, **kwargs)
Bases: AnalysisPass
Choose a Layout by finding the most connected subset of qubits.
This pass associates a physical qubit (int) to each virtual qubit of the circuit (Qubit).
Even though a 'layout' is not strictly a property of the DAG, in the transpiler architecture it is best passed around between passes by being set in property_set.
DenseLayout initializer.
Parameters
- coupling_map (Coupling) – directed graph representing a coupling map.
- backend_prop (BackendProperties) – backend properties object
- target (Target) – A target representing the target backend.
Attributes
is_analysis_pass
Check if the pass is an analysis pass.
If the pass is an AnalysisPass, that means that the pass can analyze the DAG and write the results of that analysis in the property set. Modifications on the DAG are not allowed by this kind of pass.
is_transformation_pass
Check if the pass is a transformation pass.
If the pass is a TransformationPass, that means that the pass can manipulate the DAG, but cannot modify the property set (but it can be read).
Methods
execute
execute(passmanager_ir, state, callback=None)
Execute optimization task for input Qiskit IR.
Parameters
- passmanager_ir (Any) – Qiskit IR to optimize.
- state (PassManagerState) – State associated with workflow execution by the pass manager itself.
- callback (Callable | None) – A callback function which is caller per execution of optimization task.
Returns
Optimized Qiskit IR and state of the workflow.
Return type
tuple[Any, qiskit.passmanager.compilation_status.PassManagerState]
name
run
run(dag)
Run the DenseLayout pass on dag.
Pick a convenient layout depending on the best matching qubit connectivity, and set the property layout.
Parameters
dag (DAGCircuit) – DAG to find layout for.
Raises
TranspilerError – if dag wider than self.coupling_map
update_status
update_status(state, run_state)
Update workflow status.
Parameters
- state (PassManagerState) – Pass manager state to update.
- run_state (RunState) – Completion status of current task.
Returns
Updated pass manager state.
Return type