ALAPSchedule
class qiskit.transpiler.passes.ALAPSchedule(*args, **kwargs)
Bases: BaseSchedulerTransform
ALAP Scheduling pass, which schedules the stop time of instructions as late as possible.
See BaseSchedulerTransform for the detailed behavior of the control flow operation, i.e. c_if.
The class qiskit.transpiler.passes.scheduling.alap.ALAPSchedule is deprecated as of qiskit 1.1.0. It will be removed no earlier than 3 months after the release date. Instead, use ALAPScheduleAnalysis, which is an analysis pass that requires a padding pass to later modify the circuit.
Attributes
CONDITIONAL_SUPPORTED
Default value: (<class 'qiskit.circuit.gate.Gate'>, <class 'qiskit.circuit.delay.Delay'>)
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 ALAPSchedule pass on dag.
Parameters
dag (DAGCircuit) – DAG to schedule.
Returns
A scheduled DAG.
Return type
Raises
- TranspilerError – if the circuit is not mapped on physical qubits.
- TranspilerError – if conditional bit is added to non-supported instruction.
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