DoWhileController
class qiskit.passmanager.DoWhileController(tasks=(), do_while=None, *, options=None)
Bases: BaseController
Run the given tasks in a loop until the do_while condition on the property set becomes False.
The given tasks will always run at least once, and on iteration of the loop, all the tasks will be run (with the exception of a failure state being set).
Create new flow controller.
Parameters
- options (dict[str, Any] | None) – Option for this flow controller.
- tasks (Task | Iterable[Task]) –
- do_while (Callable[[PropertySet], bool]) –
Attributes
passes
Alias of tasks for backward compatibility.
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]
iter_tasks
iter_tasks(state)
A custom logic to choose a next task to run.
Controller subclass can consume the state to build a proper task pipeline. The updated state after a task execution will be fed back in as the “return” value of any yield statements. This indicates the order of task execution is only determined at running time. This method is not allowed to mutate the given state object.
Parameters
- state (PassManagerState) – The state of the passmanager workflow at the beginning of this flow controller’s execution.
- state – the state of pass manager after the execution of the last task that was yielded. The generator does not need to inspect this if it is irrelevant to its logic, nor update it.
Yields
Task – Next task to run.
Return type
Generator[Task, PassManagerState, None]