---
title: Task (latest version)
description: API reference for qiskit.passmanager.Task in the latest version of qiskit
source: https://quantum.cloud.ibm.com/docs/en/api/qiskit/qiskit.passmanager.Task
---

# Task

*class* `qiskit.passmanager.Task`

[GitHub](https://github.com/Qiskit/qiskit/tree/stable/2.5/qiskit/passmanager/base_tasks.py#L31-L54)

Bases: [`ABC`](https://docs.python.org/3/library/abc.html#abc.ABC), [`Generic`](https://docs.python.org/3/library/typing.html#typing.Generic)\[`IR`, `IR_OUT`]

An interface of the pass manager task.

The task takes an IR, and outputs a (possibly different) IR after some operation on it. A task can rely on the [`PropertySet`](/docs/api/qiskit/qiskit.passmanager.PropertySet "qiskit.passmanager.PropertySet") to communicate intermediate data among tasks.

## Methods

### execute

*abstractmethod* `execute(passmanager_ir, state, callback=None)`

[GitHub](https://github.com/Qiskit/qiskit/tree/stable/2.5/qiskit/passmanager/base_tasks.py#L38-L54)

Execute optimization task for input Qiskit IR.

**Parameters**

- **passmanager\_ir** (*IR*) – Qiskit IR to optimize.
- **state** ([*PassManagerState*](/docs/api/qiskit/qiskit.passmanager.PassManagerState "qiskit.passmanager.compilation_status.PassManagerState")) – State associated with workflow execution by the pass manager itself.
- **callback** ([*Callable*](https://docs.python.org/3/library/collections.abc.html#collections.abc.Callable)*\[\[*[*Task*](#qiskit.passmanager.Task "qiskit.passmanager.base_tasks.Task")*, IR\_OUT,* [*PropertySet*](/docs/api/qiskit/qiskit.passmanager.PropertySet "qiskit.passmanager.compilation_status.PropertySet")*,* [*float*](https://docs.python.org/3/library/functions.html#float)*,* [*int*](https://docs.python.org/3/library/functions.html#int)*], None] | None*) – A callback function which is called per execution of optimization task.

**Returns**

Optimized Qiskit IR and state of the workflow.

**Return type**

[tuple](https://docs.python.org/3/library/stdtypes.html#tuple)\[*IR\_OUT*, [*PassManagerState*](/docs/api/qiskit/qiskit.passmanager.PassManagerState "qiskit.passmanager.compilation_status.PassManagerState")]