101 lines
4.7 KiB
Plaintext
101 lines
4.7 KiB
Plaintext
---
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title: Layout2qDistance (v1.2)
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description: API reference for qiskit.transpiler.passes.Layout2qDistance in qiskit v1.2
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in_page_toc_min_heading_level: 1
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python_api_type: class
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python_api_name: qiskit.transpiler.passes.Layout2qDistance
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---
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# Layout2qDistance
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<Class id="qiskit.transpiler.passes.Layout2qDistance" isDedicatedPage={true} github="https://github.com/Qiskit/qiskit/tree/stable/1.2/qiskit/transpiler/passes/layout/layout_2q_distance.py#L25-L77" signature="qiskit.transpiler.passes.Layout2qDistance(*args, **kwargs)" modifiers="class">
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Bases: [`AnalysisPass`](qiskit.transpiler.AnalysisPass "qiskit.transpiler.basepasses.AnalysisPass")
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Evaluate how good the layout selection was.
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Saves in `property_set['layout_score']` (or the property name in property\_name) the sum of distances for each circuit CX. The lower the number, the better the selection. Therefore, 0 is a perfect layout selection. No CX direction is considered.
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Layout2qDistance initializer.
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**Parameters**
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* **coupling\_map** (*Union\[*[*CouplingMap*](qiskit.transpiler.CouplingMap "qiskit.transpiler.CouplingMap")*,* [*Target*](qiskit.transpiler.Target "qiskit.transpiler.Target")*]*) – Directed graph represented a coupling map.
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* **property\_name** ([*str*](https://docs.python.org/3/library/stdtypes.html#str "(in Python v3.13)")) – The property name to save the score. Default: layout\_score
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## Attributes
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### is\_analysis\_pass
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<Attribute id="qiskit.transpiler.passes.Layout2qDistance.is_analysis_pass">
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Check if the pass is an analysis pass.
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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.
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</Attribute>
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### is\_transformation\_pass
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<Attribute id="qiskit.transpiler.passes.Layout2qDistance.is_transformation_pass">
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Check if the pass is a transformation pass.
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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).
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</Attribute>
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## Methods
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### execute
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<Function id="qiskit.transpiler.passes.Layout2qDistance.execute" github="https://github.com/Qiskit/qiskit/tree/stable/1.2/qiskit/passmanager/base_tasks.py#L72-L118" signature="execute(passmanager_ir, state, callback=None)">
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Execute optimization task for input Qiskit IR.
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**Parameters**
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* **passmanager\_ir** ([*Any*](https://docs.python.org/3/library/typing.html#typing.Any "(in Python v3.13)")) – Qiskit IR to optimize.
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* **state** ([*PassManagerState*](qiskit.passmanager.PassManagerState "qiskit.passmanager.compilation_status.PassManagerState")) – State associated with workflow execution by the pass manager itself.
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* **callback** ([*Callable*](https://docs.python.org/3/library/collections.abc.html#collections.abc.Callable "(in Python v3.13)") *| None*) – A callback function which is caller per execution of optimization task.
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**Returns**
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Optimized Qiskit IR and state of the workflow.
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**Return type**
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[tuple](https://docs.python.org/3/library/stdtypes.html#tuple "(in Python v3.13)")\[[*Any*](https://docs.python.org/3/library/typing.html#typing.Any "(in Python v3.13)"), [qiskit.passmanager.compilation\_status.PassManagerState](qiskit.passmanager.PassManagerState "qiskit.passmanager.compilation_status.PassManagerState")]
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</Function>
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### name
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<Function id="qiskit.transpiler.passes.Layout2qDistance.name" github="https://github.com/Qiskit/qiskit/tree/stable/1.2/qiskit/passmanager/base_tasks.py#L68-L70" signature="name()">
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Name of the pass.
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**Return type**
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[str](https://docs.python.org/3/library/stdtypes.html#str "(in Python v3.13)")
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</Function>
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### run
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<Function id="qiskit.transpiler.passes.Layout2qDistance.run" github="https://github.com/Qiskit/qiskit/tree/stable/1.2/qiskit/transpiler/passes/layout/layout_2q_distance.py#L50-L77" signature="run(dag)">
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Run the Layout2qDistance pass on dag. :param dag: DAG to evaluate. :type dag: DAGCircuit
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</Function>
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### update\_status
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<Function id="qiskit.transpiler.passes.Layout2qDistance.update_status" github="https://github.com/Qiskit/qiskit/tree/stable/1.2/qiskit/passmanager/base_tasks.py#L120-L138" signature="update_status(state, run_state)">
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Update workflow status.
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**Parameters**
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* **state** ([*PassManagerState*](qiskit.passmanager.PassManagerState "qiskit.passmanager.compilation_status.PassManagerState")) – Pass manager state to update.
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* **run\_state** (*RunState*) – Completion status of current task.
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**Returns**
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Updated pass manager state.
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**Return type**
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[*PassManagerState*](qiskit.passmanager.PassManagerState "qiskit.passmanager.compilation_status.PassManagerState")
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</Function>
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</Class>
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