64 lines
3.9 KiB
Plaintext
64 lines
3.9 KiB
Plaintext
---
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title: PassManagerConfig
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description: API reference for qiskit.transpiler.PassManagerConfig
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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.PassManagerConfig
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---
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# PassManagerConfig
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<Class id="qiskit.transpiler.PassManagerConfig" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.20/qiskit/transpiler/passmanager_config.py" signature="PassManagerConfig(initial_layout=None, basis_gates=None, inst_map=None, coupling_map=None, layout_method=None, routing_method=None, translation_method=None, scheduling_method=None, instruction_durations=None, backend_properties=None, approximation_degree=None, seed_transpiler=None, timing_constraints=None, unitary_synthesis_method='default', unitary_synthesis_plugin_config=None, target=None)" modifiers="class">
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Bases: `object`
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Pass Manager Configuration.
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Initialize a PassManagerConfig object
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**Parameters**
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* **initial\_layout** ([*Layout*](qiskit.transpiler.Layout "qiskit.transpiler.Layout")) – Initial position of virtual qubits on physical qubits.
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* **basis\_gates** (*list*) – List of basis gate names to unroll to.
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* **inst\_map** ([*InstructionScheduleMap*](qiskit.pulse.InstructionScheduleMap "qiskit.pulse.InstructionScheduleMap")) – Mapping object that maps gate to schedule.
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* **coupling\_map** ([*CouplingMap*](qiskit.transpiler.CouplingMap "qiskit.transpiler.CouplingMap")) – Directed graph represented a coupling map.
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* **layout\_method** (*str*) – the pass to use for choosing initial qubit placement.
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* **routing\_method** (*str*) – the pass to use for routing qubits on the architecture.
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* **translation\_method** (*str*) – the pass to use for translating gates to basis\_gates.
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* **scheduling\_method** (*str*) – the pass to use for scheduling instructions.
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* **instruction\_durations** ([*InstructionDurations*](qiskit.transpiler.InstructionDurations "qiskit.transpiler.InstructionDurations")) – Dictionary of duration (in dt) for each instruction.
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* **backend\_properties** ([*BackendProperties*](qiskit.providers.models.BackendProperties "qiskit.providers.models.BackendProperties")) – Properties returned by a backend, including information on gate errors, readout errors, qubit coherence times, etc.
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* **approximation\_degree** (*float*) – heuristic dial used for circuit approximation (1.0=no approximation, 0.0=maximal approximation)
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* **seed\_transpiler** (*int*) – Sets random seed for the stochastic parts of the transpiler.
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* **timing\_constraints** (*TimingConstraints*) – Hardware time alignment restrictions.
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* **unitary\_synthesis\_method** (*str*) – The string method to use for the [`UnitarySynthesis`](qiskit.transpiler.passes.UnitarySynthesis "qiskit.transpiler.passes.UnitarySynthesis") pass. Will search installed plugins for a valid method.
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* **target** ([*Target*](qiskit.transpiler.Target "qiskit.transpiler.Target")) – The backend target
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## Methods
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### from\_backend
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<Function id="qiskit.transpiler.PassManagerConfig.from_backend" signature="PassManagerConfig.from_backend(backend, **pass_manager_options)" modifiers="classmethod">
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Construct a configuration based on a backend and user input.
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This method automatically gererates a PassManagerConfig object based on the backend’s features. User options can be used to overwrite the configuration.
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**Parameters**
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* **backend** ([*BackendV1*](qiskit.providers.BackendV1 "qiskit.providers.BackendV1")) – The backend that provides the configuration.
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* **pass\_manager\_options** – User-defined option-value pairs.
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**Returns**
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The configuration generated based on the arguments.
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**Return type**
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[PassManagerConfig](qiskit.transpiler.PassManagerConfig "qiskit.transpiler.PassManagerConfig")
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**Raises**
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**AttributeError** – If the backend does not support a configuration() method.
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</Function>
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</Class>
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