279 lines
10 KiB
Plaintext
279 lines
10 KiB
Plaintext
---
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title: QuantumInstance (v0.31)
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description: API reference for qiskit.utils.QuantumInstance in qiskit v0.31
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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.utils.QuantumInstance
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---
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# QuantumInstance
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<Class id="qiskit.utils.QuantumInstance" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.18/qiskit/utils/quantum_instance.py" signature="QuantumInstance(backend, shots=None, seed_simulator=None, max_credits=10, basis_gates=None, coupling_map=None, initial_layout=None, pass_manager=None, seed_transpiler=None, optimization_level=None, backend_options=None, noise_model=None, timeout=None, wait=5.0, skip_qobj_validation=True, measurement_error_mitigation_cls=None, cals_matrix_refresh_period=30, measurement_error_mitigation_shots=None, job_callback=None, mit_pattern=None)" modifiers="class">
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Bases: `object`
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Quantum Backend including execution setting.
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Quantum Instance holds a Qiskit Terra backend as well as configuration for circuit transpilation and execution. When provided to an Aqua algorithm the algorithm will execute the circuits it needs to run using the instance.
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**Parameters**
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* **backend** (*Union\['Backend', 'BaseBackend']*) – Instance of selected backend
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* **shots** (`Optional`\[`int`]) – Number of repetitions of each circuit, for sampling. If None, the shots are extracted from the backend. If the backend has none set, the default is 1024.
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* **seed\_simulator** (`Optional`\[`int`]) – Random seed for simulators
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* **max\_credits** (`int`) – Maximum credits to use
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* **basis\_gates** (`Optional`\[`List`\[`str`]]) – List of basis gate names supported by the target. Defaults to basis gates of the backend.
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* **coupling\_map** (*Optional\[Union\['CouplingMap', List\[List]]]*) – Coupling map (perhaps custom) to target in mapping
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* **initial\_layout** (*Optional\[Union\['Layout', Dict, List]]*) – Initial layout of qubits in mapping
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* **pass\_manager** (*Optional\['PassManager']*) – Pass manager to handle how to compile the circuits
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* **seed\_transpiler** (`Optional`\[`int`]) – The random seed for circuit mapper
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* **optimization\_level** (`Optional`\[`int`]) – How much optimization to perform on the circuits. Higher levels generate more optimized circuits, at the expense of longer transpilation time.
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* **backend\_options** (`Optional`\[`Dict`]) – All running options for backend, please refer to the provider of the backend for information as to what options it supports.
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* **noise\_model** (*Optional\['NoiseModel']*) – noise model for simulator
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* **timeout** (`Optional`\[`float`]) – Seconds to wait for job. If None, wait indefinitely.
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* **wait** (`float`) – Seconds between queries for job result
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* **skip\_qobj\_validation** (`bool`) – Bypass Qobj validation to decrease circuit processing time during submission to backend.
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* **measurement\_error\_mitigation\_cls** (`Optional`\[`Callable`]) – The approach to mitigate measurement errors. Qiskit Ignis provides fitter classes for this functionality and CompleteMeasFitter or TensoredMeasFitter from qiskit.ignis.mitigation.measurement module can be used here. TensoredMeasFitter doesn’t support subset fitter.
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* **cals\_matrix\_refresh\_period** (`int`) – How often to refresh the calibration matrix in measurement mitigation. in minutes
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* **measurement\_error\_mitigation\_shots** (`Optional`\[`int`]) – The number of shots number for building calibration matrix. If None, the main shots parameter value is used.
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* **job\_callback** (`Optional`\[`Callable`]) – Optional user supplied callback which can be used to monitor job progress as jobs are submitted for processing by an Aqua algorithm. The callback is provided the following arguments: job\_id, job\_status, queue\_position, job
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* **mit\_pattern** (`Optional`\[`List`\[`List`\[`int`]]]) – Qubits on which to perform the TensoredMeasFitter measurement correction, divided to groups according to tensors. If None and qr is given then assumed to be performed over the entire qr as one group (default None).
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**Raises**
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* **QiskitError** – the shots exceeds the maximum number of shots
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* **QiskitError** – set noise model but the backend does not support that
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* **QiskitError** – set backend\_options but the backend does not support that
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## Methods
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<span id="qiskit-utils-quantuminstance-assemble" />
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### assemble
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<Function id="qiskit.utils.QuantumInstance.assemble" signature="QuantumInstance.assemble(circuits)">
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assemble circuits
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**Return type**
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[`Qobj`](qiskit.qobj.Qobj "qiskit.qobj.Qobj")
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</Function>
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<span id="qiskit-utils-quantuminstance-cals-matrix" />
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### cals\_matrix
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<Function id="qiskit.utils.QuantumInstance.cals_matrix" signature="QuantumInstance.cals_matrix(qubit_index=None)">
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Get the stored calibration matrices and its timestamp.
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**Parameters**
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**qubit\_index** (`Optional`\[`List`\[`int`]]) – the qubit index of corresponding calibration matrix. If None, return all stored calibration matrices.
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**Return type**
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`Union`\[`Tuple`\[`ndarray`, `float`], `Dict`\[`str`, `Tuple`\[`ndarray`, `float`]], `None`]
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**Returns**
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The calibration matrix and the creation timestamp if qubit\_index is not None otherwise, return all matrices and their timestamp in a dictionary.
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</Function>
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<span id="qiskit-utils-quantuminstance-execute" />
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### execute
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<Function id="qiskit.utils.QuantumInstance.execute" signature="QuantumInstance.execute(circuits, had_transpiled=False)">
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A wrapper to interface with quantum backend.
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**Parameters**
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* **circuits** (*Union\['QuantumCircuit', List\['QuantumCircuit']]*) – circuits to execute
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* **had\_transpiled** (`bool`) – whether or not circuits had been transpiled
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**Raises**
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* **QiskitError** – Invalid error mitigation fitter class
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* **QiskitError** – TensoredMeasFitter class doesn’t support subset fitter
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* [**MissingOptionalLibraryError**](qiskit.aqua.MissingOptionalLibraryError "qiskit.aqua.MissingOptionalLibraryError") – Ignis not installed
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**Returns**
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result object
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**Return type**
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[Result](qiskit.result.Result "qiskit.result.Result")
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#### TODO: Maybe we can combine the circuits for the main ones and calibration circuits before
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assembling to the qobj.
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</Function>
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<span id="qiskit-utils-quantuminstance-maybe-refresh-cals-matrix" />
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### maybe\_refresh\_cals\_matrix
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<Function id="qiskit.utils.QuantumInstance.maybe_refresh_cals_matrix" signature="QuantumInstance.maybe_refresh_cals_matrix(timestamp=None)">
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Calculate the time difference from the query of last time.
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**Parameters**
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**timestamp** (`Optional`\[`float`]) – timestamp
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**Return type**
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`bool`
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**Returns**
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Whether or not refresh the cals\_matrix
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</Function>
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<span id="qiskit-utils-quantuminstance-reset-execution-results" />
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### reset\_execution\_results
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<Function id="qiskit.utils.QuantumInstance.reset_execution_results" signature="QuantumInstance.reset_execution_results()">
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Reset execution results
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**Return type**
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`None`
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</Function>
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<span id="qiskit-utils-quantuminstance-set-config" />
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### set\_config
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<Function id="qiskit.utils.QuantumInstance.set_config" signature="QuantumInstance.set_config(**kwargs)">
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Set configurations for the quantum instance.
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</Function>
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<span id="qiskit-utils-quantuminstance-transpile" />
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### transpile
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<Function id="qiskit.utils.QuantumInstance.transpile" signature="QuantumInstance.transpile(circuits)">
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A wrapper to transpile circuits to allow algorithm access the transpiled circuits. :param circuits: circuits to transpile :type circuits: Union\[‘QuantumCircuit’, List\[‘QuantumCircuit’]]
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**Returns**
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**The transpiled circuits, it is always a list even though**
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the length is one.
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**Return type**
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List\[‘QuantumCircuit’]
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</Function>
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## Attributes
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### backend
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<Attribute id="qiskit.utils.QuantumInstance.backend">
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Return BaseBackend backend object.
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</Attribute>
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### backend\_config
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<Attribute id="qiskit.utils.QuantumInstance.backend_config">
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Getter of backend\_config.
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</Attribute>
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### backend\_name
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<Attribute id="qiskit.utils.QuantumInstance.backend_name">
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Return backend name.
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</Attribute>
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### backend\_options
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<Attribute id="qiskit.utils.QuantumInstance.backend_options">
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Getter of backend\_options.
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</Attribute>
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### cals\_matrix\_refresh\_period
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<Attribute id="qiskit.utils.QuantumInstance.cals_matrix_refresh_period">
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returns matrix refresh period
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</Attribute>
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### circuit\_summary
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<Attribute id="qiskit.utils.QuantumInstance.circuit_summary">
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Getter of circuit summary.
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</Attribute>
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### compile\_config
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<Attribute id="qiskit.utils.QuantumInstance.compile_config">
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Getter of compile\_config.
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</Attribute>
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### is\_local
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<Attribute id="qiskit.utils.QuantumInstance.is_local">
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Return True if backend is a local backend.
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</Attribute>
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### is\_simulator
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<Attribute id="qiskit.utils.QuantumInstance.is_simulator">
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Return True if backend is a simulator.
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</Attribute>
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### is\_statevector
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<Attribute id="qiskit.utils.QuantumInstance.is_statevector">
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Return True if backend is a statevector-type simulator.
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</Attribute>
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### measurement\_error\_mitigation\_cls
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<Attribute id="qiskit.utils.QuantumInstance.measurement_error_mitigation_cls">
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returns measurement error mitigation cls
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</Attribute>
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### measurement\_error\_mitigation\_shots
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<Attribute id="qiskit.utils.QuantumInstance.measurement_error_mitigation_shots">
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returns measurement error mitigation shots
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</Attribute>
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### noise\_config
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<Attribute id="qiskit.utils.QuantumInstance.noise_config">
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Getter of noise\_config.
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</Attribute>
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### qjob\_config
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<Attribute id="qiskit.utils.QuantumInstance.qjob_config">
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Getter of qjob\_config.
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</Attribute>
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### run\_config
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<Attribute id="qiskit.utils.QuantumInstance.run_config">
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Getter of run\_config.
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</Attribute>
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### skip\_qobj\_validation
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<Attribute id="qiskit.utils.QuantumInstance.skip_qobj_validation">
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checks if skip qobj validation
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</Attribute>
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### time\_taken
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<Attribute id="qiskit.utils.QuantumInstance.time_taken">
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Accumulated time taken for execution.
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**Return type**
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`float`
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</Attribute>
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</Class>
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