127 lines
5.1 KiB
Plaintext
127 lines
5.1 KiB
Plaintext
---
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title: DynamicCircuitInstructionDurations
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description: API reference for qiskit_ibm_provider.transpiler.passes.scheduling.DynamicCircuitInstructionDurations
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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_ibm_provider.transpiler.passes.scheduling.DynamicCircuitInstructionDurations
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---
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# DynamicCircuitInstructionDurations
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<Class id="qiskit_ibm_provider.transpiler.passes.scheduling.DynamicCircuitInstructionDurations" isDedicatedPage={true} github="https://github.com/qiskit/qiskit-ibm-provider/tree/stable/0.7/qiskit_ibm_provider/transpiler/passes/scheduling/utils.py" signature="DynamicCircuitInstructionDurations(instruction_durations=None, dt=None, enable_patching=True)" modifiers="class">
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For dynamic circuits the IBM Qiskit backend currently reports instruction durations that differ compared with those required for the legacy Qobj-based path. For now we use this class to report updated InstructionDurations. TODO: This would be mitigated by a specialized Backend/Target for dynamic circuit backends.
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Dynamic circuit instruction durations.
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## Attributes
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<span id="dynamiccircuitinstructiondurations-measure-patch-cycles" />
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### MEASURE\_PATCH\_CYCLES
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<Attribute id="qiskit_ibm_provider.transpiler.passes.scheduling.DynamicCircuitInstructionDurations.MEASURE_PATCH_CYCLES" attributeValue="160" />
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<span id="dynamiccircuitinstructiondurations-measure-patch-odd-offset" />
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### MEASURE\_PATCH\_ODD\_OFFSET
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<Attribute id="qiskit_ibm_provider.transpiler.passes.scheduling.DynamicCircuitInstructionDurations.MEASURE_PATCH_ODD_OFFSET" attributeValue="64" />
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## Methods
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<span id="dynamiccircuitinstructiondurations-from-backend" />
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### from\_backend
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<Function id="qiskit_ibm_provider.transpiler.passes.scheduling.DynamicCircuitInstructionDurations.from_backend" signature="DynamicCircuitInstructionDurations.from_backend(backend)" modifiers="classmethod">
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Construct an `InstructionDurations` object from the backend.
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**Parameters**
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**backend** ([`Backend`](/api/qiskit/qiskit.providers.Backend "(in Qiskit v0.45)")) – backend from which durations (gate lengths) and dt are extracted.
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**Returns**
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The InstructionDurations constructed from backend.
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**Return type**
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InstructionDurations
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**Raises**
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**TranspilerError** – If dt and dtm is different in the backend.
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</Function>
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<span id="dynamiccircuitinstructiondurations-get" />
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### get
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<Function id="qiskit_ibm_provider.transpiler.passes.scheduling.DynamicCircuitInstructionDurations.get" signature="DynamicCircuitInstructionDurations.get(inst, qubits, unit='dt', parameters=None)">
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Get the duration of the instruction with the name, qubits, and parameters.
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Some instructions may have a parameter dependent duration.
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**Parameters**
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* **inst** (*str |* [*qiskit.circuit.Instruction*](/api/qiskit/qiskit.circuit.Instruction "(in Qiskit v0.45)")) – An instruction or its name to be queried.
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* **qubits** (*int | list\[int]*) – Qubit indices that the instruction acts on.
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* **unit** (*str*) – The unit of duration to be returned. It must be ‘s’ or ‘dt’.
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* **parameters** (*list\[float] | None*) – The value of the parameters of the desired instruction.
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**Returns**
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The duration of the instruction on the qubits.
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**Return type**
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float|int
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**Raises**
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**TranspilerError** – No duration is defined for the instruction.
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</Function>
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<span id="dynamiccircuitinstructiondurations-units-used" />
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### units\_used
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<Function id="qiskit_ibm_provider.transpiler.passes.scheduling.DynamicCircuitInstructionDurations.units_used" signature="DynamicCircuitInstructionDurations.units_used()">
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Get the set of all units used in this instruction durations.
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**Return type**
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`set`\[`str`]
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**Returns**
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Set of units used in this instruction durations.
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</Function>
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<span id="dynamiccircuitinstructiondurations-update" />
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### update
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<Function id="qiskit_ibm_provider.transpiler.passes.scheduling.DynamicCircuitInstructionDurations.update" signature="DynamicCircuitInstructionDurations.update(inst_durations, dt=None)">
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Update self with inst\_durations (inst\_durations overwrite self). Overrides the default durations for certain hardcoded instructions.
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**Parameters**
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* **inst\_durations** (`Union`\[`List`\[`Tuple`\[`str`, `Optional`\[`Iterable`\[`int`]], `float`, `Optional`\[`Iterable`\[`float`]], `str`]], `List`\[`Tuple`\[`str`, `Optional`\[`Iterable`\[`int`]], `float`, `Optional`\[`Iterable`\[`float`]]]], `List`\[`Tuple`\[`str`, `Optional`\[`Iterable`\[`int`]], `float`, `str`]], `List`\[`Tuple`\[`str`, `Optional`\[`Iterable`\[`int`]], `float`]], [`InstructionDurations`](/api/qiskit/qiskit.transpiler.InstructionDurations "(in Qiskit v0.45)"), `None`]) – Instruction durations to be merged into self (overwriting self).
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* **dt** (`Optional`\[`float`]) – Sampling duration in seconds of the target backend.
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**Returns**
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The updated InstructionDurations.
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**Return type**
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InstructionDurations
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**Raises**
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**TranspilerError** – If the format of instruction\_durations is invalid.
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</Function>
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</Class>
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