qiskit.transpiler.InstructionDurations¶

class
InstructionDurations
(instruction_durations=None, dt=None)[source]¶ Helper class to provide durations of instructions for scheduling.
It stores durations (gate lengths) and dt to be used at the scheduling stage of transpiling. It can be constructed from
backend
orinstruction_durations
, which is an argument oftranspile()
.
__init__
(instruction_durations=None, dt=None)[source]¶ Initialize self. See help(type(self)) for accurate signature.
Methods
__init__
([instruction_durations, dt])Initialize self.
from_backend
(backend)Construct an
InstructionDurations
object from the backend.get
(inst, qubits[, unit])Get the duration of the instruction with the name and the qubits.
Get the set of all units used in this instruction durations.
update
(inst_durations[, dt])Update self with inst_durations (inst_durations overwrite self).

classmethod
from_backend
(backend)[source]¶ Construct an
InstructionDurations
object from the backend. Parameters
backend (
BaseBackend
) – backend from which durations (gate lengths) and dt are extracted. Returns
The InstructionDurations constructed from backend.
 Return type
 Raises
TranspilerError – If dt and dtm is different in the backend.

get
(inst, qubits, unit='dt')[source]¶ Get the duration of the instruction with the name and the qubits.
 Parameters
inst (
Union
[str
,Instruction
]) – An instruction or its name to be queried.qubits (
Union
[int
,List
[int
],Qubit
,List
[Qubit
]]) – Qubits or its indices that the instruction acts on.unit (
str
) – The unit of duration to be returned. It must be ‘s’ or ‘dt’.
 Returns
The duration of the instruction on the qubits.
 Return type
floatint
 Raises
TranspilerError – No duration is defined for the instruction.

units_used
()[source]¶ Get the set of all units used in this instruction durations.
 Return type
Set
[str
] Returns
Set of units used in this instruction durations.

update
(inst_durations, dt=None)[source]¶ Update self with inst_durations (inst_durations overwrite self).
 Parameters
inst_durations (
Optional
[Union
[List
[Tuple
[str
,Optional
[Iterable
[int
]],float
,str
]],List
[Tuple
[str
,Optional
[Iterable
[int
]],float
]],InstructionDurations
]]) – Instruction durations to be merged into self (overwriting self).dt (
Optional
[float
]) – Sampling duration in seconds of the target backend.
 Returns
The updated InstructionDurations.
 Return type
 Raises
TranspilerError – If the format of instruction_durations is invalid.
