mirror of https://github.com/Qiskit/qiskit.git
50 lines
2.3 KiB
YAML
50 lines
2.3 KiB
YAML
---
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upgrade_transpiler:
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- |
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The following :func:`.transpile` and :func:`.generate_preset_pass_manager` input arguments,
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deprecated since Qiskit 1.3 , have been removed from the API:
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* `instruction_durations`
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* `timing_constraints`
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In addition to this, the specification of custom basis gates through the ``basis`` gate argument of
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:func:`.transpile` and :func:`.generate_preset_pass_manager`, also deprecated in Qiskit 1.3, is
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no longer allowed, and a ``ValueError`` will be raised in these cases.
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The information formerly provided through these can still be specified via the ``backend`` or
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``target`` arguments. You can build a `Target` instance with defined instruction durations doing::
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Target.from_configuration(..., instruction_durations=...)
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For specific timing constraints::
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Target.from_configuration(..., timing_constraints=...)
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And for custom basis gates, you can manually add them to the target or use ``.from_configuration``
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with a custom name mapping, for example::
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from qiskit.circuit.library import XGate
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from qiskit.transpiler.target import Target
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basis_gates = ["my_x", "cx"]
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custom_name_mapping = {"my_x": XGate()}
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target = Target.from_configuration(
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basis_gates=basis_gates, num_qubits=2, custom_name_mapping=custom_name_mapping
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)
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The :func:`.transpile` and :func:`.generate_preset_pass_manager` interfaces now
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raise a ``UserWarning`` when providing a ``coupling_map`` and/or ``basis_gates``
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along with a ``backend``. In these cases there are multiple sources of truth,
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the user intentions are not always clear, and there can be conflicts that
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:func:`.generate_preset_pass_manager` may not know how to resolve. In these cases,
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we highly encourage the creation of a custom target that combines the chosen
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constraints.
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One of these situations is the specification of a gate with 3 or more qubits in
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`backend` or `basis_gates` together with a custom coupling map. The coupling map
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does not provide the necessary connectivity details to be able to determine the
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action of the gate. In these cases, :func:`.transpile` and
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:func:`.generate_preset_pass_manager` now raise a ``ValueError``. |