mirror of https://github.com/Qiskit/qiskit.git
43 lines
1.6 KiB
YAML
43 lines
1.6 KiB
YAML
---
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upgrade:
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- |
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Support for passing in lists of argument values to the :func:`~.transpile`
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function is removed. This functionality was deprecated as part of the
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0.23.0 release and is now being removed. You are still able to pass in a
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list of :class:`~.QuantumCircuit` objects for the first positional argument,
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what has been removed is the broadcasting lists of the other arguments to
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each circuit in that input list. Removing this functionality was necessary
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to greatly reduce the overhead for parallel execution for transpiling
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multiple circuits at once. If you’re using this functionality
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currently you can call :func:`~.transpile` multiple times instead. For
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example if you were previously doing something like::
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from qiskit.transpiler import CouplingMap
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from qiskit import QuantumCircuit
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from qiskit import transpile
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qc = QuantumCircuit(2)
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qc.h(0)
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qc.cx(0, 1)
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qc.measure_all()
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cmaps = [CouplingMap.from_heavy_hex(d) for d in range(3, 15, 2)]
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results = transpile([qc] * 6, coupling_map=cmaps)
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instead you should now run something like::
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from qiskit.transpiler import CouplingMap
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from qiskit import QuantumCircuit
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from qiskit import transpile
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qc = QuantumCircuit(2)
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qc.h(0)
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qc.cx(0, 1)
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qc.measure_all()
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cmaps = [CouplingMap.from_heavy_hex(d) for d in range(3, 15, 2)]
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results = [transpile(qc, coupling_map=cm) for cm in cmap]
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You can also leverage :func:`~.parallel_map` or ``multiprocessing`` from
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the Python standard library if you want to run this in parallel.
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