Set max_trials for VF2Layout in preset pass managers. (backport #10054)
#10061
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* Set max_trials for VF2Layout in preset pass managers. By setting max_trials, we limit the number of layouts enumerated and scored when iterating through vf2_mapping(). This is necessary for scoring to complete in a reasonable amount of time for circuits with many connected components on larger (e.g. 400 qubit) devices. These limits were chosen using a fake 400 qubit device, using 200 connected components, where each component is a single CX gate. Because layout scoring scales linearly with the number of qubits in the circuit, 250,000 (O3) takes abount a minute, 25,000 (O2) takes about 6 seconds, and 2,500 (O1) takes less than a second. * Address review comments. * Return tuple of None instead for finer control and a better interface. * Add deprecation notice to release note. * Remove deprecation until 0.25.0. * Remove unused import. (cherry picked from commit f13b1ed)
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mtreinish
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May 2, 2023
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Changelog: Bugfix
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