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Ran 08 Apr 2025 12:16AM UTC

Files 789

Run time 32s

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Committed 07 Apr 2025 11:09PM UTC coverage: 88.166% (-0.009%) from 88.175%

Job # 14321848283.1

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push

github

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web-flow

Commit Message

Fix tests that assume a trivial layout from compilation (#14192)

These tests all have a built-in assumption that if the trivial layout
produces a routed circuit, it will automatically be used at optimisation
levels 2 and 3.  This is not formally the case; only optimization levels
0 and 1 set that by default.

An implementation detail of the current VF2Layout pass causes it to
short-circuit out on the first possible solution without scoring, if the
number of virtual qubits matches the number of physical qubits.  This
allowed these tests to pass without any flakiness, even though some of
them used unseeded randomness in `GenericBackendV2`.  This
short-circuiting in VF2Layout is based on a false premise that all
"complete" isomorphic layouts must have the same score, but this is not
actually correct, and follow-on modifications to the VF2 pass might
change this.

Run Details

73501 of 83367 relevant lines covered (88.17%)

436815.78 hits per line

Qiskit / qiskit / 14321848283 / 1
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main: 88%

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