Fix performance of ReverseEstimatorGradient for partial gradients
#9491
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Cryoris
added
stable backport potential
Cryoris
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a team,
manoelmarques,
woodsp-ibm and
ElePT
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ElePT
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Jan 31, 2023
jakelishman
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Jan 31, 2023
Pull Request Test Coverage Report for Build 4053970489
💛 - Coveralls |
ElePT
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to ElePT/qiskit
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Jun 27, 2023
…Qiskit#9491) * Use append over += * add reno
ElePT
pushed a commit
to ElePT/qiskit-algorithms-test
that referenced
this pull request
Jul 17, 2023
…Qiskit/qiskit#9491) * Use append over += * add reno
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Summary
The
ReverseEstimatorGradientdid a lot of unnecessary copies if the circuit contained many gates with respect to whose parameter we didn't derive. That meant that e.g. computing all derivatives of a 100-parameter circuit was faster than computing only a single derivative.Details and comments
The circuit splitting used
instead of just
subcircuit.append. The first seems to copy all circuit instructions, which gets very expensive if called many times.Here's a profiling for computing 7 of ~100 parameters in an
EfficientSU2circuit before the fix:and after