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Fixed bug in deepcopy of IBMBackend #902

Merged
merged 12 commits into from
Jul 6, 2023
Merged

Fixed bug in deepcopy of IBMBackend #902

merged 12 commits into from
Jul 6, 2023

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merav-aharoni
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Summary

Fixed infinite recursion when attempting to deepcopy an IBMBackend.

Details and comments

Fixes #899.
See also Qiskit/qiskit-ibm-provider#658.

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coveralls commented Jun 11, 2023 •
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Pull Request Test Coverage Report for Build 5476169550

  • 2 of 15 (13.33%) changed or added relevant lines in 1 file are covered.
  • No unchanged relevant lines lost coverage.
  • Overall coverage decreased (-0.2%) to 72.58%
Changes Missing Coverage Covered Lines Changed/Added Lines %
qiskit_ibm_runtime/ibm_backend.py 2 15 13.33%
Totals Coverage Status
Change from base Build 5470974000: -0.2%
Covered Lines: 2594
Relevant Lines: 3574
💛 - Coveralls

@merav-aharoni merav-aharoni marked this pull request as ready for review June 11, 2023 13:21
@merav-aharoni merav-aharoni requested a review from kt474 June 11, 2023 13:21
@ElePT ElePT mentioned this pull request Jun 14, 2023
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@merav-aharoni
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When using the default deepcopy, we got a bug because IBMBackend contains a QiskitRuntimeService, and that contains a list of all the supported backends. So if the list of backends was already loaded in the method QiskitRuntimeService.backends(), we got an infinite recursion bug.
In a conversation with @jyu00 and @kt474 , we decided to implement a deepcopy method for IBMBackend, to avoid this problem. In this implementation, the list of backends in IBMBackend._service._backends is copied and not deepcopied.

@merav-aharoni
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@kt474 - can you review again?

kt474
kt474 approved these changes Jul 5, 2023
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LGTM!

@kt474 kt474 merged commit e6d48bc into Qiskit:main Jul 6, 2023
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@merav-aharoni merav-aharoni deleted the deepcopy_bug branch August 13, 2023 07:29
@kt474 kt474 mentioned this pull request Aug 16, 2023
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@kt474 kt474 kt474 approved these changes

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Unable to deepcopy an IBMBackend
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@merav-aharoni @coveralls @kt474