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FakeBackend.refresh() doesn't always refresh #1993

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jyu00 opened this issue Oct 24, 2024 · 0 comments · May be fixed by #2020
Open

FakeBackend.refresh() doesn't always refresh #1993

jyu00 opened this issue Oct 24, 2024 · 0 comments · May be fixed by #2020
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@kt474
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bug Something isn't working
Milestone
0.34.0

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@jyu00
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jyu00 commented Oct 24, 2024

Describe the bug

The refresh() method in FakeBackendV2 only refreshes if the backend configuration changes:

qiskit-ibm-runtime/qiskit_ibm_runtime/fake_provider/fake_backend.py

Line 600 in 2e969ff

if updated_config != self._conf_dict:

But there is a high chance backend properties/defaults would change even if configuration stays the same.

In addition, it uses the cached objects even when updates are made:

qiskit-ibm-runtime/qiskit_ibm_runtime/fake_provider/fake_backend.py

Lines 593 to 595 in 2e969ff

real_props = real_backend.properties()
real_config = real_backend.configuration()
real_defs = real_backend.defaults()

But one would expect refresh() to fetch the latest and greatest.

Steps to reproduce

Expected behavior

Suggested solutions

This refresh() should always fetch/store the latest server data.

Additional Information

  • qiskit-ibm-runtime version:
  • Python version:
  • Operating system:
@jyu00 jyu00 added the bug Something isn't working label Oct 24, 2024
@kt474 kt474 self-assigned this Nov 6, 2024
@kt474 kt474 linked a pull request Nov 6, 2024 that will close this issue
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@kt474 kt474 added this to the 0.34.0 milestone Nov 8, 2024
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Successfully merging a pull request may close this issue.

Update fake backend refresh() kt474/qiskit-ibm-runtime
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@kt474 @jyu00