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fix: Raise exception for probs with observable #280

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Issue #, if available:
#279

Description of changes:

Testing done:

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  • I have added tests that prove my fix is effective or that my feature works (if appropriate)
  • I have checked that my tests are not configured for a specific region or account (if appropriate)

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@speller26 speller26 requested a review from a team as a code owner October 24, 2024 22:41
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codecov bot commented Oct 24, 2024

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (278b2f6) to head (62d9021).

Additional details and impacted files
@@            Coverage Diff            @@
##              main      #280   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines         1251      1253    +2     
  Branches       163       164    +1     
=========================================
+ Hits          1251      1253    +2     

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@@ -576,6 +576,8 @@ def translate_result_type( # noqa: C901
observable = measurement.obs

if return_type is ObservableReturnTypes.Probability:
if observable:
raise qml.DeviceError("Probability result type not supported for observables")
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This looks to be causing some issues for the tests. Is this the expected outcome now?

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So at the moment the pl-device-tests are xfailing the hadamard gradient tests due to the incorrect results. We may instead need to xfail at a different location as now we get an error on execution, instead of on result comparison:

https://github.com/PennyLaneAI/pennylane/blob/883c3ed0a66d06841e074c90f59317972af36cee/pennylane/devices/tests/test_gradients_autograd.py#L141

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3 participants