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Fixes a bug where backend_options would be passed to backends that don't support it. #51

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merged 4 commits into from Sep 14, 2019

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@josh146 josh146 commented Sep 13, 2019

Context: The current QiskitDevice assumes that all backends accept backend options, but this isn't the case --- hardware backends on IBMQ do not accept backend options. This leads to an TypeError for hardware-bound jobs.

Description of change:

  • inspect.signature is used to determine what keyword arguments the backend supports.

  • A new attribute self.run_args is now used to correctly store a dictionary of allowed keyword arguments.

  • Version number incrementation for a minor bugfix release.

Benefits: Fixes the bug

GitHub Issues: https://discuss.pennylane.ai/t/pennylane-qiskit-error/204

@josh146 josh146 added the bug Something isn't working label Sep 13, 2019
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codecov bot commented Sep 13, 2019

Codecov Report

Merging #51 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #51      +/-   ##
==========================================
+ Coverage   99.34%   99.35%   +<.01%     
==========================================
  Files           8        8              
  Lines         307      311       +4     
==========================================
+ Hits          305      309       +4     
  Misses          2        2
Impacted Files Coverage Δ
pennylane_qiskit/ibmq.py 100% <ø> (ø) ⬆️
pennylane_qiskit/_version.py 100% <100%> (ø) ⬆️
pennylane_qiskit/aer.py 100% <100%> (ø) ⬆️
pennylane_qiskit/qiskit_device.py 99.03% <100%> (+0.04%) ⬆️

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@josh146 josh146 added the WIP label Sep 13, 2019
@josh146 josh146 changed the title Fixes a bug where backend_options would be passed to backends that don't support it. [WIP] Fixes a bug where backend_options would be passed to backends that don't support it. Sep 13, 2019
@josh146 josh146 added review-ready and removed WIP labels Sep 13, 2019
@josh146 josh146 changed the title [WIP] Fixes a bug where backend_options would be passed to backends that don't support it. Fixes a bug where backend_options would be passed to backends that don't support it. Sep 13, 2019
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Approved, but a couple small questions and comments

super().__init__(wires, qiskit.Aer, backend=backend, shots=shots, **kwargs)
self._noise_model = noise_model

def run(self, qobj):
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how come this was removed?

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I noticed that this was part of the same bug. There were no tests for noise models, so it wasn't picked up. Since the logic for kwargs is now part of the base class, this method is redundant and can be removed.

tests/test_integration.py Outdated Show resolved Hide resolved
@josh146 josh146 merged commit 68f6969 into master Sep 14, 2019
@josh146 josh146 deleted the fix_ibmq_backend_options branch September 14, 2019 00:39
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