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According to the ManagedResults Documentation the class has a combine_results method, however when attempting to use it as follows:

job_set = IBMQJobManager().run(circs, backend=ibmq_backend, name='job-set-abc')
job_results = job_set.results()
job_results_combined = job_results.combine_results() # fails on this line
job_counts_combined = job_results_combined.get_counts()

I get the following error:

AttributeError: 'ManagedResults' object has no attribute 'combine_results'

Furthermore, the combine_results method is not listed under help(type(job_results)):

Does this mean that the method has been deprecated? If so how can I overcome this?

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1 Answer 1

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It's still there. See the source code: https://github.com/Qiskit/qiskit-ibmq-provider/blob/stable/0.8/qiskit/providers/ibmq/managed/managedresults.py#L178

Are you using the right version of qiskit-ibmq-provider? combine_results was introduced in 0.8.

If you do

import qiskit
print(qiskit.__qiskit_version__)

it'll show you the version of each element.

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  • $\begingroup$ hmm, strange, I very recently upgraded to v0.20 but qiskit-ibmq-provider is still on 0.7.2 $\endgroup$
    – MShakeG
    Sep 11, 2020 at 23:05
  • $\begingroup$ furthermore, when I execute in the anaconda prompt: pip show qiskit-ibmq-provider it shows v0.8, however when I start the python interpreter and run: qiskit.__qiskit_version__ I get v0.7.2, which is quite unexpected. $\endgroup$
    – MShakeG
    Sep 11, 2020 at 23:42

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