(closes #2676) Fix Nemo reproducibility issue

[sergisiso]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.86%. Comparing base (2ce711d) to head (2cffc16).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2679   +/-   ##
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  Coverage   99.86%   99.86%           
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  Files         353      353           
  Lines       48806    48818   +12     
=======================================
+ Hits        48741    48753   +12     
  Misses         65       65           

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[sergisiso]

@arporter This is ready to review. The integration tests all pass now.

[arporter]

Well done for tracking this down Sergi. I think it's fine but it would be better if we could put the functionality in the transformations themselves rather than utils.py, if that's possible?
Also, please could you tweak the nemo_tests.yml file so that it fails with a better error when the results don't match?
Integration tests were all green. I'll check the Ref. Guide next time.

[sergisiso]

@arporter CI and integration test-permitting (which I just triggered), this is ready for another review.

[arporter]

Changes look good. Thanks for improving the error handling in the integration tests.
Ref. guide builds fine.
Integration tests were all green.
Will proceed to merge.

[arporter]

Somehow I pressed the wrong button last time. This is ready to go!

[arporter]

Just to say, I checked performance too and it was all fine.