Use custom plugin to download test data early#7169
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Downloading data when using pytest-xdist can lead to races where different workers see different sized datasets. We work around this problem by defining a custom plugin that runs before workers start and downloads all datasets.
betatim
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test_naive_bayes.py failures
csadorf
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Sep 3, 2025
csadorf
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Approving since it will resolve the immediate problem. We should keep an eye out for a more long-term solution, ideally one that fixes the root-cause within the sklearn code base.
We should reference scikit-learn/scikit-learn#32095 within the code at appropriate spots.
jameslamb
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Sep 3, 2025
KyleFromNVIDIA
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Running this in CI as I can't reproduce the failure locallyThe problem we were seeing in the naive bayes tests was that some test functions saw only a subset of the dataset. As a result there was not at least one sample from every class in the dataset. The reason this happened is some kind of race in the downloading and processing of the data. This happens because we use more than one worker for
pytest-xdist.We work around this problem by defining a custom plugin that runs before workers start and downloads all datasets.
The downside of this approach is that we need to manually list the datasets that get "pre-downloaded". I think that is Ok because we don't add new datasets frequently. But this could be improved.
An upside is that we only download each dataset once, not once per worker as we were doing so far.
More discussion and details in scikit-learn/scikit-learn#32095 - maybe it is possible to fix this at the level of scikit-learn. Which would be great as it would mean we can remove this plugin again.
xref #7152