[MRG] Raise ValueError when trainset is empty in CVSplitters #12861
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thomasjpfan
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Feb 13, 2019
| def test_shuffle_split_empty_trainset(CVSplitter): | ||
| cv = CVSplitter(test_size=.99) | ||
| X, y = [[1]], [0] # 1 sample | ||
| assert_raises_regexp( |
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We seem to be moving to using pytest.raises for testing exceptions.
| 'samples={}'.format(self.p, n_samples) | ||
| ) | ||
| for combination in combinations(range(n_samples), self.p): | ||
| yield np.array(combination) |
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Since we are python >= 3 now, maybe:
yield from map(np.array, combinations(range(n_samples), self.p))
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I'd rather not, since this is not related to the PR
jnothman
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Feb 13, 2019
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This is +2, @thomasjpfan can you merge this? |
thomasjpfan
reviewed
Mar 22, 2019
| ValueError, | ||
| match='With n_samples=1, test_size=0.99 and train_size=None, ' | ||
| 'the resulting train set will be empty'): | ||
| train_test_split(X, test_size=.99) |
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Given that train_test_split is a commonly used function, a non-trival test such as X=[[1],[1],[1]] and test_size=0.67 would be useful.
xhluca
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Apr 28, 2019
xhluca
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Apr 28, 2019
…cikit-learn#12861)" This reverts commit 9314ff7.
xhluca
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Apr 28, 2019
…cikit-learn#12861)" This reverts commit 9314ff7.
koenvandevelde
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Jul 12, 2019
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Reference Issues/PRs
Closes #11028, following #11028 (comment)
What does this implement/fix? Explain your changes.
ValueError is raised in the CVSplitters if the resulting train set is empty. As far as I can tell, the test sets are never empty so no need to check.
No need to check either for the KFolds splitters or some
*Group*splitters, which have internal checks preventing the train set to be empty.Any other comments?