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""" Common utilities for testing model selection. """ import numpy as np from sklearn.model_selection import KFold class OneTimeSplitter: """A wrapper to make KFold single entry cv iterator""" def __init__(self, n_splits=4, n_samples=99): self.n_splits = n_splits self.n_samples = n_samples self.indices = iter(KFold(n_splits=n_splits).split(np.ones(n_samples))) def split(self, X=None, y=None, groups=None): """Split can be called only once""" for index in self.indices: yield index def get_n_splits(self, X=None, y=None, groups=None): return self.n_splits
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