def _clone_modify(oversampler, class_label, y_in_cluster):
"""Clone and modify attributes of oversampler for corner cases."""
# Clone oversampler
oversampler = clone(oversampler)
# Not modify attributes case
if isinstance(oversampler, RandomOverSampler):
return oversampler
# Select and modify oversampler
n_minority_samples = Counter(y_in_cluster)[class_label]
if n_minority_samples == 1:
oversampler = RandomOverSampler()
else:
if hasattr(oversampler, 'k_neighbors'):
oversampler.k_neighbors = _modify_nn(
oversampler.k_neighbors, n_minority_samples
)
if hasattr(oversampler, 'm_neighbors'):
oversampler.m_neighbors = _modify_nn(
oversampler.m_neighbors, y_in_cluster.size
)
if hasattr(oversampler, 'n_neighbors'):
oversampler.n_neighbors = _modify_nn(
oversampler.n_neighbors, n_minority_samples
)
return oversampler
