DOC parameter applies to groups not samples.
@@ -1452,7 +1452,7 @@ class GroupShuffleSplit(ShuffleSplit):
test_size : float, int, None, optional
If float, should be between 0.0 and 1.0 and represent the proportion
of the dataset to include in the test split. If int, represents the
- absolute number of test samples. If None, the value is set to the
+ absolute number of test groups. If None, the value is set to the
complement of the train size. By default, the value is set to 0.2.
The default will change in version 0.21. It will remain 0.2 only
if ``train_size`` is unspecified, otherwise it will complement
