(self)
Create class splits.

    Specifically, create a dictionary whose keys are 'train', 'valid', and
    'test', and whose values are lists of the corresponding classes.
Create class splits.
Create class splits .
def create_splits(self):
    """Create class splits.

    Specifically, create a dictionary whose keys are 'train', 'valid', and
    'test', and whose values are lists of the corresponding classes.
    """
    raise NotImplementedError('Must be implemented in each sub-class.')
def create_splits ( self ) : raise NotImplementedError ( 'Must be implemented in each sub-class.' )