def instance_only(instance):
    if instance is None:
        raise AttributeError('Can only be accessed via instance')
Prune splits from a tree based on size of child nodes. Merge members of
dataset/ETHPy150Open ulule/django-linguist/linguist/fields.py/instance_only--crossover with--dataset/ETHPy150Open CoAxLab/DeBaCl/debacl/level_set_tree.py/LevelSetTree._merge_by_size