code: def __len__(self):
      pass
  
imports: import warnings
  from typing import Union, List, Optional, Any, TYPE_CHECKING, Protocol
  import numpy
  from sklearn.utils import check_random_state
  from torch.utils import data
label_desc: Use image node_id 1 for calling the SizeableDataset obj's underlying member method code with example usage: obj.__len__() without return types