code: def __len__(self) -> int:
      return self.length
  
imports: import io
  import os.path
  import pickle
  import string
  from collections.abc import Iterable
  from typing import Any, Callable, cast, List, Optional, Tuple, Union
  from PIL import Image
  from .utils import iterable_to_str, verify_str_arg
  from .vision import VisionDataset
label_desc: Use image node_id 3 for calling the LSUNClass obj's underlying member method code with example usage: obj.__len__() and returns: self