code: def __len__(self):
      return len(self.items)
  
file_path: PaddleSeg/contrib/DomainAdaptation/datasets/cityscapes_noconfig.py
imports: import os
  import random
  import numpy
  import collections.abc
  from PIL import Image, ImageOps, ImageFilter, ImageFile
  import paddle
  from paddle import io
  import paddleseg.transforms.functional
label_desc: Use image node_id 8 for calling the CityDataset obj's underlying member method code with example usage: obj.__len__() and returns: len