code: def __len__(self):
      return len(self.all_items)
  
imports: import torchvision.transforms
  from PIL import Image
  import numpy
  import torch
  import torch.utils.data
  import os
  import os.path
  import errno
label_desc: Use image node_id 3 for calling the Omniglot obj's underlying member method code with example usage: obj.__len__() and returns: len