code: def _check_exists(self):
      return os.path.exists(
          os.path.join(
              self.root, self.processed_folder, "images_evaluation"
          )
      ) and os.path.exists(
          os.path.join(
              self.root, self.processed_folder, "images_background"
          )
      )
  
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 4 for calling the Omniglot obj's underlying member method code with example usage: obj._check_exists() and returns: unknown