code: def __iter__(self):
      for count, data in enumerate(self.dataset):
          if (
              count % self._worker_info.num_workers
              != self._worker_info.fid
          ):
              continue
          time.sleep(0.1)
          yield data
  
imports: import time
  import unittest
  import json
  import os
  import random
  from pgl.utils.data.dataset import Dataset, StreamDataset
  from pgl.utils.data.dataloader import Dataloader
label_desc: Use image node_id 2 for calling the IterDataset obj's underlying member method code with example usage: obj.__iter__() without return types