code: def __next__(self):
      torch.cuda.current_stream().wait_stream(self.stream)
      batch = self.batch
      if batch is None:
          raise StopIteration
      self.preload()
      return batch
  
imports: import numbers
  import os
  import queue
  import threading
  from typing import Iterable
  import mxnet
  import numpy
  import torch
  from functools import partial
  from torch import distributed
  from torch.utils.data import DataLoader, Dataset
  from torchvision import transforms
  from torchvision.datasets import ImageFolder
  from utils.utils_distributed_sampler import DistributedSampler
  from utils.utils_distributed_sampler import get_dist_info, worker_init_fn
label_desc: Use image node_id 4 for calling the DataLoaderX obj's underlying member method code with example usage: obj.__next__() and returns: batch