code: def __call__(self):
      return self.__iter__()
  
imports: import os
  import sys
  import time
  import warnings
  import numpy
  from collections import namedtuple
  import paddle
  from pgl.utils import mp_reader
  from pgl.utils.logger import log
  from pgl.utils.data.dataset import Dataset, StreamDataset
  from pgl.utils.data.sampler import Sampler, StreamSampler
  from pgl.distributed import DistGraphClient, DistGraphServer
  from utils.config import prepare_config
label_desc: Use image node_id 4 for calling the DistCPUDataloader obj's underlying member method code with example usage: obj.__call__() and returns: self