class_docstr: Iterable DataLoader Object
      
class_docstr_tok: ["Iterable","DataLoader","Object"]
code: def __call__(self):
      return self.__iter__()
  
imports: import warnings
  import time
  import numpy
  from collections import namedtuple
  import paddle
  import paddle.fluid
  import paddle.fluid.layers
  from pgl.utils import mp_reader
  from pgl.utils.data.dataset import Dataset, StreamDataset
  from pgl.utils.data.sampler import Sampler, StreamSampler
label_desc: Use image node_id 6 for calling the _DataLoaderIter obj's underlying member method code with example usage: obj.__call__() and returns: self