code: def __iter__(self):
      self.i = 0
      self.n = self.batch_size
      return self
  
imports: from nvidia.dali import Pipeline, pipeline_def, ops, fn, types
  import numpy
  import os
  from functools import partial
  from math import floor
  from test_utils import compare_pipelines, get_dali_extra_path, RandomDataIterator, generator_random_axes_for_3d_input, generator_random_data, as_array
  from nose_utils import assert_raises
  from nose2.tools import params
label_desc: Use image node_id 2 for calling the SliceArgsIterator obj's underlying member method code with example usage: obj.__iter__() and returns: self