code: def __next__(self):
      return next(self.iterator)[0]
  
imports: import copy
  import numpy
  import nvidia.dali.plugin.tf
  import tensorflow
  from nvidia.dali import Pipeline, fn
  from test_utils import RandomlyShapedDataIterator
label_desc: Use image node_id 3 for calling the UnwrapIterator obj's underlying member method code with example usage: obj.__next__() and returns: next