code: def __init__(self, iterator):
      self.iterator = iterator
  
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 1 to create a new UnwrapIterator object  with example: obj = UnwrapIterator(iterator)