code: def setUp(self):
      super(IteratorTest, self).setUp()
      self.token_indexers = {"tokens": SingleIdTokenIndexer()}
      self.vocab = Vocabulary()
      self.this_index = self.vocab.add_token_to_namespace("this")
      self.is_index = self.vocab.add_token_to_namespace("is")
      self.a_index = self.vocab.add_token_to_namespace("a")
      self.sentence_index = self.vocab.add_token_to_namespace(
          "sentence"
      )
      self.another_index = self.vocab.add_token_to_namespace("another")
      self.yet_index = self.vocab.add_token_to_namespace("yet")
      self.very_index = self.vocab.add_token_to_namespace("very")
      self.long_index = self.vocab.add_token_to_namespace("long")
      instances = [
          self.create_instance(["this", "is", "a", "sentence"]),
          self.create_instance(["this", "is", "another", "sentence"]),
          self.create_instance(["yet", "another", "sentence"]),
          self.create_instance(
              [
                  "this",
                  "is",
                  "a",
                  "very",
                  "very",
                  "very",
                  "very",
                  "long",
                  "sentence",
              ]
          ),
          self.create_instance(["sentence"]),
      ]
  
      class LazyIterable(object):
          def __iter__(self):
              return (instance for instance in instances)
  
      self.instances = instances
      self.lazy_instances = LazyIterable()
  
imports: from __future__ import absolute_import
  from collections import Counter
  from allennlp.common import Params
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data import Instance, Token, Vocabulary
  from allennlp.data.dataset_readers.dataset_reader import _LazyInstances
  from allennlp.data.fields import TextField
  from allennlp.data.iterators import BasicIterator
  from allennlp.data.token_indexers import SingleIdTokenIndexer
label_desc: Use image node_id 1 for calling the IteratorTest obj's underlying member method code with example usage: obj.setUp() and returns: unknown