code: def setUp(self):
      super(TestLazyDatasetReader, self).setUp()
      token_indexer = {"tokens": SingleIdTokenIndexer()}
  
      field1 = TextField(
          [Token(t) for t in ["this", "is", "a", "sentence", "."]],
          token_indexer,
      )
      field2 = TextField(
          [
              Token(t)
              for t in ["this", "is", "a", "different", "sentence", "."]
          ],
          token_indexer,
      )
      field3 = TextField(
          [Token(t) for t in ["here", "is", "a", "sentence", "."]],
          token_indexer,
      )
      field4 = TextField(
          [Token(t) for t in ["this", "is", "short"]], token_indexer
      )
      self.instances = [
          Instance({"text1": field1, "text2": field2}),
          Instance({"text1": field3, "text2": field4}),
      ]
  
file_path: magnitude/pymagnitude/third_party/allennlp/tests/data/dataset_readers/lazy_dataset_reader_test.py
imports: from __future__ import absolute_import
  from allennlp.data.fields import TextField
  from allennlp.data.instance import Instance
  from allennlp.data.dataset_readers import DatasetReader
  from allennlp.data.token_indexers import SingleIdTokenIndexer
  from allennlp.data.tokenizers import Token
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.common.util import ensure_list
label_desc: Use image node_id 1 for calling the TestLazyDatasetReader obj's underlying member method code with example usage: obj.setUp() without return types