code: def train_util_test_reader():
      @DatasetReader.register("train-util-test-reader")
      class TrainUtilTestReader(DatasetReader):
          def _read(self, data_path):
              logger.info(
                  "...train-util-test-reader reading from %s", data_path
              )
              for i in range(10):
                  yield self.text_to_instance(i)
  
          def text_to_instance(self, index: int) -> Instance:  # type: ignore
              return Instance(
                  {"index": LabelField(index, skip_indexing=True)}
              )
  
      yield TrainUtilTestReader
  
      del DatasetReader._registry[DatasetReader][
          "train-util-test-reader"
      ]
  
imports: import logging
  import os
  import pickle
  import pytest
  from allennlp.common.checks import ConfigurationError
  from allennlp.common.params import Params
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data.instance import Instance
  from allennlp.data.dataset_readers import DatasetReader
  from allennlp.data.fields import LabelField
  from allennlp.models import Model
  from allennlp.training.util import make_vocab_from_params, get_metrics
label_desc: Use image node_id 1 for calling a global function with example usage: train_util_test_reader() and returns: Instance