code: def test_bare_string_params(self):
      reader = DatasetReader.from_params(
          Params({"type": "text_classification_json"})
      )
  
      class TestLoader(Registrable):
          @classmethod
          def from_partial_objects(
              cls, data_loader: Lazy[DataLoader]
          ) -> DataLoader:
              return data_loader.construct(
                  reader=reader,
                  data_path=str(
                      self.FIXTURES_ROOT
                      / "data"
                      / "text_classification_json"
                      / "imdb_corpus2.jsonl"
                  ),
              )
  
      TestLoader.register("test", constructor="from_partial_objects")(
          TestLoader
      )
  
      data_loader = TestLoader.from_params(
          Params({"type": "test", "data_loader": {"batch_size": 2}})
      )
      assert data_loader.batch_size == 2
  
imports: from typing import Dict, Iterable, List, Mapping, Optional, Set, Tuple, Union
  import pytest
  import torch
  from allennlp.common import Lazy, Params, Registrable
  from allennlp.common.from_params import FromParams, takes_arg, remove_optional, create_kwargs
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data import DataLoader, DatasetReader, Tokenizer
  from allennlp.models import Model
  from allennlp.models.archival import load_archive
  from allennlp.common.checks import ConfigurationError
label_desc: Use image node_id 20 for calling the TestFromParams obj's underlying member method code with example usage: obj.test_bare_string_params() and returns: data_loader