code: def test_remove_optional(self):
      optional_type = Optional[Dict[str, str]]
      bare_type = remove_optional(optional_type)  # type: ignore
      bare_bare_type = remove_optional(bare_type)
  
      assert bare_type == Dict[str, str]
      assert bare_bare_type == Dict[str, str]
  
      assert remove_optional(Optional[str]) == str
      assert remove_optional(str) == str
  
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 2 for calling the TestFromParams obj's underlying member method code with example usage: obj.test_remove_optional() without return types