code: def dataset_with_unknown_tokens():
      return TextData(
          label=[0, 1, 2],
          task_type="text_classification",
          raw_text=[
              "Explicit is better than ˚implicit.",
              "Simple is better than ∫complex.",
              "Complex is better than complicated.",
          ],
      )
  
file_path: deepchecks/tests/nlp/checks/data_integrity/unknown_tokens_test.py
imports: import pytest
  from hamcrest import *
  from transformers import AutoTokenizer, BertTokenizer
  from deepchecks.core.errors import DeepchecksValueError
  from deepchecks.nlp.checks import UnknownTokens
  from deepchecks.nlp.text_data import TextData
  from deepchecks.utils.strings import format_percent
  from tests.base.utils import equal_condition_result
label_desc: Use image node_id 2 for calling a global function with example usage: dataset_with_unknown_tokens() and returns: TextData