code: def test_bilou_from_tag(tag, expected):
      actual = bilou_utils.bilou_prefix_from_tag(tag)
  
      assert actual == expected
  
file_path: rasa/tests/nlu/utils/test_bilou_utils.py
imports: import logging
  from typing import Text, List, Optional
  from _pytest.logging import LogCaptureFixture
  import pytest
  from rasa.nlu.tokenizers.whitespace_tokenizer import WhitespaceTokenizer
  import rasa.nlu.utils.bilou_utils
  from rasa.nlu.constants import BILOU_ENTITIES
  from rasa.shared.nlu.constants import ENTITIES
  from rasa.shared.nlu.training_data.training_data import TrainingData
  from rasa.shared.nlu.training_data.message import Message
label_desc: Use image node_id 2 for calling a global function with example usage: test_bilou_from_tag(tag, expected) without return types