code: def _skip_punctuation(self):
      text = ". . . . ! ? # @"
  
      aug = naw.TfIdfAug(
          model_path=os.environ.get("MODEL_DIR"),
          action=Action.SUBSTITUTE,
      )
  
      augmented_data = aug.augment(text)
      augmented_text = augmented_data[0]
      self.assertEqual(text, augmented_text)
  
file_path: nlpaug/test/augmenter/word/test_tfidf.py
imports: import unittest
  import os
  import re
  from dotenv import load_dotenv
  import sklearn.datasets
  import nlpaug.augmenter.word
  import nlpaug.model.word_stats
  from nlpaug.util import Action
label_desc: Use image node_id 10 for calling the TestTfIdf obj's underlying member method code with example usage: obj._skip_punctuation() without return types