code: def pos_tag(cls, tokens):
      try:
          results = nltk.pos_tag(tokens)
      except LookupError:
          nltk.download("averaged_perceptron_tagger")
          results = nltk.pos_tag(tokens)
  
      return results
  
imports: from nlpaug.model.word_dict import WordDictionary
label_desc: Use image node_id 4 for calling the WordNet obj's underlying member method code with example usage: obj.pos_tag(cls, tokens) and returns: results