code: def tokenize(self, sentence_str):
          '''
          Tokenize str.
          
          Args:
              sentence_str:   tokenized string.
          
          Returns:
              [token, token, token, ...]
          '''
          mt = MeCab.Tagger("-Owakati")
          wordlist = mt.parse(sentence_str)
          token_list = wordlist.rstrip(" \n").split(" ")
          return token_lisf tokenize(self, sentence_str):
          '''
          Tokenize str.
          
          Args:
              sentence_str:   tokenized string.
          
          Returns:
              [token, token, token, ...]
          '''
          mt = MeCab.Tagger("-Owakati")
          wordlist = mt.parse(sentence_str)
          token_list = wordlist.rstrip(" \n").split(" ")
          return token_list
docs: Tokenize str.
          
          Args:
              sentence_str:   tokenized string.
          
          Returns:
              [token, token, token, ...]