code: def convert_tokens_to_ids(self, tokens):
      return convert_by_vocab(self.vocab, tokens)
  
file_path: OpenNRE/opennre/tokenization/bert_tokenizer.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
  import unicodedata
  import six
  from .basic_tokenizer import BasicTokenizer
  from .word_piece_tokenizer import WordpieceTokenizer
  from .utils import convert_to_unicode, load_vocab, convert_by_vocab, convert_tokens_to_ids, convert_ids_to_tokens
label_desc: Use image node_id 3 for calling the BertTokenizer obj's underlying member method code with example usage: obj.convert_tokens_to_ids(tokens) and returns: convert_by_vocab