code: def built_bert_vocab_unit(vocab_path: str) -> BertVocabulary:
      """
      Build a :class:`preprocessor.units.BertVocabulary` given `vocab_path`.
  
      :param vocab_path: bert vocabulary path.
      :return: A built vocabulary unit.
  
      """
      vocab_unit = BertVocabulary(pad_value="[PAD]", oov_value="[UNK]")
      vocab_unit.fit(vocab_path)
      return vocab_unit
  
imports: from matchzoo.data_pack import DataPack
  from .units import Vocabulary
  from .build_unit_from_data_pack import build_unit_from_data_pack
  from .units import BertVocabulary
label_desc: Use image node_id 2 for calling a global function with example usage: built_bert_vocab_unit(vocab_path) and returns: vocab_unit