code: def _get_parser():
      parser = ArgumentParser(description="build_vocab.py")
      data_prepare_opts(parser, build_vocab_only=True)
      return parser
  
imports: import os
  import copy
  import multiprocessing
  import pyonmttok
  from functools import partial
  from onmt.utils.logging import init_logger, logger
  from onmt.utils.misc import set_random_seed, check_path
  from onmt.utils.parse import ArgumentParser
  from onmt.opts import data_prepare_opts
  from onmt.inputters.text_corpus import build_corpora_iters, get_corpora
  from onmt.inputters.text_utils import process, append_features_to_text
  from onmt.transforms import make_transforms, get_transforms_cls
  from onmt.constants import CorpusName, CorpusTask
  from collections import Counter
label_desc: Use image node_id 8 for calling a global function with example usage: _get_parser() and returns: parser