code: def main():
      parser = argparse.ArgumentParser()
      parser.add_argument("--root", type=str, default="data")
      parser.add_argument(
          "--bpe-vocab",
          default=None,
          type=int,
          help="Generate tokenized bitext with BPE of size K."
          "Default to None (disabled).",
      )
      parser.add_argument(
          "--bbpe-vocab",
          default=None,
          type=int,
          help="Generate tokenized bitext with BBPE of size K."
          "Default to None (disabled).",
      )
      parser.add_argument(
          "--byte-vocab",
          action="store_true",
          help="Generate tokenized bitext with bytes vocabulary",
      )
      parser.add_argument(
          "--char-vocab",
          action="store_true",
          help="Generate tokenized bitext with chars vocabulary",
      )
      args = parser.parse_args()
  
      preprocess_iwslt17(
          args.root,
          "fr",
          "en",
          args.bpe_vocab,
          args.char_vocab,
          args.bbpe_vocab,
          args.byte_vocab,
      )
  
imports: import argparse
  import os
  import os.path
  from collections import namedtuple
  from multiprocessing import cpu_count
  from typing import List, Optional
  import sentencepiece
  from fairseq.data.encoders.byte_bpe import ByteBPE
  from fairseq.data.encoders.byte_utils import byte_encode
  from fairseq.data.encoders.bytes import Bytes
  from fairseq.data.encoders.characters import Characters
  from fairseq.data.encoders.moses_tokenizer import MosesTokenizer
  from fairseq.data.encoders.sentencepiece_bpe import SentencepieceBPE
label_desc: Use image node_id 12 for calling a global function with example usage: main() without return types