code: def _convert_to_bchar(
      in_path_prefix: str, src: str, tgt: str, out_path: str
  ):
      with open(out_path, "w") as f_o:
          for lang in [src, tgt]:
              with open(f"{in_path_prefix}.{lang}") as f:
                  for s in f:
                      f_o.write(byte_encode(s.strip()) + "\n")
  
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 6 for calling a global function with example usage: _convert_to_bchar(in_path_prefix, src, tgt, out_path) without return types