code: def _concat_files(in_paths: List[str], out_path: str):
      with open(out_path, "w") as f_o:
          for p in in_paths:
              with open(p) as f:
                  for r in f:
                      f_o.write(r)
  
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 10 for calling a global function with example usage: _concat_files(in_paths, out_path) without return types