code: def mono_main(args):
      lang = args.mono_lang
      if args.dataset.lower() == "newscrawl":
          if lang == "de":
              train_src_paths = download_mono_newscrawl(
                  "de", args.cache_path
              )
          else:
              raise NotImplementedError
      else:
          raise NotImplementedError
      if args.mode == "path_only":
          print("Dataset: {}/{}".format(args.dataset, args.mono_lang))
          print("Train Source:")
          for path in train_src_paths:
              print("\t{}".format(path))
      elif args.mode == "raw":
          assert args.save_path is not None
          if not os.path.exists(args.save_path):
              os.makedirs(args.save_path)
          print("Save to {}".format(args.save_path))
          raw_src_path = os.path.join(
              args.save_path, "{}.{}".format(args.prefix, lang)
          )
          if not os.path.exists(raw_src_path) or args.overwrite:
              with open(raw_src_path, "wb") as out_f:
                  for ele_path in train_src_paths:
                      with open(ele_path, "rb") as in_f:
                          shutil.copyfileobj(in_f, out_f)
      else:
          raise NotImplementedError
  
imports: from typing import List, Union, IO, AnyStr, Tuple, Optional
  import re
  import os
  import argparse
  import zipfile
  import shutil
  import functools
  import tarfile
  import gzip
  import json
  from xml.etree import ElementTree
  from gluonnlp.data.filtering import ProfanityFilter
  from gluonnlp.utils.misc import file_line_number, download, load_checksum_stats
  from gluonnlp.base import get_data_home_dir, get_repo_url
label_desc: Use image node_id 18 for calling a global function with example usage: mono_main(args) without return types