code: def download_wmt_dataset(
      src_lang="ro", tgt_lang="en", dataset="wmt16", save_dir=None
  ) -> None:
      """Download a dataset using the datasets package and save it to the format expected by finetune.py
      Format of save_dir: train.source, train.target, val.source, val.target, test.source, test.target.
  
      Args:
          src_lang: <str> source language
          tgt_lang: <str> target language
          dataset: <str> wmt16, wmt17, etc. wmt16 is a good start as it's small. To get the full list run `import datasets; print([d.id for d in datasets.list_datasets() if "wmt" in d.id])`
          save_dir: <str>, where to save the datasets, defaults to f'{dataset}-{src_lang}-{tgt_lang}'
  
      Usage:
          >>> download_wmt_dataset('ro', 'en', dataset='wmt16') # saves to wmt16-ro-en
      """
      try:
          import datasets
      except (ModuleNotFoundError, ImportError):
          raise ImportError("run pip install datasets")
      pair = f"{src_lang}-{tgt_lang}"
      print(f"Converting {dataset}-{pair}")
      ds = datasets.load_dataset(dataset, pair)
      if save_dir is None:
          save_dir = f"{dataset}-{pair}"
      save_dir = Path(save_dir)
      save_dir.mkdir(exist_ok=True)
  
      for split in ds.keys():
          print(f"Splitting {split} with {ds[split].num_rows} records")
  
          # to save to val.source, val.target like summary datasets
          fn = "val" if split == "validation" else split
          src_path = save_dir.joinpath(f"{fn}.source")
          tgt_path = save_dir.joinpath(f"{fn}.target")
          src_fp = src_path.open("w+")
          tgt_fp = tgt_path.open("w+")
  
          # reader is the bottleneck so writing one record at a time doesn't slow things down
          for x in tqdm(ds[split]):
              ex = x["translation"]
              src_fp.write(ex[src_lang] + "\n")
              tgt_fp.write(ex[tgt_lang] + "\n")
  
      print(f"Saved {dataset} dataset to {save_dir}")
  
imports: from pathlib import Path
  import fire
  from tqdm import tqdm
label_desc: Use image node_id 1 for calling a global function with example usage: download_wmt_dataset(src_lang, tgt_lang, dataset, save_dir) without return types