code: def build(opt):
      dpath = os.path.join(opt["datapath"], "NaturalQuestionsOpen")
      version = str(VERSION)
  
      if not build_data.built(dpath, version_string=version):
          print("[building data: " + dpath + "]")
          if build_data.built(dpath):
              # An older version exists, so remove these outdated files.
              build_data.remove_dir(dpath)
          build_data.make_dir(dpath)
  
          # Download the data.
          for downloadable_file in RESOURCES:
              downloadable_file.download_file(dpath)
              if ".gz" in downloadable_file.file_name:
                  with gzip.open(
                      os.path.join(dpath, downloadable_file.file_name),
                      "rb",
                  ) as fin:
                      with open(
                          os.path.join(
                              dpath, downloadable_file.file_name[:-3]
                          ),
                          "wb",
                      ) as fout:
                          shutil.copyfileobj(fin, fout)
  
          # Mark the data as built.
          build_data.mark_done(dpath, version_string=version)
  
imports: import parlai.core.build_data
  import os
  from parlai.core.build_data import DownloadableFile
  import gzip
  import shutil
label_desc: Use image node_id 1 for calling a global function with example usage: build(opt) without return types