code: def build(opt):
      version = "v1.0.0"
      dpath = os.path.join(opt["datapath"], "lightqa")
  
      if not build_data.built(dpath, 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              # An older version exists, so remove these outdated files.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:
              if downloadable_file.url.startswith("/checkpoint"):
                  copyfile(
                      downloadable_file.url,
                      os.path.join(dpath, downloadable_file.file_name),
                  )
              else:
                  downloadable_file.download_file(dpath)
  
          # Mark the data as built.
          build_data.mark_done(dpath, version)
  
imports: from parlai.core.build_data import DownloadableFile
  import parlai.core.build_data
  import os
  from shutil import copyfile
label_desc: Use image node_id 1 for calling a global function with example usage: build(opt) without return types