code: def build(opt):
      dpath = os.path.join(opt["datapath"], CONST.DATASET_NAME)
      version = "1.0"
      if not build_data.built(dpath, version):
          logging.info(
              f"[building data: {dpath}]\nThis may take a while but only heppens once."
          )
          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              # An older version exists, so remove these outdated files.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.
          DATASET_FILE.download_file(dpath)
          logging.info(
              "Finished downloading dataset files successfully."
          )
  
          build_data.mark_done(dpath, version)
  
imports: import os
  import parlai.core.build_data
  import parlai.utils.logging
  import parlai.tasks.wizard_of_internet.constants
label_desc: Use image node_id 1 for calling a global function with example usage: build(opt) without return types