code: def delete_model(args: argparse.Namespace, backend: StorageBackend, log: logging.Logger):
      
      try:
          meta = backend.index.remove_model(args.input)
          template_readme = backend.index.load_template(args.template_readme)
          backend.index.update_readme(template_readme)
      except ValueError:
          return 1
      backend.delete_model(meta)
      log.info("Updating the models index...")
      try:
          backend.index.upload("delete", meta)
      except ValueError:  # TODO: replace with PorcelainError
          return 1
      log.info("Successfully deleted.")
docs: Delete a model.
  
      :param args: :class:`argparse.Namespace` with "input", "backend", "args", "meta", \
                          "update_default", "username", "password", "remote_repo", \
                          "template_model", "template_readme" and "log_level".
      :param backend: Backend which is responsible for working with model files.
      :param log: Logger supplied by supply_backend
      :return: None