code: def registry(region_name, framework=None):
      
      try:
          account_id = image_registry_map[region_name][framework]
          return get_ecr_image_uri_prefix(account_id, region_name)
      except KeyError:
          logging.error("The specific image or region does not exist")
          raise
docs: Return docker registry for the given AWS region for the given framework.
      This is only used for SparkML and Scikit-learn for now.