return metadata;
          }
        }
      }
      break;

    case tensorflow::AttrValue::kPlaceholder:
      metadata.is_list = 0;
      metadata.list_size = -1;
      metadata.type = TF_ATTR_PLACEHOLDER;
      metadata.total_size = -1;
      break;

    case tensorflow::AttrValue::kFunc:
      metadata.is_list = 0;
      metadata.list_size = -1;