std::string& custom_option_buffer) {
  flexbuffers::Builder fbb;
  size_t start_map = fbb.StartMap();

  if (failed(AddIntAttr(func, attrs, "max_detections", &fbb)) ||
      failed(AddIntAttr(func, attrs, "max_classes_per_detection", &fbb)) ||
      failed(AddIntAttr(func, attrs, "num_classes", &fbb)) ||
      failed(AddFloatAttr(func, attrs, "nms_score_threshold", &fbb)) ||
      failed(AddFloatAttr(func, attrs, "nms_iou_threshold", &fbb)) ||