RuntimeBuilder(const RuntimeBuilder&) = delete;
  RuntimeBuilder& operator=(const RuntimeBuilder&) = delete;

  struct TFEContextOptionsDeleter {
    void operator()(TFE_ContextOptions* p) const {
      TFE_DeleteContextOptions(p);
    }
  };
  std::unique_ptr<TFE_ContextOptions, TFEContextOptionsDeleter> options_;
};

inline RuntimeBuilder& RuntimeBuilder::SetUseTFRT(bool use_tfrt) {