Method metric

python_bindings/hnsw_bindings.cpp:148–148

    [[nodiscard]] bool is_built() const { return built_; }
    [[nodiscard]] size_t num_clusters() const { return num_clusters_; }
    [[nodiscard]] std::string metric() const { return metric_to_string(metric_); }

   private:
    HnswIndex() = default;