auto ClusterHistograms(HistogramParams params, const std::vector<Histogram>& in, size_t max_histograms, std::vector<Histogram>* out, std::vector<uint32_t>* histogram_symbols) -> void

auto ClusterHistograms(const HistogramParams params, const std::vector<Histogram>& in, size_t max_histograms, std::vector<Histogram>* out, std::vector<uint32_t>* histogram_symbols) -> void