Function scalar_quantize

include/rabitqlib/utils/space.hpp:199–204

    for (size_t i = 0; i < num_points; ++i) {
        auto tid = omp_get_thread_num();
        AnnCandidate<T, PID>& cur_entry = best_entries[tid];
        const T* cur_data = data + (dim * i);

        T distance = dist_func(cur_data, query, dim);
        if (distance < cur_entry.distance) {
            cur_entry.id = static_cast<PID>(i);
            cur_entry.distance = distance;
        }
    }