Function combine_error_stats

examples/quantize-stats/quantize-stats.cpp:97–102

}

static void combine_error_stats(error_stats & into, const error_stats & from) {
    into.num_samples += from.num_samples;
    into.total_error += from.total_error;
    if (from.max_error > into.max_error) into.max_error = from.max_error;
    for (size_t i=0; i<HISTOGRAM_BUCKETS; ++i) into.error_histogram[i] += from.error_histogram[i];
}

static double find_quantile(const error_stats & stats, double quantile) {
    double sum = std::accumulate(std::begin(stats.error_histogram), std::end(stats.error_histogram), 0.0);