Function stdev

examples/llama-bench/llama-bench.cpp:66–74

template<typename T>
static T stdev(const std::vector<T> & v) {
    if (v.size() <= 1) {
        return 0;
    }
    T mean = avg(v);
    T sq_sum = std::inner_product(v.begin(), v.end(), v.begin(), T(0));
    T stdev = std::sqrt(sq_sum / (T)(v.size() - 1) - mean * mean * (T)v.size() / (T)(v.size() - 1));
    return stdev;
}

static std::string get_cpu_info() {
    std::string id;