vbatts/llama.cpp
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add Bessel's correction to stdev calculation

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Co-authored-by: Johannes Gäßler <johannesg@5d6.de>
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slaren 2023-08-16 00:25:59 +02:00 • committed by GitHub
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examples/llama-bench/llama-bench.cpp
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@ -63,7 +63,7 @@ T stddev(const std::vector<T>& v) {
} }
T mean = avg(v); T mean = avg(v);
T sq_sum = std::inner_product(v.begin(), v.end(), v.begin(), T(0)); T sq_sum = std::inner_product(v.begin(), v.end(), v.begin(), T(0));
T stdev = std::sqrt(sq_sum / (T)v.size() - mean * mean); T stdev = std::sqrt(sq_sum / (T)(v.size() - 1) - mean * mean * (T)v.size() / (T)(v.size() - 1));
return stdev; return stdev;
} }