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Change the variance computation (#319)

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Angelos Katharopoulos 2024-01-30 19:28:56 -08:00 committed by GitHub
parent 0de5988f92
commit 199aebcf77
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1 changed files with 11 additions and 4 deletions
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15
mlx/ops.cpp
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@ -1337,11 +1337,18 @@ array var(
bool keepdims /* = false */, bool keepdims /* = false */,
int ddof /* = 0*/, int ddof /* = 0*/,
StreamOrDevice s /* = {}*/) { StreamOrDevice s /* = {}*/) {
auto nelements = compute_number_of_elements(a, axes);
auto dtype = at_least_float(a.dtype()); auto dtype = at_least_float(a.dtype());
auto mu = mean(a, axes, true, s); auto mu2 = square(mean(a, axes, keepdims, s), s);
auto S = sum(square(subtract(a, mu, s), s), axes, keepdims, s); auto a2 = mean(square(a, s), axes, keepdims, s);
return multiply(S, array(1.0 / (nelements - ddof), dtype), s); auto v = subtract(a2, mu2, s);
if (ddof != 0) {
auto nelements = compute_number_of_elements(a, axes);
float factor = nelements / (nelements - ddof);
v = multiply(v, array(factor, dtype), s);
}
return v;
} }
array var( array var(