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f-divergence

{title2=$\chi^2(P\Vert Q)$}
{wiki}

For <probability mass functions> $P,Q$ with $P$ absolutely continuous with respect to $Q$,
$$
\chi^2(P\Vert Q)=\sum_x\frac{(P(x)-Q(x))^2}{Q(x)}.
$$

Chi-squared divergence

Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 224 / 3 / c / Solution

Chi-squared divergence ( $χ^{2} (P ∥ Q)$ )

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Chi-squared divergence (χ2(P∥Q))

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