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f-divergence
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<p> In <a href="/facts/Probability_theory/mFBn51rE">probability theory</a>, an f {\displaystyle f} -divergence is a certain type of function D f ( P ‖ Q ) {\displaystyle D_{f}(P\|Q)} that measures the difference between two <a href="/facts/Probability_distributions/EpsKKVRu">probability distributions</a> P {\displaystyle P} and Q {\displaystyle Q} . Many common divergences, such as <a href="/facts/KL-divergence/nh7SjlPE">KL-divergence</a>, <a href="/facts/Hellinger_distance/nmIlcIGn">Hellinger distance</a>, and <a href="/facts/Total_variation_distance/agdAvDuW">total variation distance</a>, are special cases of f {\displaystyle f} -divergence. </p>