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	Divergenza di Kullback-Leibler	Distanza di Hellinger
Campo	Processo decisionale	Processo decisionale
Famiglia	MCDM	MCDM
Anno di origine	1951	1909
Ideatore	Solomon Kullback and Richard Leibler	Ernst Hellinger
Tipo	Asymmetric probability distribution dissimilarity	Symmetric metric for probability distributions
Fonte seminale	Kullback, S., & Leibler, R. A. (1951). On information and sufficiency. Annals of Mathematical Statistics, 22(1), 79-86.	Hellinger, E. (1909). Neue Begründung der Theorie quadratischer Formen von unendlichvielen Veränderlichen. Journal für die Reine und Angewandte Mathematik, 136, 210-271.
Alias	KL divergence, relative entropy, information divergence	Bhattacharyya distance, Hellinger metric
Correlati	2	2
Sintesi	Kullback-Leibler divergence, also called relative entropy or information divergence, measures the asymmetric difference between two probability distributions. Introduced by Solomon Kullback and Richard Leibler in 1951, this information-theoretic measure quantifies how one probability distribution diverges from a reference distribution, ranging from 0 (identical distributions) to infinity. It is foundational in information theory, machine learning, and decision-making with probabilistic frameworks.	Hellinger distance is a symmetric, bounded metric that measures the difference between two probability distributions. Rooted in the work of Ernst Hellinger (1909) and later formalized in statistical divergence by Anil Bhattacharyya (1946), this distance ranges from 0 (identical distributions) to 1. It is a true metric satisfying all mathematical distance properties and is particularly well-suited for comparing probability distributions in a symmetric, numerically stable manner.