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Estimating the Arc Length of the Optimal ROC Curve and Lower Bounding the Maximal AUC. (arXiv:2110.09651v2 [math.ST] UPDATED)
June 3, 2022, 1:11 a.m. | Song Liu
stat.ML updates on arXiv.org arxiv.org
We show that when the data likelihood ratio is used as the score function,
the arc length of the corresponding ROC curve gives rise to a novel
$f$-divergence which measures differences between the positive and negative
data distributions. This $f$-divergence can be expressed using a variational
objective and estimated only using samples from the positive and negative
\emph{data} distributions. We show the empirical version of this variational
objective is also a consistent estimator for the arctangent likelihood ratio
with a …
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