A spectral framework converts KL divergence estimation into least-squares problems and yields closed-form estimators for relative log-densities and divergences from feature moments.
Estimation of entropy and other functionals of a multivariate density.Annals of the Institute of Statistical Mathematics, 41(4):683–697, 1989.(cited on page 54) 17
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A Spectral Framework for Closed-Form Relative Density Estimation
A spectral framework converts KL divergence estimation into least-squares problems and yields closed-form estimators for relative log-densities and divergences from feature moments.