ITSPACE is a proximal MM method that minimizes the Bures-Wasserstein objective on SPD covariance matrices via monotone closed-form square-root updates with a certificate-gap bound for inexact arithmetic.
arXiv preprint arXiv:2203.06836 , year =
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ITSPACE: Monotone Gaussian Optimal Transport Updates
ITSPACE is a proximal MM method that minimizes the Bures-Wasserstein objective on SPD covariance matrices via monotone closed-form square-root updates with a certificate-gap bound for inexact arithmetic.