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math.ST updates on arXiv.org

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Maximum a posteriori estimators in $\ell^p$ are well-defined for diagonal Gaussian priors
Ilja Klebanov, Philipp Wacker · 2022-07-02 · via math.ST updates on arXiv.org

We prove that maximum a posteriori estimators are well-defined for diagonal Gaussian priors $μ$ on $\ell^p$ under common assumptions on the potential $Φ$. Further, we show connections to the Onsager--Machlup functional and provide a corrected and strongly simplified proof in the Hilbert space case $p=2$, previously established by Dashti et al (2013) and Kretschmann (2019). These corrections do not generalize to the setting $1 \leq p < \infty$, which requires a novel convexification result for the difference between the Cameron--Martin norm and the $p$-norm.

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