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Use metric sample for probing

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Closed Philipp Frank requested to merge geomap_pf into geomap Oct 29, 2022
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Approximates tr(log(M)) using tr(log(T)) where T is the projection of M into the krylov subspace K(M, v) where v is a sample from the metric M (i.E. v = v_lh + v_pr where v_lh/v_pr are samples from the likelihood/prior metric, respectively. In addition, the projected sample is constructed by taking v_pr projecting out the subspace K(M,v) using its eigen-basis. This ensures that both, the prior dominated part of v and the part already covered by tr(log(T)) is projected out.

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Source branch: geomap_pf