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expected_loglik takes a Vector y, a Vector q_f, and a lik function that maps from scalar f to UnivariateDistribution; expected_loglik then does the broadcasting internally. Is that what we want?
Would it be better (cleaner) to have expected_loglik handle scalars only (but this might result in some performance loss for e.g. recomputing the Gauss-Hermite points and weights for each data point)?
Should we expect lik to take the full Vector fs and return e.g. a Product() of UnivariateDistributions (though this might make the expectation code more complicated)?
How would we want to handle the heteroskedastic case, where we do want to include the correlations across the two outputs at each data point, but independence between different data points (not sure how we would handle that on the AbstractGPs side given that multi-output is all "output as input")?
Could extend it so you can directly pass a FiniteGP as follows:
Open question from #42:
Could extend it so you can directly pass a
FiniteGP
as follows:Would have to think how to handle likelihoods depending on multiple function evaluations (e.g. heteroskedastic likelihood with a vector-valued GP).
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