MultivariateNormal parameter confusion

Currently sifting through the documentation, and I’m a little confused about the parameters of MultivariateNormalDiagPlusLowRank.

Typically, multivariate normals with low rank covariances are represented as follows

image

It looks like that is what this class is doing - but I’m a little confused by the parameter names.

Let me try to guess wha the parameters are

mu = loc
U = scale_perturb_factor
Lambda = scale_perturb_diag
sigma * I = scale_diag

Is that correct?

But then, what is scale_identity_multiplier?

EDIT: The link in question is here . Thanks for clarifying @gfeldman

P.S. The MathJax support in Discourse is pretty awesome - it would be really cool see that enabled here :slight_smile: