Cache covariance inverses and log-determinants

Adds invSigma and logdet to a parameter list.

init_cov_cache_fast(params, jitter = 0)

Arguments

params

A list with at least pi and sigma, where sigma is a list of covariance matrices.

jitter

Nonnegative diagonal jitter added if Cholesky fails.

Value

Updated params list with invSigma and logdet.