tf.contrib.distributions.normal_congugates_known_sigma_predictive(prior, sigma, s, n)
Posterior predictive Normal distribution w. conjugate prior on the mean.
This model assumes that n observations (with sum s) come from a Normal with unknown mean mu (described by the Normal prior) and known variance sigma^2. The "known sigma predictive" is the distribution of new observations, conditioned on the existing observations and our prior.
Accepts a prior Normal distribution object, having parameters