Models to be implemented: - [clustering processes](https://arxiv.org/abs/1901.00409) - [centered partition processes](https://projecteuclid.org/journals/bayesian-analysis/volume-16/issue-1/Centered-Partition-Processes-Informative-Priors-for-Clustering-with-Discussion/10.1214/20-BA1197.full) - recent NP developments
