Graphical Model for Recommender Systems
web.media.mit.edu/~pernghwa/papers/poissonfm.pdf https://github.com/blei-lab/publications/blob/4a002eac1613c8ce4982d0dc7ae119029a42bde5/2015_CharlinRanganathMcInerneyBlei/README.md https://github.com/blei-lab Nonparametric Poisson Factorization Machine: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7373420&tag=1
negative-binomial matrix factorization https://github.com/dawenl/nbmf/blob/master/code/nbmf.py
Kalman Filter http://link.springer.com/article/10.1186/1687-1847-2012-172#Abs1
https://www.cs.princeton.edu/~blei/topicmodeling.html
Stochastic gradient descent https://en.wikipedia.org/wiki/Stochastic_gradient_descent