Reference:
Variational Inference for the Indian Buffet Process
Finale Doshi-Velez, Kurt T. Miller, Jurgen Van Gael, Yee Whye Teh
Technical Report 2009
http://mlg.eng.cam.ac.uk/pub/pdf/DosMilVanTeh09b.pdf
Done:
4 The Finite Variational Approach
5 The Infinite Variational Approach