1. Yee Whye Teh is Lee Kuan Yew Postdoctoral Fellow, Department of Computer Science, National University of Singapore, Singapore . Michael I. Jordan is Professor of Electrical Engineering and Computer Science and Professor of Statistics, University of California, Berkeley, CA 94720 . Matthew J. Beal is Assistant Professor of Computer Science and Engineering, SUNY Buffalo, Buffalo, NY 14260 . David M. Blei is Assistant Professor of Computer Science, Princeton University, Princeton, NJ . Correspondence...