Department of Statistics, Machine Learning Department, and Center for the Neural Basis of Cognition, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America.|Department of Biostatistics, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, United States of America.|Department of Statistics, North Carolina State University, Raleigh, North Carolina, United States of America.|Department of Statistics, Harvard University, Cambridge, Massachusetts, United States of America.|Department of Statistics and Department of Electrical Engineering and Computer Science, University of California Berkeley, Berkeley, California, United States of America.|Department of Statistical Sciences, University of Toronto, Toronto, Ontario, Canada.