Latest news: September 06, 2008: Update publication's list (IEICE transaction acceptance). May 23, 2008: Add notes section + early draft for multivariate calculus April 29, 2008: Update publication's list July 31, 2007: Update pyem doc, update publication list. July 13, 2007: Update pyem doc. em is a package which enables to create Gaussian Mixture Models (diagonal and full covariance matrice