... non-convex optimization prob-lem for which we invoke a publicly availableconstrained optimization tool, ALGENCAN (An- dreani et al., 2007). To carry out its optimization, ALGENCAN requires ... objective func-tion for 1152 random restarts of MAP-EM with smoothed L0 norm.sity Treebank (Bos et al., 2009). This test set com-prises 21, 878 words annotated with POS tags anda dictionary for each ... HR0011-09-1-0028.ReferencesR. Andreani, E. G. Birgin, J. M. Martnez, and M. L.Schuverdt. 2007. On Augmented Lagrangian meth-ods with general lower-level constraints. SIAMJournal on Optimization, 18:1286–1309.A....