We include two baseline systems for POS tagging: a classification-based support vector machine (SVM) tagger and a bidirectional maximum entropy Markov model (MEMM) tagger.
we use the L 2 -regularized L 2 -loss SVM implementation in the scikit-learn package (Pedregosa et al., 2011) and L 2 -regularized bidirectional MEMM implementation provided by Stanford CoreNLP (Toutanova et al., 2003;Manning et al., 2014).