CRFs with SC 3 CRFs with SC + VSD 4 CRFs with SC+VSD+ Dict 5 CRFs with SC+ VSD+ Dict + ERS 6 CRFs with SC+ VSD + Dict + ERS + Misc 7 SVMs with SC 8 SVMs with SC+VSD 9 SVMs with SC+ VSD+ Dict For evaluating in each experiment, we used 5-fold cross-validation test.
we randomly divide the corpus into five partitions; in each fold we take one partition as the testing set and all the others for training.