We found that the oldest system ( Brown et al. , 1992 ) yielded the best prototypes , and that using these prototypes gave state-of-the-art performance on WSJ , as well as improvements on nearly all of the non-English corpora .
classbased ngram models of natural language
Peter F Brown Vincent J Della Pietra Peter V Desouza Jennifer C Lai Robert L Mercer
Finally , we introduced the idea of evaluating induction systems based on their ability to produce useful cluster prototypes . We found that the oldest system ( Brown et al. , 1992 ) yielded the best prototypes , and that using these prototypes gave state-of-the-art performance on WSJ , as well as improvements on nearly all of the non-English corpora . These promising results suggest a new direction for future research : improving POS induction by developing methods targeted towards extracting better prototypes , rather than focusing on improving clustering of the entire data set .
We found that the oldest system ( @@CITATION ) yielded the best prototypes , and that using these prototypes gave state-of-the-art performance on WSJ , as well as improvements on nearly all of the non-English corpora .