This was done because purely unsupervised techniques ( e.g. , Baum-Welch [ Baum and Petrie 1966 ] or Brill 's [ Brill 1995b ] ) enable regularities to be induced for word classes which contain many entries , exploiting the fact that individual words that belong to a POS class occur in different ambiguity patterns .
statistical inference for probabilistic functions of finite markov chains
Leonard E Baum Ted Petrie
We also used our DCA system to assign capitalized words , abbreviations , and sentence breaks , retaining only cases assigned by the strategies with an accuracy not less than 99.8 % . This was done because purely unsupervised techniques ( e.g. , Baum-Welch [ Baum and Petrie 1966 ] or Brill 's [ Brill 1995b ] ) enable regularities to be induced for word classes which contain many entries , exploiting the fact that individual words that belong to a POS class occur in different ambiguity patterns . Counting all possible POS combinations in these ambiguity patterns over multiple patterns usually produces the right combinations as the most frequent .
This was done because purely unsupervised techniques ( e.g. , Baum-Welch [ @@CITATION ] or Brill 's [ Brill 1995b ] ) enable regularities to be induced for word classes which contain many entries , exploiting the fact that individual words that belong to a POS class occur in different ambiguity patterns .