Since we are not generating from the model , this does not introduce difficulties ( Klein and Manning , 2002 ) .
a generative constituentcontext model for improved grammar induction
Dan Klein Christopher D Manning
Like CCM , this model is deficient since the same supertags are generated multiple times , and parses with conflicting supertags are not valid . Since we are not generating from the model , this does not introduce difficulties ( Klein and Manning , 2002 ) . One additional complication that must be addressed is that left-frontier non-terminal categories -- those whose subtree span includes the first word of the sentence -- do not have a left-side supertag to use as context .
Since we are not generating from the model , this does not introduce difficulties ( @@CITATION ) .