> Hi, > > When I check perplexity on my bigram LM using the debug 2 switch, I find that > when the history word is <unk> then my LM backsoff to the unigram even though > I have a entry for that bigram in the ARPA model. Of course, I want it to be > able to pick up this bigram entry. How do I get it to do this? > > Lambert