> 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
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