FW: LM ppl

Andreas Stolcke stolcke at speech.sri.com
Mon Apr 25 21:29:16 PDT 2005

In message <BE8D1FD0.246E%lambert at jhu.edu>you wrote:
> > Hi,
> > 
> > When I check perplexity on my bigram LM using the debug 2 switch, I find th
> at
> > when the history word is <unk> then my LM backsoff to the unigram even thou
> gh
> > 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?

Try using the ngram -unk switch.


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