Class Language Modelling

Yang Liu yangl at
Tue Nov 12 10:57:37 PST 2002

Hi Geetu,
If your own class definition is alrady in the format of SRILM's
classes-format, then you can easily get the PP using the mixed LMs
(word based and class based) from 'ngram'.
Check the mannual of ngram for details.

I'm not sure if I understand your question correctly.
If this does not help, then please wait for the answers from Andreas.


On Tue, 12 Nov 2002, Geetu Ambwani wrote:

> Hi,
> I am trying to use the SRILM toolkit to calculate perplexity results for
> the following language model - a regular trigram model
> interpolated with the class model P(w0/CW0,CW1,CW2) * P(Cw0/CW1,CW2) where
> CW0,CW1 & CW2 are the equivalence classes for the predicted word and 2 the
> preceding words respectively. I generated the equivalence classifications
> for the words by myself and i want to know if it is possible to use the
> toolkit to do the perplexity measurements if i input the class files as
> data files. Can this be done at all? If any of you know how to do this,
> please reply pointing out the relevant sections of the manual i should
> look up for this.
> Thanks a ton,
> Geetu

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