[SRILM User List] Expand class-based LM PPL

[Andreas Stolcke]

Fabian - wrote:
> Hi,
>
> I have a language model interpolated from a class LM and a word LM. If 
> I compute the PPL on my dev set with ngram -classes .. it gives a 
> reasonable PPL, if I expand the interpolated LM and compute the PPL 
> (without the -classes parameter) I get a very high PPL. Can anyone 
> tell me why?
Have you tried expanding the class LM before interpolation, and 
verifying that it has a reasonable PPL ?

Andreas

>
> Best,
> Fabian
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