[SRILM User List] Expand class-based LM PPL

[Fabian -]

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?
Best,Fabian 		 	   		  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.speech.sri.com/pipermail/srilm-user/attachments/20110209/4ed9fc11/attachment.html>