[SRILM User List] How to decode with an interpolated class-based LM with lattice-tool

[mvp-songyoung]

Hi,I meet a question when lattice rescoring with an interpolated class-based lm with lattice-tool. This class-based LM was trained by interpolating three other different class-based LMs:LM1 contian 3500 words and merged into 350 clases;LM2 contain 2500 words and merged into 250 classes ; LM3 contian 110 words and merged into 10 classes.  I have renamed the class definitions for three class-based LMs before training and interpolating them.and I also merged the class definitions to a single file before decoding. My decoding comand is as follows:
 
lattice-tool -read-htk -viterbi-decode -order 4 -lm class-4gram.lm -classes <class> -in-lattice-list lattice.scp -htk-wdpenalty $PENALTY -htk-lmscale $LMSCALE
 
But, I found that the decoding process was very slow and memory consuming. I wonder to know why I meet and how to process this situation? Are there any steps I have did incorrect? Please give me the right steps? thank you
                                                                   
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.speech.sri.com/pipermail/srilm-user/attachments/20120514/e05adb51/attachment.html>