[SRILM User List] different perplexity

[Md. Akmal Haidar]

Hi,

i faced a problem in perplexity calculation..
when i used the commands: 1) ngram -lm l1.lm -ppl t.txt 
                                          2) ngram -lm l2.lm -lambda 0 -mix-lm l1.lm -ppl  t.txt

the first gives lowest perplexity that the second one. 
Should the above commands give the different perplexity?

thanks

Akmal


      
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.speech.sri.com/pipermail/srilm-user/attachments/20090828/8b56ec0a/attachment.html>