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On 2/10/2010 9:32 PM, Sun, Xie (MU-Student) wrote:
<blockquote
cite="mid:7526A965F8042A4681330F15B8BA201112A8D3AF@BL2PRD0102MB027.prod.exchangelabs.com"
type="cite">
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<div style="">Dear Dr.<font size="2">Andreas Stolcke,<br>
<span style="font-family: Tahoma;"><br>
Sorry to bother you again. I know this kind of emails make your life
really hard.<br>
</span></font></div>
</div>
</blockquote>
I would appreciate it if you could join the srilm-user mailing list and
ask your questions there.<br>
<br>
<blockquote
cite="mid:7526A965F8042A4681330F15B8BA201112A8D3AF@BL2PRD0102MB027.prod.exchangelabs.com"
type="cite">
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<div style=""><font size="2"><span style="font-family: Tahoma;"> <br>
<span style="font-family: Tahoma;">Right now, I want to train a
class-based model and then come back with the word model. So I use (1),
(2) and (3) to create the class model. In (4), I want to replace
classes with words and generate the trigram word model.
</span>I am wondering if the commands below are correct:<br>
<span style="font-family: Tahoma;"><br>
</span></span></font>
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<p class="MsoNormal"><font style="font-family: Tahoma;" size="2">(1)
ngram-class –vocab dict<span style="">
</span>-tolower <span style=""> </span>–text<span style=""> </span>textfile
<span style=""> </span>–numclasses<span style=""> </span>5<span
style=""> </span>-classes classfile</font><br>
</p>
(2) replace-words-with-classes <span style=""> </span>classes=classfile<span
style="">
</span>textfile <span style=""> </span>><span style=""> </span>output_text_with_classes<br>
<br>
<font size="2"><span style="font-family: Tahoma;"><span
style="font-family: Tahoma;"></span>(3) ngram-count -tolower -text
</span></font>output_text_with_classes -lm class_based_model<br>
<font size="2"><span style="font-family: Tahoma;"><br>
<span style="font-family: Tahoma;">(4) ngram -lm </span></span></font>class_based_model
-classes classfile -expand-classes 3 -write-lm
output_trigram_word_model<br>
<font size="2"><span style="font-family: Tahoma;"><br>
<span style="font-family: Tahoma;"></span>Everytime I tried this, I
always get an error as below:<br>
<span style="font-family: Tahoma;"><br>
<span style="font-family: Tahoma;">assertion "body !=0" failed: file
"../../include/LHash.cc", line 138<br>
<span style="font-family: Tahoma;"><br>
<span style="font-family: Tahoma;">Before this error happened, I
observed that the memory occupancy could be around 2G. But I have 4G
memory for my computer. So I don't know what's wrong. Could you give me
some idea? I will really appreciate your help.<br>
</span></span></span></span></span></font></div>
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You are running out of memory. That's because -expand-classes can be
very memory intensive.<br>
Even if you have 4GB our operating system might only support up to 2GB
if you are using 32bit pointers. You might have to compile SRILM for
64bit pointers. But even that is no guarantee that you will have
enough memory.<br>
<br>
You could try pruning the class LM first and then expand. By choosing
different pruning thresholds you can get a feel for the growth of the
expanded model as a function of the class LM.<br>
<br>
Andreas<br>
<br>
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<span style="font-family: Tahoma;">Thanks,<br>
<span style="font-family: Tahoma;"><br>
<span style="font-family: Tahoma;">Xie</span><br>
</span></span></span></span></span></span></span></span></font><font
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<hr tabindex="-1"><font color="#000000" face="Tahoma" size="2"><b>From:</b>
Andreas Stolcke [<a class="moz-txt-link-abbreviated" href="mailto:stolcke@speech.sri.com">stolcke@speech.sri.com</a>]<br>
<b>Sent:</b> Thursday, February 04, 2010 5:15 PM<br>
<b>To:</b> Sun, Xie (MU-Student)<br>
<b>Cc:</b> srilm-user<br>
<b>Subject:</b> Re: a question about srilm<br>
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<div>On 2/3/2010 9:18 PM, Sun, Xie (MU-Student) wrote:
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<div style=""> Dear Dr.<font size="2">Andreas Stolcke,<br>
<span style="font-family: Tahoma;"><br>
<span style="font-family: Tahoma;">I am PhD student from University
of Missouri. My name is Xie Sun. Right now I am using the SRILM toolkit
to train a language model. I want to use the model adaptation function.
I am using the command as below:<br>
<span style="font-family: Tahoma;"><br>
ngram -lm main_model -adapt-marginals model_adapted -base-marginals
unigram_model -ppl test_file<br>
<span style="font-family: Tahoma;"><br>
<span style="font-family: Tahoma;">where the unigram_model is
coming from the main_model and model_adapted is the mode I want to
adapt.<br>
</span></span></span></span></span></font></div>
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I'm assuming model_adapted refers to the marginals of the adaptation
data. Then this command is correct.<br>
Note that -base-marginals needs to be specified only if the unadapted
unigrams are different from the unigrams in main_model.<br>
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<span style="font-family: Tahoma;">I am not sure if what I did is
correct. Besides, one more important question is how I can output the
adapted model. I used the option -write-lm. But it does not work. Could
you give me some hints? I will really appreciate your help.<br>
</span></span></span></span></span></span></span></font></div>
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The AdaptMarginals does not support -write-lm at this point. It should
be very slow as you'd have to compute the normalization for every
context appearing in the LM.<br>
You can simulate the effect of -write-lm by employing the
-rescore-ngram option:<br>
<br>
ngram -lm -main_model -adapt-marginals ... -rescore-ngram main_model
write-lm new_model
<br>
<br>
Again, this will take a very long time for regular-sized LMs.<br>
<br>
Andreas<br>
<br>
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