<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:14pt;color:#000000;">Hi,<br> I am asking is it possible to have an ARPA LM storing only 3-gram log probabilities?<br> Assuming that in my application (in which I will use the LM), I will only require the probability of these specific 3-grams.<br> example of the LM:<br><br>\data\<br>ngram 1=0<br>ngram 2=0<br>ngram 3=3<br><br>\1-grams:<br><br>\2-grams:<br><br>\3-grams:<br><logprob> <w1 w2 w3><br><logprob> <w4 w5 w6><br><logprob> <w7 w8 w9><br><br>\end\<br><br><br>To say in other words: if I got some method to estimate the probability of some 3-grams needed for 3-gram lattice rescoring for ASR, is it possible to insert the probabilities of these 3-grams in a normal ARPA backoff LM? I did so, but when I tried to normalize the new LM (after adding the new
3-grams), I got the following warinings and the new grams are filtered out!<br><br>warning: no bow for prefix of ngram "w1 w2 w3"<br>.........(lots of the above warinig)<br>BOW numerator for context "w4 w5" is -0.535204 < 0<br>.........(lots of the above warinig)<br><br>could you tell me why this is happening? since if some 3-gram probability is there I will not need to backoff and I will not need to use the lower order grams to get the probability of this specific 3-gram...yes?<br><br>What if I did not normalize the new LM will it be a correct LM or you see some bug, is there some other way to validate the correctness of this LM?<br><br>I will appreciate your help very much.<br><br>Best regards,<br>Amr<br><br><br><div> </div><span style="font-family: arial; color: rgb(191, 0, 191);">Amr Ibrahim El-Desoky, Mousa </span><br style="font-family: arial; color: rgb(191, 0, 191);"><span style="font-family: arial; color: rgb(191, 0, 191);">PhD Student,
Computer Science (i6), </span><br style="font-family: arial; color: rgb(191, 0, 191);"><span style="font-family: arial; color: rgb(191, 0, 191);">RWTH-Aachen University, </span><br style="font-family: arial; color: rgb(191, 0, 191);"><span style="font-family: arial; color: rgb(191, 0, 191);">Aachen, Germany </span><br style="font-family: arial; color: rgb(191, 0, 191);"><span style="font-family: arial; color: rgb(191, 0, 191);">Cel. : +49 0176 56418470 </span><br style="font-family: arial; color: rgb(191, 0, 191);"><span style="font-family: arial; color: rgb(191, 0, 191);">Office : +49 241 8021620 </span><br style="font-family: arial; color: rgb(191, 0, 191);"><span style="font-family: arial; color: rgb(191, 0, 191);">Fax : +49 241 8022219</span><div><br></div>
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