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missing counts

From: Mirjam Sepesy Maucec <mirjam.sepesy at ADDRESS HIDDEN>
Date: Wed, 18 Dec 2002 13:58:41 +0100

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Hi,

I have the following problem.

The n-gram counts are computed from raw text corpus by using
'ngram-count' and  'ngram-merge'.
I experiment with different vocabularies and bigram and trigram models.
In each experiment I run again 'ngram-count -vocab -order' and make the
language model with ' make-big-lm -trust-totals'.
I test language models on my test set and noticed some mistakes. Some
bigrams, which are present in the bigram model get lost in the trigram
model. When I omit the -trust-totals option, the results are OK.
Why should I not trust the totals in my case?  Are the counts of
different orders made by 'ngram-count' and  'ngram-merge' not in line?

Regards,

Mirjam.

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