[SRILM User List] gtnmin, gtnmax and smoothing methods

[Andreas Stolcke]

On 5/31/2012 10:51 AM, yasser hifny wrote:
> Hello,
> I have a question about related to SRILM implmentation. I found that 
> gtnmin  gtnmax affects some smoothing methods results ( absolute, wb, 
> kn). According to its documentation 
> (http://www.speech.sri.com/projects/srilm/manpages/ngram-discount.7.html) , 
> gtnmin or gtnmax should affect GT  smoothing method only. Can any one 
> explain this strange behavior for me?
gtNmax affects only GT discounting.
gtNminx affects all methods.

This is documented in the ngram-count man page:
>        -gtnmin count
>               where  n  is  1, 2, 3, 4, 5, 6, 7, 8, or 9.  Set the 
> minimal count of N-grams of order n that will be included in the LM.
>               All N-grams with frequency lower than that will 
> effectively be discounted to 0.  If n is omitted  the  parameter  for  N-
>               grams of order > 9 is set.
>               NOTE:  This option affects not only the default 
> Good-Turing discounting but the alternative discounting methods described
>               below as well.
(see the NOTE).

Andreas

> thanks in advance
> best regards,
> Yasser
>
>
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