Diana,
Here's an abstract from SRILM manpages on ngram:
"Perplexity is given with two different
normalizations: counting all input tokens (``ppl'')
and excluding end-of-sentence tags (``ppl1'')."
--- Diana Durán <dianaduraiz at ADDRESS HIDDEN> wrote:
> Hello,
>
> I would like to know what the difference is between
> ppl and ppll at the
> output file when executing ngram.
>
> Thank you.
>
best regards,
Ilya
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