Hi Vincent,

It is a runtime parameter. It does not necessary match the max phrase of
training.
It also affects how xml-input is handled. If you are using translation
constrains, this parameter has to be set to the maximum number of covered
source words.
I think that the default is set at 20.

Best regards,
Al. Ceausu

On Thu, Mar 31, 2016 at 2:58 PM, Vincent Nguyen <[email protected]> wrote:

> Hello,
>
> Does someone have some support to this (found in the doc) :
>
> Maximum Phrase Length
>
> The maximum length of phrases is limited to 7 words. The maximum phrase
> length impacts the size of the phrase translation table, so shorter
> limits may be desirable, if phrase table size is an issue. Previous
> experiments have shown that performance increases only slightly when
> including phrases of more that 3 words.
>
> Summary
>
>      --max-phrase-length -- maximum length of phrases entered into
> phrase table (default 7)
>
>
> If there is no major improvement above 3, why is the default 7, and is
> there a benchmark somewhere ?
>
>
> Thanks
> Vincent.
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