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Posted to java-user@lucene.apache.org by blazingwolf7 <bl...@gmail.com> on 2008/08/19 04:44:04 UTC
Score Boosting
Hi,
I am currently working on the calculation of score part in Lucene. And I
encounter a part that I do not understand.
return raw * Similarity.decodeNorm(norms[doc]); // normalize for field
As can be seen from the code above, the Similarity method decodeNorm() will
be called to decode the byte formatted value to change it back into float
value. This value actually represent the normalization value for the fields;
title, url, content, host and anchor.
I would like to know how it actually select the field to be included in the
calculation. When I print out the value, I noticed only one of the field
will be selected. Can anyone advise me on this? How the field is selected,
and why not all the field is used in the calculation?
Thanks
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Re: Score Boosting
Posted by Grant Ingersoll <gs...@apache.org>.
Normalization is done on a field by field basis, as is most scoring.
It doesn't factor all fields in, b/c someone might not be querying all
fields. The field it does use is based on the query.
On Aug 18, 2008, at 10:44 PM, blazingwolf7 wrote:
>
> Hi,
>
> I am currently working on the calculation of score part in Lucene.
> And I
> encounter a part that I do not understand.
> return raw * Similarity.decodeNorm(norms[doc]); // normalize for
> field
>
> As can be seen from the code above, the Similarity method
> decodeNorm() will
> be called to decode the byte formatted value to change it back into
> float
> value. This value actually represent the normalization value for the
> fields;
> title, url, content, host and anchor.
>
> I would like to know how it actually select the field to be included
> in the
> calculation. When I print out the value, I noticed only one of the
> field
> will be selected. Can anyone advise me on this? How the field is
> selected,
> and why not all the field is used in the calculation?
>
> Thanks
> --
> View this message in context: http://www.nabble.com/Score-Boosting-tp19043489p19043489.html
> Sent from the Lucene - Java Users mailing list archive at Nabble.com.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
>
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