lucene-java-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Marc Sturlese <marc.sturl...@gmail.com>
Subject Re: boost and score doubt
Date Tue, 07 Apr 2009 09:48:03 GMT

That was my problem... I was ommiting norms, so the boost I gave at the
document at index time was not taking effect.
Since I stop omitting them results have changed completely.
Thanks!


Michael McCandless-2 wrote:
> 
> Negative boosts are accepted, though rather "unusual".  Also note that
> Lucene by default filters out any hits with scores <= 0.0.
> 
> Normally you'd set boost to something > 0.0 (0.1 should work).
> 
> What unexpected effect are you seeing?
> 
> If you omit norms, then indeed your per-doc boost (and per-field
> boost, if used) are discarded (have no effect).
> 
> Mike
> 
> On Mon, Apr 6, 2009 at 4:01 PM, Marc Sturlese <marc.sturlese@gmail.com>
> wrote:
>>
>> Hey there,
>> Does de function doc.setBoost(x.y) accept negative values or values minor
>> than 1?? I mean... it compile and doesn't give errors but the behabiour
>> is
>> not exactly what I was expecting.
>> In my use case I have the field title... I want to give very very low
>> relevance to the documents witch title has less that 40 characters. I
>> have
>> tried setting boost to negatives values or to 0.1
>> Wich is the best way to do that?
>> Is there any range of values for setting boost?
>>
>> And another thing that confuses me...  if I omit norms is the score
>> function... how does it affect to the boosting I am setting? does it
>> loose
>> the effect?
>>
>> Thanks in advance!
>> --
>> View this message in context:
>> http://www.nabble.com/boost-and-score-doubt-tp22916108p22916108.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
>>
>>
> 
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
> 
> 
> 

-- 
View this message in context: http://www.nabble.com/boost-and-score-doubt-tp22916108p22925764.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


Mime
View raw message