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Posted to java-user@lucene.apache.org by jreeman <mi...@hotmail.com> on 2007/03/02 14:49:23 UTC
Re: [ANN] Overriding Similarity
Hello
The original message explaining why I wanted to overide DefaultSimilarity is
here :
http://www.nabble.com/forum/ViewPost.jtp?post=9268781&framed=y
http://www.nabble.com/forum/ViewPost.jtp?post=9268781&framed=y
Si I overided DefaultSimilarity like this :
package org.apache.lenya.lucene.index;
import org.apache.lucene.search.DefaultSimilarity;
public class PersonalSimilarity extends DefaultSimilarity {
public float idf(int docFreq, int numDocs)
{
return 1;
}
}
And I use it like this :
PersonalSimilarity ds = new PersonalSimilarity();
searcher.setSimilarity(ds);
After that, all the hit have the same score.
But my new question is : do I need to use this PersonalSimilarity for the
IndexWriter because currently it yet works fine only in the Searcher.
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Re: [ANN] Overriding Similarity
Posted by jreeman <mi...@hotmail.com>.
> If you modify all scores to 100%, why can't you just ignore them?
Because in this case only, the scores will be all 100% but in other case
not. The fact is I don't want the the score depends on the frequency. I
don't want this "smart" feature.
> Anyhow, if all you want to modify is idf(), using the modified similarity
class only at search time is ok. For further pointers and explanations take
a look at http://lucene.apache.org/java/docs/scoring.html
thanks a lot.
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Re: [ANN] Overriding Similarity
Posted by Doron Cohen <DO...@il.ibm.com>.
If you modify all scores to 100%, why can't you just ignore them?
Anyhow, if all you want to modify is idf(), using the modified similarity
class only at search time is ok. For further pointers and explanations take
a look at http://lucene.apache.org/java/docs/scoring.html
Regards,
Doron
jreeman <mi...@hotmail.com> wrote on 02/03/2007 05:49:23:
>
> Hello
>
> The original message explaining why I wanted to overide DefaultSimilarity
is
> here :
>
> http://www.nabble.com/forum/ViewPost.jtp?post=9268781&framed=y
> http://www.nabble.com/forum/ViewPost.jtp?post=9268781&framed=y
>
> Si I overided DefaultSimilarity like this :
>
> package org.apache.lenya.lucene.index;
>
> import org.apache.lucene.search.DefaultSimilarity;
>
> public class PersonalSimilarity extends DefaultSimilarity {
> public float idf(int docFreq, int numDocs)
> {
> return 1;
> }
>
> }
>
> And I use it like this :
>
> PersonalSimilarity ds = new PersonalSimilarity();
> searcher.setSimilarity(ds);
>
> After that, all the hit have the same score.
>
> But my new question is : do I need to use this PersonalSimilarity for the
> IndexWriter because currently it yet works fine only in the Searcher.
>
> --
> View this message in context: http://www.nabble.com/Overriding-
> Similarity-tf2128934.html#a9269838
> Sent from the Lucene - Java Users mailing list archive at Nabble.com.
>
>
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> 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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