Scoring scheme modification

[Hendra Setiawan <pa...@yahoo.com>]

I am working on assignment about passage retrieval. I need to change the current scoring scheme (tf.idf.norm.etc..) especially removing normalization part. I tried to extends Similarity, but it always came out with normalization. 
 
Do I have to change the code of Scorer class for every query ? Or is there more elegant way ?
 


---------------------------------
Do you Yahoo!?
The New Yahoo! Shopping - with improved product search

Re: Scoring scheme modification

[Brisbart Franck <Fr...@kelkoo.net>]

No, there's no need to change any Scorer class. You just have to extend 
the Similarity class.
About the normalization, the norm factors are computed during the 
indexation step and store in the index. If you keep using the same index 
(I mean an index created using the default Similarity), you still have 
the old norm factors computed with the 'norm' method of the default 
Similarity.
So, don't forget to re-index after changing the Similarity.
I hope this helps.

Franck

Hendra Setiawan wrote:
> I am working on assignment about passage retrieval. I need to change the current scoring scheme (tf.idf.norm.etc..) especially removing normalization part. I tried to extends Similarity, but it always came out with normalization. 
>  
> Do I have to change the code of Scorer class for every query ? Or is there more elegant way ?
>  
> 
> 
> ---------------------------------
> Do you Yahoo!?
> The New Yahoo! Shopping - with improved product search



-- 
Franck Brisbart
http://www.kelkoo.com


---------------------------------------------------------------------
To unsubscribe, e-mail: lucene-dev-unsubscribe@jakarta.apache.org
For additional commands, e-mail: lucene-dev-help@jakarta.apache.org