You are viewing a plain text version of this content. The canonical link for it is here.
Posted to java-user@lucene.apache.org by DES <ma...@2des.de> on 2004/11/17 23:57:05 UTC

Lucene and SVD

Hi

I need some kind of implementation of SVD (singular value decomposition) or 
LSI with Lucene engine. Have anyone any ideas how to create a query table 
for decomposition? The table must have documents as rows and terms as 
columns, if a term is presented in the docuement, the corresponding field 
contains "1" and a "0" if not. Then the SVD will be applied to this table, 
and with first 2 columns docuemnts will be displayed in a 2D-space.
Does anyone work on a project like this?

thank you and excuse for my language skills :)

Anton 


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

Re: Lucene and SVD

Posted by DES <ma...@2des.de>.
>I don't know. Is there a good SVD package for Java?

I think about implementation with Jama, there is a SVD class, but I don't 
know yet if it's good or not 


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

Re: Lucene and SVD

Posted by Paul Elschot <pa...@xs4all.nl>.
On Wednesday 17 November 2004 23:57, DES wrote:
> Hi
> 
> I need some kind of implementation of SVD (singular value decomposition) or 
> LSI with Lucene engine. Have anyone any ideas how to create a query table 
> for decomposition? The table must have documents as rows and terms as 
> columns, if a term is presented in the docuement, the corresponding field 
> contains "1" and a "0" if not. Then the SVD will be applied to this table, 

From Lucene, with TermVector and field norm, one could use the term
density instead of a presence bit.

> and with first 2 columns docuemnts will be displayed in a 2D-space.
> Does anyone work on a project like this?

I don't know. Is there a good SVD package for Java?

Regards,
Paul Elschot


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