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From "Edward J. Yoon" <edwardy...@apache.org>
Subject Re: using hama in gsoc
Date Thu, 24 Jul 2008 00:59:33 GMT
We need discriminant function and inverse operation.

See http://en.wikipedia.org/wiki/Invertible_matrix (especially,
Analytic solution and Blockwise inversion Part)

- Edward

On 7/24/08, Vaijanath N. Rao <vaiju1981@gmail.com> wrote:
> Hi Edward and Chanwit,
>
> What all should I need to know for getting the inverse in Hama. I can start
> looking at it and implementing it for Hama.
>
> --Thanks and Regards
> Vaijanath
>
>
> Chanwit Kaewkasi wrote:
> > Would we raise an inverse operation issue in JIRA?
> >
> > Cheers,
> >
> > Chanwit
> >
> > 2008/7/23 Edward J. Yoon <edwardyoon@apache.org>:
> >
> >
> > >
> > > > Actually, in my work, I'll use Newton's method which involves many
> > > > matrix multiplication and subtraction. It seems that you have finished
> > > > this part.
> > > >
> > > >
> > > Yes, It done.
> > >
> > >
> > >
> > > > BTW, although I plan to use Quasi-Newton method to avoid calculate the
> > > > inverse of Hessian directly, I'm wonder do you plan to implement the
> > > > inverse operation?
> > > >
> > > >
> > > Of course, We also have a lot of needs and issues regarding inverse
> operation.
> > >
> > > Regards, Edward J. Yoon
> > >
> > > On Wed, Jul 23, 2008 at 11:02 PM, Yun Jiang <helenjyun@gmail.com> wrote:
> > >
> > >
> > > > Hi,
> > > > That's great,  since this can reduce much of my work:)
> > > > Actually, in my work, I'll use Newton's method which involves many
> > > > matrix multiplication and subtraction. It seems that you have finished
> > > > this part.
> > > >
> > > > BTW, although I plan to use Quasi-Newton method to avoid calculate the
> > > > inverse of Hessian directly, I'm wonder do you plan to implement the
> > > > inverse operation?
> > > >
> > > > Best,
> > > >
> > > > On Wed, Jul 23, 2008 at 9:28 PM, Chanwit Kaewkasi <chanwit@gmail.com>
> wrote:
> > > >
> > > >
> > > > > Hello Yun,
> > > > >
> > > > > Glad to see another gsoc-er around :-)
> > > > > I'm doing gsoc for another project (Groovy) while helping Edward
> > > > > incubate this one.
> > > > >
> > > > > Cheers,
> > > > >
> > > > > Chanwit
> > > > >
> > > > > 2008/7/23 Yun Jiang <helenjyun@gmail.com>:
> > > > >
> > > > >
> > > > > > Hi, all
> > > > > > I'm implementing Logistic Regression in project of mahout in
gsoc.
> > > > > > Is that ok if I use hama in my project?
> > > > > >
> > > > > > Thanks,
> > > > > > Yun
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> > > --
> > > Best regards, Edward J. Yoon
> > > edwardyoon@apache.org
> > > http://blog.udanax.org
> > >
> > >
> > >
> >
> >
> >
>
>


-- 
Best regards, Edward J. Yoon
edwardyoon@apache.org
http://blog.udanax.org

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