Hi, Any idea how this method will scale for dense matrices ?The kind of matrices I am going to be working with are 500,000*500,000. Will this be a problem. Also have you used this patch ?
Best Regards from Buffalo Abhishek Agrawal SUNY- Buffalo (716-435-7122) On Wed 02/03/10 1:41 AM , Ganesh Swami gan...@iamganesh.com sent: > What about the Moore-Penrose inverse? > > http://en.wikipedia.org/wiki/Moore-Penrose_pseudoinverse > > The pseudo-inverse coincides with the regular inverse when the matrix > is non-singular. Moreover, it can be computed using the SVD. > > Here's a patch for a MapReduce version of the SVD: > https://issues.apache.org/jira/browse/MAHOUT-180 > Ganesh > > On Tue, Feb 2, 2010 at 10:11 PM, <aa...@buffa > lo.edu> wrote:> Hello People, > > Â Â Â > Â Â Â My name is Abhishek Agrawal. For > the last few days I have been trying> to figure out how to calculate the inverse of a > matrix using Map Reduce. Matrix> inversion has 2 common approaches. Gaussian- > Jordan and the cofactor of transpose> method. But both of them dont seem to be suited > too well for Map- Reduce.> Gaussian Jordan involves blocking co factoring a > matrix requires repeated> calculation of determinant. > > > > Can some one give me any pointers so as to how > to solve this problem ?> > > Best Regards from Buffalo > > > > Abhishek Agrawal > > > > SUNY- Buffalo > > (716-435-7122) > > > > > > > > > > > > >
