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From Jake Mannix <jake.man...@gmail.com>
Subject Re: SVD in mahout
Date Thu, 22 Apr 2010 14:34:48 GMT
Both svd implementations in mahout return only the right singular vectors
(the vectors with dimensionality equal to the number of columns of the input
matrix).

Recovering the left singular vectors is just a matter of multiplying your
input matrix by your right singular vectors and the inverse singular values,
one more pass over the data.

-jake

On Apr 22, 2010 3:45 AM, "Zhongming cai" <caizjh@yahoo.co.uk> wrote:

Hi,

Does the SVD decompsition (Lanczos algorithm) implemented in Mahout only
return one eigenvectors, not both left and right eigenvectors ?

Thanks,

Zhongming

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