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" <[email protected]> wrote: Hi, Does the SVD decompsition (Lanczos algorithm) implemented in Mahout only return one eigenvectors, not both left and right eigenvectors ? Thanks, Zhongming
