That implementation is deprecated. The SSVD implement should be used instead.
On Thu, Nov 22, 2012 at 9:58 AM, Abramov Pavel <[email protected]>wrote: > Hi, > > Here is step by step manual for Lanczos implementation: > > https://cwiki.apache.org/MAHOUT/dimensional-reduction.html > > Pavel > ________________________________________ > От: kuba [[email protected]] > Отправлено: 22 ноября 2012 г. 21:34 > To: [email protected] > Тема: Mahout svd command question > > Hi, > > I'm new to hadoop, mahout, and language processing. > I'm trying to do LSA (Latent Semantic Analysis) in mahout. > I've made my own version of tf-idf matrix building (I know there's > seqdirectory and seq2sparse, that can do it for me, but I needed some > modifications). > I've done 'mahout svd' and I've got output, but don't know how to > interpret it. > > According to books I've read SVD should return three matrices: > M = U * Epsilon * (Vt), > > but 'mahout svd' return only one. I can't find any documentation. Which > one does it return, is it U ? > > Do I have to transpose my tf-idf matrix and compute SVD again to get > second matrix ( V )? > > Also I've found people using: > mahout cleansvd > what is it for? is there any good documentation? > >
