Thanks for info!
I also found documentation for ssvd:
https://cwiki.apache.org/MAHOUT/stochastic-singular-value-decomposition.html
That would definitley completly solve my problem.
Big Thanks again!
W dniu 22.11.2012 22:00, Ted Dunning pisze:
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?
