Tensor SVD possible?

Hi, is it possible to do a Tensor SVD with Mahout? If yes, how? Best, B.

QR decomposition in ALS-WR code

I was recently having a look at the ALS-WR factorisation code. Why is there a QR decomposition before computing u_i or m_j instead of multiplying the inverse of A_i with V_i straightaway? (reference to these two classes

Re: QR decomposition in ALS-WR code

Computing an inverse is more costly than solving a linear system via QR decompostion. On 15.03.2013 11:41, Dominik Hübner wrote: I was recently having a look at the ALS-WR factorisation code. Why is there a QR decomposition before computing u_i or m_j instead of multiplying the inverse of

Re: QR decomposition in ALS-WR code

I think you are referring to the same step? QR decomposition is how you solve for u_i which is what I imagine the same step you have in mind.

Re: Problem in Deploying Mahout Recommender As a Web Service

Hi Manuel, Thanks for pointing me to your project! I was able to run it on my machine. However I want to understand more on how you make it since I want to make similar project for my academic project. But the link to your talk (

Boosting User-Based with the user's attributes

Hi, I'm fairly new to Mahout. Right now I am experimenting Mahout by trying to build a simple recommendation system. What I have is just a boolean data set, with only the userID and itemID. I understand that for this case I have to use GenericBooleanPrefUserBasedRecommender - which I have and

Re: Tensor SVD possible?

No. But tensor SVD isn't even uniquely defined. You can get similar results using some tricks, but it depends on special conditions in your problem. Can you say what you are trying to do? On Fri, Mar 15, 2013 at 1:31 AM, Bartholomäus Maciag bartholomaeus.mac...@tu-dortmund.de wrote: Hi, is

Re: Tensor SVD possible?

Hi, I want to create recommendations with it. Ted Dunning ted.dunn...@gmail.com schrieb: No. But tensor SVD isn't even uniquely defined. You can get similar results using some tricks, but it depends on special conditions in your problem. Can you say what you are trying to do? On Fri, Mar

Re: Tensor SVD possible?

Can you give at least a tiny amount of details here? Why? What is the goal? What data? What source? Time varying? Real application or historical data? Is this an academic project? Geographically constrained? This is like asking about databases and saying that you want to store some data.