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From Dmitriy Lyubimov <>
Subject Re: Mathematical background of ALS recommenders
Date Mon, 25 Mar 2013 13:51:03 GMT
On Mar 25, 2013 6:44 AM, "Sean Owen" <> wrote:
> (The unobserved entries are still in the loss function, just with low
> weight. They are also in the system of equations you are solving for.)

Not in the classic alswr paper i was specifically referring to. It actually
uses minors of observations with unobserved rows or columns  thrown out.
The solution you are often referring to, the implicit feedback, indeed does
not since it is using a different observation encoding technique.

> On Mon, Mar 25, 2013 at 1:38 PM, Dmitriy Lyubimov <>
> > Classic als wr is bypassing underlearning problem by cutting out unrated
> > entries from linear equations system. It also still has a fery defined
> > regularization technique which allows to find optimal fit in theory (but
> > still not in mahout, not without at least some additional sweat, i

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