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From Sean Owen <>
Subject Re: Mathematical background of ALS recommenders
Date Mon, 25 Mar 2013 13:44:11 GMT
(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.)

On Mon, Mar 25, 2013 at 1:38 PM, Dmitriy Lyubimov <> wrote:
> 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 heard).

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