On Mar 25, 2013 6:44 AM, "Sean Owen" <[email protected]> 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 <[email protected]> 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).
