I think that "training the model only on the new user" is essentially identical to "fold in the new user".
On Fri, Oct 12, 2012 at 11:30 AM, Sean Owen <[email protected]> wrote: > I may be misreading or oversimplifying, but I think what he is talking > about is fold-in. Given the item-feature matrix, there is a simple > analytical solution for the new user-feature matrix row which you > compute directly. Or else, I don't know what else is intended... he's > not talking about updating anything item factors or any other user > features after all. > > On Fri, Oct 12, 2012 at 6:19 PM, Ahmet Ylmaz > <[email protected]> wrote: > > Hi Sebastian, > > What do you think of the technique of retraining the model *only* on the > new user, in order to learn the factors associated with him. > > (Yehuda Koren mentions it here: > http://www.netflixprize.com/community/viewtopic.php?id=815) > > > > Is it worse than folding-in? >
