ALS-WR weights the error on each term differently, so the average error doesn't really have meaning here, even if you are comparing the difference with "1". I think you will need to fall back to mean average precision or something.
On Mon, May 6, 2013 at 11:24 AM, William <icswilliam2...@gmail.com> wrote: > Sean Owen <srowen <at> gmail.com> writes: > >> >> If you have no ratings, how are you using RMSE? this typically >> measures error in reconstructing ratings. >> I think you are probably measuring something meaningless. >> > > > I suppose the rate of seen movies are 1. Is it right? > If I use Collaborative Filtering with ALS-WR to get some recommendations, I > must have a real rating-matrix? > > >
