Yes, I know that RMSE and offline evaluation have many drawbacks, but I just need to compute it.
Yes, I need to implement a lookup function, I was wondering which is the easiest way, since I am not a Java programmer and I've started using Mahout since a few days ago. Eugenio 2015-02-15 1:10 GMT+01:00 Ted Dunning <ted.dunn...@gmail.com>: > On Sat, Feb 14, 2015 at 6:05 AM, Eugenio Tacchini < > eugenio.tacch...@gmail.com> wrote: > > > Hi Pat, I don't understand why it is not a Mahout problem, my goal is to > > evaluate (RMSE) the output of a user based algorithm comparing different > > user similarity measures, Mahout already has everything I need except the > > fact I cannot give in input a custom similarity matrix. > > > > You should be able to implement a special user similarity function that is > simply a lookup. If you have all the distances, then you aren't worried > about efficiency, by definition. >
