OK hmm, is it possible this could happen from duplicate user/pref/score values in my data? How does Mahout handle duplicate entries in data, whether in a load-once file or coming from a refresh?
On Sun, Jul 15, 2012 at 4:01 AM, Sean Owen <sro...@gmail.com> wrote: > This sounds like a target leak, like your test data is actually > getting copied into the training data. > > On Sun, Jul 15, 2012 at 1:08 AM, Matt Mitchell <goodie...@gmail.com> wrote: >> One strange thing, and I'm going to dig through the MIA book tonight, >> is that my user based recommendation evaluator returns 0.0 no matter >> what I do. It's setup using PearsonCorrelationSimilarity, >> NearestNUserNeighborhood(2), GenericUserBasedRecommender and the >> AverageAbsoluteDifferenceRecommenderEvaluator. Also, my prefs do have >> values, a range from 1 to 3.
