Why is my recommender evaluation returning NaN? I'm using the AverageAbsoluteDifferenceRecommenderEvaluator.
The individual calls to the recommender return valid results, and stepping through the evaluator shows normal operation with floats being shuffled around as one would expect. I made my own evaluation loop by running Recommender.estimatePreference() manually. This shows some variation from the SlopeOne recommender, but no crazy numbers or NaNs. This is on 100k samples from the GroupLens 100m dataset. -- Lance Norskog [email protected]
