0 is very good! But I agree, it is probably an error. I see you call evaluate() twice. This is not necessary. Call it once, and save the result, then print it. But this is not the issue.
What is in the ItemBasedBuilder class? what is your data like? Maybe if I can see this I can suggest why you get this result. On Thu, Nov 19, 2009 at 5:31 PM, jamborta <[email protected]> wrote: > > hi. > > i'm not sure if this is a bug or I do somthing wrong, but when I try to > evaluate a system it returns 0 as a result. I'm using this piece of code: > > DataModel model = new FileDataModel(new > File("./data/all_data.data")); > RecommenderBuilder build = new ItemBasedBuilder(); > AverageAbsoluteDifferenceRecommenderEvaluator evaluate = new > AverageAbsoluteDifferenceRecommenderEvaluator(); > DataModelBuilder model2 = null; > evaluate.evaluate(build, model2, model,0.8,0.2 ); > System.out.println(evaluate.evaluate(build, model2, > model,0.8,0.2 )); > > thanks a lot. > -- > View this message in context: > http://old.nabble.com/evaluating-recommender-systems-tp26421408p26421408.html > Sent from the Mahout User List mailing list archive at Nabble.com. > >
