evaluating recommender systems

[jamborta]

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.
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