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what does 0 as output means in AverageAbsoluteDifferenceRecommenderEvaluator in mahout?


I am currently playing with Apache mahout and reading book Mahout in Action and it confused me about the evaluator which we use in evaluation of recommender system and specifically i wanted to ask about AverageAbsoluteDifferenceRecommenderEvaluator i.e when it results in 0.

Does it means there is no error or does it means recommendation system is very bad?

Thanks.

Solution

  • 0 means a perfect match.

    RecommenderEvaluator returns MeanAverageError, representing how well the Recommender's estimated preferences match real values; lower scores mean a better match: 0 no error at all.

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