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Posted to user@mahout.apache.org by Rafal Lukawiecki <ra...@projectbotticelli.com> on 2013/08/15 20:05:09 UTC

RecommenderIRStatsEvaluator Returning Precision==Recall

Please pardon my lack of experience with the Mahout Java library. I have recently started using RecommenderIRStatsEvaluator to check the accuracy of our model/data combinations. I am a bit surprised that the Precision and Recall figures are identical to each other, every time I have run the evaluator. For example (taken from an early stage in the evaluation): 

INFO: Precision/recall/fall-out/nDCG/reach: 0.18461538461538465 / 0.18461538461538465 / 1.0560608928695964E-4 / 0.2039069945815918 / 1.0

If my understanding of precision/recall is correct, this would mean that FP would have to be equal to FN in our model/data—or could there be some other thing affecting the evaluator?

Rafal Lukawiecki