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From Agata Filiana <a.filian...@gmail.com>
Subject Evaluating Recommender System
Date Sat, 01 Jun 2013 18:17:30 GMT
Hi, I'm trying to evaluate my recommender system in Mahout.
I have boolean data and I'm using *GenericBooleanPrefUserBasedRecommender*
I used precision and recall and it's returning *throwing
java.lang.IllegalArgumentException: Illegal nDCG: NaN**
*
*
*
Does this mean I don't have enough data to evaluate? Is there any way to do
evaluation on this data?

Thank you
*
Agata Filiana
**http://about.me/dewtraveller* <http://about.me/dewtraveller>*
*

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