Add normalized discounted cumulative gain to recommender evaluator
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Key: MAHOUT-619
URL: https://issues.apache.org/jira/browse/MAHOUT-619
Project: Mahout
Issue Type: Improvement
Components: Collaborative Filtering
Affects Versions: 0.4
Reporter: Sean Owen
Assignee: Sean Owen
Priority: Minor
Fix For: 0.5
Just tracking a simple improvement: add nDCG to precision and recall
computations in GenericRecommenderIRStatsEvaluator
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