Metrics, NLP, Search, Recommendation System, Evaluation.
(Mjolnir): 3 Relevance Score (Stormbreaker): 2 Relevance Score (Jarnbjorn): 1 Cumulative Gain (i) = 3+ 2+ 1= 6 DCG (i) = (3 / log(1+1)) + (2 / log(2+1)) + (1 / log(3+1)) = 3 + 1.26 + 0.5 = 4.76 NDCG = DCG / DCG (i) = 2.89 / 4.76 = 0.61 NDCG is always between 0 and 1. From the above example, we can