Normalized Discounted Cumulative Gain (NDCG) is an evaluation metric used to measure the effectiveness of information retrieval systems, particularly in ranking tasks. It considers the position of relevant items in the ranked list, giving higher scores to relevant documents that appear earlier in the list. This metric helps compare the performance of different ranking algorithms by normalizing the cumulative gain with respect to an ideal ranking, making it easier to assess the quality of search results and recommendations.
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