Discounted cumulative gain

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Discounted Cumulative Gain (DCG) is a measure for ranking quality and measures the usefulness (gain) of an item based on its relevance and position in the provided list. For comparing different lists of recommendations with various lengths, normalized Discounted Cumulative Gain (nDCG/NDCG) is used. It is computed by dividing the DCG by the Ideal Discounted Cumulative Gain or IDCG. The higher the nDCG, the better ranked list.

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