How is the NDCG calculated when IDCG = 0? #12028
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So, I am working with a binary ranking problem, and multiple groups have no revelant query (all values equal to 0). I want to understand how those groups are impacting the global NDCG metric, as IDCG = 0. Is the NDCG in those cases set to 0? or set to 1? or none of those. |
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Answered by
trivialfis
Feb 24, 2026
Replies: 1 comment
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When IDCG is 0, the NDCG is set to 0. |
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Answer selected by
trivialfis
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When IDCG is 0, the NDCG is set to 0.