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Jiaming Yuan 72e8331eab
Reimplement the NDCG metric. (#8906) 
- Add support for non-exp gain.
- Cache the DMatrix object to avoid re-calculating the IDCG.
- Make GPU implementation deterministic. (no atomic add)
2023-03-15 03:26:17 +08:00
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xgboost
Reimplement the NDCG metric. (#8906)
2023-03-15 03:26:17 +08:00