Tag
ndcg
- Dec 12, 2023 Graded Gains and the NDCG Discount How discounted cumulative gain combines a gain mapping and a rank discount, why the logarithmic discount was chosen, and what normalisation does and does not fix. information retrieval
- Nov 15, 2023 LambdaMART and Metric-Driven Gradient Boosting How lambda gradients weight document pairs by their effect on NDCG, why the resulting tree ensemble is trained on pseudo-residuals, and where the heuristic gradient fails. information retrieval