unseen relevant Semantic Search@k irrelevant 8 1 k items • Found in lexical search: {1,2,3,5,8} → 5 items • Found in semantic search: {3,6,1,9,2,4,7} → 7 items • Found in both: {1,3} → 2 items NDCG is almost the same but what are retrieved? Method NDCG@100 Lexical (Combined + Relaxation) 0.5394 Semantic (CL) 0.5328 3