Table 7.
Layouts of 8 carousels selected for the Movielens 20M and Netflix Prize datasets selected according to different strategies and optimizing both the single list NDCG and the proposed two-dimensional N2DCG.
| Movielens 20M | Netflix prize | ||||
|---|---|---|---|---|---|
| NDCG | N2DCG | NDCG | N2DCG | ||
| Incremental greedy | Individual greedy | Incremental greedy | Incremental greedy | Individual greedy | Incremental greedy |
| UserKNN CF | UserKNN CF | UserKNN CF | SLIM ElasticNet | SLIM ElasticNet | SLIM ElasticNet |
| SLIM ElasticNet | SLIM ElasticNet | SLIM ElasticNet | FunkSVD | EASER | FunkSVD |
| FunkSVD | SLIM BPR | FunkSVD | UserKNN CF | UserKNN CF | UserKNN CF |
| IALS | EASER | IALS | MF BPR | PureSVD | MF BPR |
| MF BPR | IALS | MF BPR | IALS | SLIM BPR | IALS |
| NMF | PureSVD | ItemKNN CBF | P3α | IALS | P3α |
| ItemKNN CBF | FunkSVD | NMF | NMF | RP3β | NMF |
| ItemKNN CF | RP3β | ItemKNN CF | ItemKNN CF | ItemKNN CF | ItemKNN CF |
The Individual Greedy layout for N2DCG is missing since that method is based on the traditional single list evaluation.