| {
|
| "protocol": "temporal leave-one-out, three-way (train / val / test)",
|
| "fold_assignment": {
|
| "test": "last interaction per user",
|
| "val": "second-last interaction per user",
|
| "train": "all earlier interactions"
|
| },
|
| "temporal_scope": {
|
| "ordering": "per user, not global",
|
| "note": "Each user's own history is split chronologically, so no user's future leaks into their training data. Across users the folds overlap in wall-clock time: one user's training review can be later than another user's test review. This is the standard leave-last-one-out protocol; a single global cut-off date would be a different and stricter setting, and is not used here."
|
| },
|
| "relevance": {
|
| "definition": "implicit next-item: the chronologically next hotel the user reviewed",
|
| "all_ratings_are_positive": true,
|
| "relevance_threshold": null,
|
| "note": "Ratings are not thresholded by default; the holdout item is relevant because it was visited, not because it scored well."
|
| },
|
| "min_interactions": 4,
|
| "seed": 42,
|
| "n_users": 798,
|
| "n_items": 535,
|
| "n_train": 8645,
|
| "n_val": 798,
|
| "n_test": 798,
|
| "train_history_length": {
|
| "min": 2,
|
| "median": 5.0,
|
| "max": 208
|
| },
|
| "users_with_train_history_2": 183,
|
| "users_evaluated": {
|
| "val": 798,
|
| "test": 798
|
| },
|
| "sparsity_pct": 97.6012,
|
| "output_dir": "benchmark",
|
| "folds": {
|
| "train": {
|
| "n": 8645,
|
| "n_users": 798,
|
| "n_items": 508,
|
| "date_min": "2012-01-08",
|
| "date_max": "2023-12-06",
|
| "rating_mean": 7.5283
|
| },
|
| "val": {
|
| "n": 798,
|
| "n_users": 798,
|
| "n_items": 289,
|
| "date_min": "2015-10-20",
|
| "date_max": "2023-12-07",
|
| "rating_mean": 7.5561
|
| },
|
| "test": {
|
| "n": 798,
|
| "n_users": 798,
|
| "n_items": 278,
|
| "date_min": "2017-07-08",
|
| "date_max": "2023-12-09",
|
| "rating_mean": 7.4976
|
| }
|
| }
|
| } |
