{
  "schema_version": 2,
  "paper": "2609.29180",
  "adapter": "xrec",
  "dataset": "MovieLens 1M",
  "users": 6038,
  "items": 3706,
  "metrics": {
    "validation_hit_at_10_xrec_mean": 0.0024842663,
    "validation_hit_at_10_u2i_mean": 0.0043612675,
    "validation_ndcg_at_10_xrec_mean": 0.0010923816,
    "validation_ndcg_at_10_u2i_mean": 0.001779073,
    "test_hit_at_10_xrec_mean": 0.0017665894,
    "test_hit_at_10_u2i_mean": 0.0044164734,
    "test_ndcg_at_10_xrec_mean": 0.0008587753,
    "test_ndcg_at_10_u2i_mean": 0.0018499867
  },
  "protocol": "chronological leave-last-two-out; train-only item embeddings and anchors; full-catalog exact ranking with seen-item masking",
  "training_steps": {
    "item_contrastive": 160,
    "xrec_prefix_pretrain": 160,
    "xrec_last_prefix_sft": 40,
    "u2i_baseline": 200
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  "seeds": [
    {
      "seed": 42,
      "validation": {
        "xrec": {
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        "u2i": {
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      },
      "test": {
        "xrec": {
          "hit_at_10": 0.0014905598,
          "ndcg_at_10": 0.0007969283
        },
        "u2i": {
          "hit_at_10": 0.0057966214,
          "ndcg_at_10": 0.0028012488
        }
      }
    },
    {
      "seed": 43,
      "validation": {
        "xrec": {
          "hit_at_10": 0.0026498841,
          "ndcg_at_10": 0.0010028772
        },
        "u2i": {
          "hit_at_10": 0.0018217953,
          "ndcg_at_10": 0.0006734526
        }
      },
      "test": {
        "xrec": {
          "hit_at_10": 0.0018217953,
          "ndcg_at_10": 0.0009397378
        },
        "u2i": {
          "hit_at_10": 0.0014905598,
          "ndcg_at_10": 0.0005498886
        }
      }
    },
    {
      "seed": 44,
      "validation": {
        "xrec": {
          "hit_at_10": 0.0026498841,
          "ndcg_at_10": 0.0010696962
        },
        "u2i": {
          "hit_at_10": 0.0057966214,
          "ndcg_at_10": 0.0022113676
        }
      },
      "test": {
        "xrec": {
          "hit_at_10": 0.0019874131,
          "ndcg_at_10": 0.0008396599
        },
        "u2i": {
          "hit_at_10": 0.0059622392,
          "ndcg_at_10": 0.0021988227
        }
      }
    }
  ],
  "diagnostic_only": true,
  "scope": "Public-data core-mechanism reproduction, not TikTok production or paper-result replication",
  "manifest_ref": "reproduction:xrec",
  "evaluation_protocol": {
    "tier": "l2_public_dataset",
    "seeds": [
      42,
      43,
      44
    ],
    "formal_comparison": false,
    "claim_policy": "limited-budget L2 mechanism check; no paper-effectiveness or production-lift claim"
  },
  "provenance": {
    "artifact_path": "docs/reproductions/2609.29180-xrec/metrics/public-seeds42-44.json",
    "dataset_fingerprint": "MovieLens-1M ratings.dat sha256:506d64ca44484487c11dc2d9a28de5c54948213e6b96285e298afe28d6ea4e0f"
  }
}