{
  "paper": {
    "title": "HAP: Heterogeneity-Aware Pre-ranking"
  },
  "dataset": {
    "name": "MovieLens 100K",
    "users": 260,
    "items": 420
  },
  "setup": {
    "adapter": "hap",
    "same_split_and_candidates": true
  },
  "baseline": {
    "name": "shared transition + content baseline",
    "hit_at_10": 0.08846153846153847,
    "ndcg_at_10": 0.03539806521543129,
    "fresh_hit_at_10": 0.027777777777777776,
    "head_share_at_10": 0.29384615384615387
  },
  "method": {
    "name": "HAP",
    "hit_at_10": 0.07692307692307693,
    "ndcg_at_10": 0.037134024326750385,
    "fresh_hit_at_10": 0.027777777777777776,
    "head_share_at_10": 0.28192307692307694
  },
  "relative": {
    "hit_at_10_percent": -13.043478260869566,
    "ndcg_at_10_percent": 4.904107331160936,
    "fresh_hit_at_10_percent": 0.0,
    "head_share_at_10_percent": -4.057591623036649
  },
  "stages": {
    "gradient_harmonized_contrastive_difficulty": true,
    "difficulty_aware_model_routing": true,
    "strong_route_fraction": 0.3,
    "validation_selected_alpha": 0.1,
    "validation": {
      "hit_at_10": 0.11153846153846154,
      "ndcg_at_10": 0.05965531448282452,
      "fresh_hit_at_10": 0.04,
      "head_share_at_10": 0.2907692307692308
    }
  },
  "paper_results": {
    "app_duration_percent": 0.4,
    "active_days_percent": 0.05,
    "compute_increase_percent": 0.0
  },
  "scope": "在 MovieLens-100K 全库排序上实际执行论文核心状态、训练目标或推理路径；未使用公司私有特征、生产流量和在线服务，线上 A/B 数字只引用原文。",
  "schema_version": 2,
  "manifest_ref": "reproduction:hap",
  "evaluation_protocol": {
    "tier": "l2_public_dataset",
    "seeds": [
      42
    ],
    "formal_comparison": false,
    "claim_policy": "single/few-seed smoke result; do not claim a stable improvement"
  },
  "provenance": {
    "artifact_path": "docs/reproductions/2603.03770-hap/metrics/public-seed42.json",
    "historical_migration": "historical-metrics-v2-2026-08-09",
    "original_code_commit": "not recorded",
    "dataset_fingerprint": "not recorded in historical artifact"
  }
}