{
  "paper": {
    "title": "SPEAR: Selection-aware Personalized Rewriting and Retrieval"
  },
  "dataset": {
    "name": "MovieLens 100K",
    "users": 260,
    "items": 420
  },
  "setup": {
    "adapter": "spear",
    "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": "SPEAR",
    "hit_at_10": 0.09230769230769231,
    "ndcg_at_10": 0.04493834320844529,
    "fresh_hit_at_10": 0.027777777777777776,
    "head_share_at_10": 0.22192307692307692
  },
  "relative": {
    "hit_at_10_percent": 4.3478260869565215,
    "ndcg_at_10_percent": 26.951410860882437,
    "fresh_hit_at_10_percent": 0.0,
    "head_share_at_10_percent": -24.476439790575924
  },
  "stages": {
    "dual_embedding_gradient_isolation": true,
    "multiplicative_rewrite_gate": true,
    "dynamic_rewrite_selector": true,
    "original_query_residual": true,
    "validation_selected_alpha": 0.1,
    "validation": {
      "hit_at_10": 0.11538461538461539,
      "ndcg_at_10": 0.06099429915709443,
      "fresh_hit_at_10": 0.08,
      "head_share_at_10": 0.23846153846153847
    }
  },
  "paper_results": {
    "semantic_similarity_at_10_percent": 18.2,
    "click_recall_at_10_percent": 99.5,
    "query_view_ctr_percent": 0.259,
    "reading_depth_percent": 0.733
  },
  "scope": "MovieLens-100K 的公开内容特征与行为序列用于执行论文核心机制；没有使用生产私有流量、线上触发器或十亿级向量索引，线上指标只引用原文。",
  "schema_version": 2,
  "manifest_ref": "reproduction:spear",
  "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/2608.01738-spear/metrics/public-seed42.json",
    "historical_migration": "historical-metrics-v2-2026-08-09",
    "original_code_commit": "not recorded",
    "dataset_fingerprint": "not recorded in historical artifact"
  }
}