{
  "paper": "2602.22913",
  "adapter": "sigma",
  "dataset": {
    "name": "MiniOneRec Office",
    "train_rows": 12000,
    "validation_users": 128,
    "test_users": 128,
    "items": 3459
  },
  "setup": {
    "model": "HuggingFaceTB/SmolLM2-135M-Instruct",
    "seed": 42,
    "grounding_steps": 40,
    "sft_steps": 480,
    "tasks": [
      "Category",
      "Discover",
      "Holiday",
      "JustForYou",
      "Longtail",
      "Query",
      "Season"
    ],
    "selected": "top1_prefix"
  },
  "training": {
    "grounding_initial_loss": 4.0153248787,
    "grounding_final_loss": 3.747172451,
    "sft_initial_loss": 10.3598239899,
    "sft_final_loss": 7.3062394142
  },
  "test": {
    "id_only": {
      "hr_at_1": 0.0,
      "hr_at_5": 0.0078125,
      "hr_at_10": 0.0078125,
      "hr_at_20": 0.0078125,
      "ndcg_at_10": 0.00390625
    },
    "top1_prefix": {
      "hr_at_1": 0.015625,
      "hr_at_5": 0.03125,
      "hr_at_10": 0.0625,
      "hr_at_20": 0.0703125,
      "ndcg_at_10": 0.034112
    },
    "apf": {
      "hr_at_1": 0.015625,
      "hr_at_5": 0.03125,
      "hr_at_10": 0.0546875,
      "hr_at_20": 0.0625,
      "ndcg_at_10": 0.031452
    }
  },
  "selected_relative_to_id_only_percent": {
    "hr_at_20": 800.0,
    "ndcg_at_10": 773.2672
  },
  "apf_relative_to_top1_prefix_hr_at_20_percent": -11.1111111111,
  "conclusion": "Hybrid prefix-to-ID generation strongly improves the small absolute hit count; validation rejects APF in favor of one prefix.",
  "schema_version": 2,
  "manifest_ref": "reproduction:sigma",
  "evaluation_protocol": {
    "tier": "l3_paper_pipeline",
    "seeds": [
      42
    ],
    "formal_comparison": false,
    "claim_policy": "single/few-seed smoke result; do not claim a stable improvement"
  },
  "provenance": {
    "artifact_path": "docs/reproductions/2602.22913-sigma/metrics/office-seed42.json",
    "historical_migration": "historical-metrics-v2-2026-08-09",
    "original_code_commit": "not recorded",
    "dataset_fingerprint": "not recorded in historical artifact"
  }
}