{
  "phase": "Phase 3 - Retail Search Discovery (Amazon ESCI, M-0003)",
  "dataset": "Amazon Shopping Queries (ESCI), Task 1, English us, small version",
  "corpus": {
    "products": 1215854,
    "indexSizeMb": 1491.6,
    "index": "esci-products-us-v0"
  },
  "judgments": {
    "total": 601354,
    "queries": 29844,
    "uniqueProducts": 482105,
    "testQueries": 8956
  },
  "labels": {
    "E": "Exact (gain 1.0)",
    "S": "Substitute (0.1)",
    "C": "Complement (0.01)",
    "I": "Irrelevant (0.0)"
  },
  "structuredFields": [
    "title",
    "brand",
    "color",
    "bullets",
    "description"
  ],
  "fieldBoosts": {
    "title": 3,
    "brand": 2,
    "color": 1,
    "bullets": 1,
    "description": 1
  },
  "coreArchitecture": "ARCH-0.5. Default /api/esci/search is fast BM25 (production-shaped). BGE hybrid (int8 kNN over 1.2M via Workers AI query embedding) available at ?mode=hybrid; better semantics but ~3.5s on the free-tier instance, so opt-in until a larger instance is provisioned.",
  "modes": {
    "officialRerank": "rank provided candidate lists; comparable to published numbers",
    "endToEnd": "retrieve from the full product corpus; the project's real problem, judgment-incomplete"
  }
}