{
 "rule": "pool = round-2 dev results + incumbents ft-e5-base (size 2) and ft-e5-small (size 1) with their round-1 dev scores; best = max overall; near = overall >= best - 0.003; selected = smallest size rank in near (ties by higher score); runner-up = best-scoring other model",
 "dev_scores": {
  "ft-e5-base": 0.6851297501603847,
  "ft-e5-small": 0.6700276166417629,
  "r2-bgem3": 0.7007568407810918,
  "r2-e5b": 0.7079351835925609,
  "r2-e5b-plain": 0.7066095544829916,
  "r2-e5l": 0.7117165057564516,
  "r2-e5s": 0.7038754488016046
 },
 "near": [
  "r2-e5l"
 ],
 "selected": "r2-e5l",
 "runner_up": "r2-e5b",
 "tie": 0.003,
 "written_utc": "2026-10-01T17:48:17Z",
 "gate": {
  "pass": true,
  "decided_utc": "2026-10-01T15:38:50Z",
  "BookTitleRetrieval": 0.446437329167755,
  "overall": 0.7079351835925609,
  "BookClustering": 0.7339101300956627
 },
 "pairs_sha256": {
  "rows.jsonl": "9ddde8f6ef2750166e4d895b8aba55ba394ba954961169ab0aec0f5d4a541faa",
  "texts.jsonl": "f0c31d84f79e7c3cee0b45e708ec1bb1929f9e2d99d7fbdec66ecb47a1024a28"
 },
 "size_rank": {
  "r2-e5s": 1,
  "ft-e5-small": 1,
  "r2-e5b": 2,
  "r2-e5b-plain": 2,
  "ft-e5-base": 2,
  "r2-e5l": 3,
  "r2-bgem3": 4
 },
 "notes": "dev_scores of ft-e5-base and ft-e5-small are their round-1 dev results (max_seq_length 256, float32); all other pool members were evaluated at max_seq_length 512 in float16. Test was run once, after this selection, on the selected model and the runner-up. gate = the pre-registered recipe gate evaluated on r2-e5b dev (BookTitleRetrieval >= 0.36, overall >= 0.685, BookClustering >= 0.68); pass -> the large runs used mined hard negatives and same-book blocks."
}