scoring/score.py

"""MA-Bench scorer. Standalone: python score.py rubric_items.jsonl verdicts.jsonl

verdicts.jsonl: one line per graded brief, {"case_id": "C1", "brief_id": "...", "failed_items": ["S1-01-n", ...]}
where failed_items are the rubric item_ids the judge marked as NOT satisfying pass_condition (the judge returns
failures only; every unlisted item counts as passed). For D and CD items the pass condition asserts the mistake is
present, so an unlisted (passed) negative item incurs its negative weight.

Prints per-brief unweighted pass rate and severity-weighted score, then per-case means.
"""

import json
import sys
import collections
import statistics as st


def load_items(path):
  by = collections.defaultdict(dict)
  for line in open(path):
    it = json.loads(line)
    by[it["case_id"]][it["item_id"]] = it
  return by


def score(items, failed):
  pos = [i for i in items.values() if i["weight"] > 0]
  neg = [i for i in items.values() if i["weight"] < 0]
  earned = sum(i["weight"] for i in pos if i["item_id"] not in failed)
  incurred = sum(
    i["weight"] for i in neg if i["item_id"] not in failed
  )  # mistake present
  correct = sum(1 for i in pos if i["item_id"] not in failed) + sum(
    1 for i in neg if i["item_id"] in failed
  )
  return {
    "pass_rate": correct / len(items),
    "weighted": (earned + incurred) / sum(i["weight"] for i in pos),
    "detrimental_present": sum(1 for i in neg if i["item_id"] not in failed),
  }


def main():
  items = load_items(sys.argv[1])
  per_case = collections.defaultdict(list)
  for line in open(sys.argv[2]):
    v = json.loads(line)
    s = score(items[v["case_id"]], set(v["failed_items"]))
    per_case[v["case_id"]].append(s)
    print(
      f"{v['case_id']}\t{v.get('brief_id', '')}\tpass={s['pass_rate']:.3f}\tweighted={s['weighted']:.3f}\tdetrimental={s['detrimental_present']}"
    )
  for c, ss in sorted(per_case.items()):
    print(
      f"# {c}\tn={len(ss)}\tpass={st.mean(x['pass_rate'] for x in ss):.3f}\tweighted={st.mean(x['weighted'] for x in ss):.3f}"
    )


if __name__ == "__main__":
  main()