scripts/poster_metrics.py

#!/usr/bin/env python3
"""Reproduce the headline table of the AI4Law poster (and its footnote numbers).

Reads ``data/analysis/per_column.csv`` (produced by ``legex-analysis`` over all
countries and models; regenerate the whole chain with
``scripts/reproduce_paper.sh``) and aggregates the per-field confusion buckets
over two field sets:

* ``10 structured fields`` -- the 11 evaluated fields minus the free-text
  ``legal_subject_judgement`` (unbounded label space, human-human agreement
  <1%, see data/analysis/iaa/ANALYSIS.md section 2.1);
* ``Cost block (4 fields)`` -- dispute value, losing share, court costs,
  party compensation.

For every system it prints recall on gold-filled cells, precision on emitted
cells, F1, and the false-fill (hallucination) rate on gold-empty cells, each
with its denominator n and +-1 SE = sqrt(p*(1-p)/n) in percentage points.
Metric definitions match ``legex/analysis/quant_results.py::_metrics`` and
``legex/evaluation`` (buckets: tp / mismatch / missed / hallucinated / tn).

Usage:
    uv run python scripts/poster_metrics.py            # human-readable table
    uv run python scripts/poster_metrics.py --latex    # poster LaTeX rows
"""

import argparse
import csv
import math
from collections import defaultdict
from pathlib import Path

EVAL_FIELDS: tuple[str, ...] = (
    "legal_subject_judgement",
    "trial_start_date",
    "trial_end_date",
    "dispute_value_nominal",
    "plaintiff_loosing_share",
    "court_cost_awarded_nominal",
    "party_compensation_awarded_nominal",
    "plaintiffs_all_count",
    "defendants_all_count",
    "plaintiff_no1_ISIC1_industry_category",
    "defendant_no1_ISIC1_industry_category",
)

COST_BLOCK: tuple[str, ...] = (
    "dispute_value_nominal",
    "plaintiff_loosing_share",
    "court_cost_awarded_nominal",
    "party_compensation_awarded_nominal",
)

STRUCTURED: tuple[str, ...] = tuple(
    f for f in EVAL_FIELDS if f != "legal_subject_judgement"
)

FIELD_SETS: tuple[tuple[str, tuple[str, ...]], ...] = (
    ("10 structured fields", STRUCTURED),
    ("Cost block (4 fields)", COST_BLOCK),
    ("All 11 fields", EVAL_FIELDS),  # footnote cross-check: recall 51-58%
)

# (model id in CSV, poster label). Order = row order in the poster table.
SYSTEMS: tuple[tuple[str, str], ...] = (
    ("gemini/gemini-3.1-flash-lite", "Gemini"),
    ("gpt-5.4-mini", "ChatGPT"),
    ("harvey", "Harvey"),
)

_BUCKETS = ("tp", "mismatch", "missed", "hallucinated", "tn")


def _se_pp(p: float, n: int) -> float:
    """+-1 standard error of a proportion, in percentage points."""
    return 100.0 * math.sqrt(p * (1.0 - p) / n) if n else float("nan")


def _aggregate(csv_path: Path) -> dict[str, dict[str, dict[str, int]]]:
    """model -> column -> summed confusion buckets."""
    counts: dict[str, dict[str, dict[str, int]]] = defaultdict(
        lambda: defaultdict(lambda: {k: 0 for k in _BUCKETS})
    )
    with csv_path.open(newline="") as fh:
        for row in csv.DictReader(fh):
            cell = counts[row["model"]][row["column"]]
            for k in _BUCKETS:
                cell[k] += int(row[k])
    return counts


def _metrics(c: dict[str, int]) -> dict[str, float]:
    tp, mism, miss, hallu, tn = (
        c["tp"], c["mismatch"], c["missed"], c["hallucinated"], c["tn"],
    )
    gold_filled = tp + mism + miss
    gold_empty = hallu + tn
    emitted = tp + mism + hallu
    r = tp / gold_filled if gold_filled else 0.0
    p = tp / emitted if emitted else 0.0
    return {
        "n_gold_filled": gold_filled,
        "n_gold_empty": gold_empty,
        "n_emitted": emitted,
        "recall": r,
        "recall_se": _se_pp(r, gold_filled),
        "precision": p,
        "precision_se": _se_pp(p, emitted),
        "f1": 2 * p * r / (p + r) if (p + r) else 0.0,
        "false_fill": hallu / gold_empty if gold_empty else 0.0,
        "false_fill_se": _se_pp(hallu / gold_empty if gold_empty else 0.0, gold_empty),
    }


def _sum_fields(
    per_column: dict[str, dict[str, int]], fields: tuple[str, ...]
) -> dict[str, int]:
    out = {k: 0 for k in _BUCKETS}
    for f in fields:
        for k in _BUCKETS:
            out[k] += per_column[f][k]
    return out


def main() -> None:
    ap = argparse.ArgumentParser(description=__doc__.splitlines()[0])
    ap.add_argument(
        "--csv",
        type=Path,
        default=Path(__file__).resolve().parents[1] / "data/analysis/per_column.csv",
        help="per_column.csv produced by legex-analysis (default: data/analysis/)",
    )
    ap.add_argument(
        "--latex", action="store_true",
        help="emit the poster table rows as LaTeX instead of plain text",
    )
    args = ap.parse_args()

    counts = _aggregate(args.csv)

    if args.latex:
        for model, label in SYSTEMS:
            cells: list[str] = []
            for _, fields in FIELD_SETS[:2]:  # structured + cost block only
                m = _metrics(_sum_fields(counts[model], fields))
                cells += [
                    f"{m['recall'] * 100:.1f}\\%",
                    f"{m['precision'] * 100:.1f}\\%",
                    f"{m['f1']:.2f}",
                    f"{m['false_fill'] * 100:.1f}\\%",
                ]
            print(f"{label} & " + " & ".join(cells) + r" \\")
        return

    for set_name, fields in FIELD_SETS:
        print(f"=== {set_name} ===")
        for model, label in SYSTEMS:
            m = _metrics(_sum_fields(counts[model], fields))
            print(
                f"{label:8s}"
                f"  recall {m['recall'] * 100:5.1f}% +-{m['recall_se']:.1f}"
                f" (n={m['n_gold_filled']})"
                f"  precision {m['precision'] * 100:5.1f}% +-{m['precision_se']:.1f}"
                f" (n={m['n_emitted']})"
                f"  F1 {m['f1']:.3f}"
                f"  false-fill {m['false_fill'] * 100:5.1f}% +-{m['false_fill_se']:.1f}"
                f" (n={m['n_gold_empty']})"
            )
        print()


if __name__ == "__main__":
    main()