scripts/evaluate_arabic_meter.py

# -*- coding: utf-8 -*-
"""Baseline evaluation for PoetryMTEB/ArabicPoetryMeterClassification.

Metrics: accuracy, macro-F1, micro-F1.
Default probe: char TF-IDF + LogisticRegression.

Usage:
  python evaluate_arabic_meter.py
"""
from __future__ import annotations

import argparse
import json
from collections import Counter
from pathlib import Path

from datasets import load_dataset
from sklearn.feature_extraction.text import TfidfVectorizer
from sklearn.linear_model import LogisticRegression
from sklearn.metrics import accuracy_score, classification_report, f1_score
from sklearn.pipeline import Pipeline


def main() -> None:
    p = argparse.ArgumentParser()
    p.add_argument("--repo", default="PoetryMTEB/ArabicPoetryMeterClassification")
    p.add_argument("--max-features", type=int, default=50000)
    p.add_argument("--seed", type=int, default=42)
    p.add_argument("--out-json", default="")
    args = p.parse_args()

    ds = load_dataset(args.repo)
    train, test = ds["train"], ds["test"]
    x_train, y_train = list(train["poem"]), list(train["label"])
    x_test, y_test = list(test["poem"]), list(test["label"])

    id2name = {}
    for lab, name in zip(train["label"], train["label_name"]):
        id2name[int(lab)] = name
    target_names = [id2name[i] for i in sorted(id2name)]

    clf = Pipeline(
        [
            (
                "tfidf",
                TfidfVectorizer(
                    analyzer="char",
                    ngram_range=(1, 3),
                    max_features=args.max_features,
                ),
            ),
            (
                "lr",
                LogisticRegression(
                    max_iter=3000,
                    random_state=args.seed,
                    multi_class="multinomial",
                ),
            ),
        ]
    )
    clf.fit(x_train, y_train)
    pred = clf.predict(x_test)
    metrics = {
        "accuracy": float(accuracy_score(y_test, pred)),
        "macro_f1": float(f1_score(y_test, pred, average="macro")),
        "micro_f1": float(f1_score(y_test, pred, average="micro")),
        "n_train": len(y_train),
        "n_test": len(y_test),
        "label_counts_test": dict(Counter(int(x) for x in y_test)),
        "report": classification_report(
            y_test,
            pred,
            labels=sorted(id2name),
            target_names=target_names,
            digits=4,
            zero_division=0,
        ),
    }
    print(json.dumps({k: v for k, v in metrics.items() if k != "report"}, indent=2))
    print(metrics["report"])
    if args.out_json:
        Path(args.out_json).write_text(
            json.dumps(metrics, ensure_ascii=False, indent=2), encoding="utf-8"
        )


if __name__ == "__main__":
    main()