src/transformers/data/metrics/__init__.py/acc_and_f1
def acc_and_f1(preds, labels):
    warnings.warn(DEPRECATION_WARNING, FutureWarning)
    requires_backends(acc_and_f1, "sklearn")
    acc = simple_accuracy(preds, labels)
    f1 = f1_score(y_true=labels, y_pred=preds)
    return {
        "acc": acc,
        "f1": f1,
        "acc_and_f1": (acc + f1) / 2,
    }