licensed under the apache license version 2 0 the license you may not use this file except in compliance with the license you may obtain a copy of the license at http www apache orglicenseslicense2 0 unless required by applicable law or agreed to in writing software distributed under the license is distributed on an as is basis without warranties or conditions of any kind either express or implied see the license for the specific language governing permissions and limitations under the license licensed under the apache license version 2 0 the license you may not use this file except in compliance with the license you may obtain a copy of the license at http www apache org licenses license 2 0 unless required by applicable law or agreed to in writing software distributed under the license is distributed on an as is basis without warranties or conditions of any kind either express or implied see the license for the specific language governing permissions and limitations under the license
import warnings

from ...utils import is_sklearn_available, requires_backends


if is_sklearn_available():
    from scipy.stats import pearsonr, spearmanr
    from sklearn.metrics import f1_score, matthews_corrcoef


DEPRECATION_WARNING = (
    "This metric will be removed from the library soon, metrics should be handled with the 🤗 Evaluate "
    "library. You can have a look at this example script for pointers: "
    "https://github.com/huggingface/transformers/blob/main/examples/pytorch/text-classification/run_glue.py"
)


def simple_accuracy(preds, labels):
    warnings.warn(DEPRECATION_WARNING, FutureWarning)
    requires_backends(simple_accuracy, "sklearn")
    return (preds == labels).mean()


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,
    }


def pearson_and_spearman(preds, labels):
    warnings.warn(DEPRECATION_WARNING, FutureWarning)
    requires_backends(pearson_and_spearman, "sklearn")
    pearson_corr = pearsonr(preds, labels)[0]
    spearman_corr = spearmanr(preds, labels)[0]
    return {
        "pearson": pearson_corr,
        "spearmanr": spearman_corr,
        "corr": (pearson_corr + spearman_corr) / 2,
    }


def glue_compute_metrics(task_name, preds, labels):
    warnings.warn(DEPRECATION_WARNING, FutureWarning)
    requires_backends(glue_compute_metrics, "sklearn")
    assert len(preds) == len(labels), f"Predictions and labels have mismatched lengths {len(preds)} and {len(labels)}"
    if task_name == "cola":
        return {"mcc": matthews_corrcoef(labels, preds)}
    elif task_name == "sst-2":
        return {"acc": simple_accuracy(preds, labels)}
    elif task_name == "mrpc":
        return acc_and_f1(preds, labels)
    elif task_name == "sts-b":
        return pearson_and_spearman(preds, labels)
    elif task_name == "qqp":
        return acc_and_f1(preds, labels)
    elif task_name == "mnli":
        return {"mnli/acc": simple_accuracy(preds, labels)}
    elif task_name == "mnli-mm":
        return {"mnli-mm/acc": simple_accuracy(preds, labels)}
    elif task_name == "qnli":
        return {"acc": simple_accuracy(preds, labels)}
    elif task_name == "rte":
        return {"acc": simple_accuracy(preds, labels)}
    elif task_name == "wnli":
        return {"acc": simple_accuracy(preds, labels)}
    elif task_name == "hans":
        return {"acc": simple_accuracy(preds, labels)}
    else:
        raise KeyError(task_name)


def xnli_compute_metrics(task_name, preds, labels):
    warnings.warn(DEPRECATION_WARNING, FutureWarning)
    requires_backends(xnli_compute_metrics, "sklearn")
    if len(preds) != len(labels):
        raise ValueError(f"Predictions and labels have mismatched lengths {len(preds)} and {len(labels)}")
    if task_name == "xnli":
        return {"acc": simple_accuracy(preds, labels)}
    else:
        raise KeyError(task_name)