src/transformers/pipelines/zero_shot_classification.py/ZeroShotClassificationPipeline/__init__
class ZeroShotClassificationPipeline:    def __init__(self, args_parser=ZeroShotClassificationArgumentHandler(), *args, **kwargs):
        self._args_parser = args_parser
        super().__init__(*args, **kwargs)
        if self.entailment_id == -1:
            logger.warning(
                "Failed to determine 'entailment' label id from the label2id mapping in the model config. Setting to "
                "-1. Define a descriptive label2id mapping in the model config to ensure correct outputs."
            )