src/transformers/pipelines/token_classification.py/TokenClassificationPipeline/__init__
class TokenClassificationPipeline:    def __init__(self, args_parser=TokenClassificationArgumentHandler(), *args, **kwargs):
        self.ignore_labels = ["O"]
        super().__init__(*args, **kwargs)
        self.check_model_type(
            TF_MODEL_FOR_TOKEN_CLASSIFICATION_MAPPING
            if self.framework == "tf"
            else MODEL_FOR_TOKEN_CLASSIFICATION_MAPPING
        )

        self._basic_tokenizer = BasicTokenizer(do_lower_case=False)
        self._args_parser = args_parser