def get_trainable_attribute_names(self) -> tuple[str, str]:
        """
        Get the names of trainable attributes.

        :return: A tuple of trainable attributes.
        """
        # For scikit-learn <=0.24
        if hasattr(self.model, "sigma_"):
            return "sigma_", "theta_"

        return "var_", "theta_"

        Get the names of trainable attributes.

        :return: A tuple of trainable attributes.
        
art/estimators/classification/scikitlearn.py