dev(narugo): remove support for regression attachments

        return retval

    def _predict_regression(self, embedding: np.ndarray, fmt: Any = 'full'):

        """

        Make regression predictions.

        :param embedding: Input embedding array

        :type embedding: np.ndarray

        :param fmt: Format specification for output

        :type fmt: Any

        :return: List of formatted prediction results

        :rtype: list

        """

        field_names = [name for name, _, _ in self._meta['problem']['fields']]

        logits, prediction = self._predict_raw(embedding)

        retval = []

        for logit, pred in zip(logits, prediction):

            result = dict(zip(field_names, pred.tolist()))

            retval.append(vreplace(fmt, {

                'full': result,

                'logit': logit,

                'prediction': pred,

                **{f'field/{key}': value for key, value in result.items()},

            }))

        return retval

    def predict(self, embedding: np.ndarray, **kwargs):

        """

        Make predictions based on the problem type (classification, tagging, or regression).

            result = self._predict_classification(embedding, **kwargs)

        elif problem_type == 'tagging':

            result = self._predict_tagging(embedding, **kwargs)

        elif problem_type == 'regression':

            result = self._predict_regression(embedding, **kwargs)

        else:

            raise ValueError(f'Unknown problem type - {problem_type!r}.')