docs: def _linear_weights(clf, x, top, flt_feature_names, flt_indices):
      """ Return top weights getter for label_id.
      """
      def _weights(label_id, scale=1.0):
          coef = get_coef(clf, label_id)
          scores = _multiply(x, coef)
          return get_top_features_filtered(x, flt_feature_names, flt_indices,
                                           scores, top, scale)
      return _weights