class_docstr: Class for importing MXNet Gluon models.
docstr: Return the optimizer used to train the classifier.
  
  :return: The optimizer used to train the classifier.
docstr_tok: ["Return","the","optimizer","used","to","train","the","classifier",".",":","return",":","The","optimizer","used","to","train","the","classifier","."]
code: def optimizer(self) -> "mx.gluon.Trainer":
      """
      Return the optimizer used to train the classifier.
  
      :return: The optimizer used to train the classifier.
      """
      return self._optimizer
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import logging
  import os
  from typing import List, Optional, Tuple, Union, TYPE_CHECKING
  import numpy
  import six
  from art import config
  from art.estimators.mxnet import MXEstimator
  from art.estimators.classification.classifier import ClassGradientsMixin, ClassifierMixin
  from art.utils import check_and_transform_label_format
label_desc: Use image node_id 4 for calling the MXClassifier obj's underlying member method code with example usage: obj.optimizer() and returns: self