class_docstr: This class tests the Detector Classifier.
class_docstr_tok: ["This","class","tests","the","Detector","Classifier","."]
code: def tearDown(self):
      self.x_train_mnist = np.reshape(
          self.x_train_mnist, (self.x_train_mnist.shape[0], 28, 28, 1)
      ).astype(np.float32)
      self.x_test_mnist = np.reshape(
          self.x_test_mnist, (self.x_test_mnist.shape[0], 28, 28, 1)
      ).astype(np.float32)
      super().tearDown()
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import os
  import tempfile
  import logging
  import unittest
  import numpy
  import torch
  import torch.nn
  import torch.optim
  from art.estimators.classification.pytorch import PyTorchClassifier
  from art.estimators.classification.detector_classifier import DetectorClassifier
  from tests.utils import TestBase, get_image_classifier_pt
label_desc: Use image node_id 3 for calling the TestDetectorClassifier obj's underlying member method code with example usage: obj.tearDown() without return types