code: def test_pickle(self):
      # Test pickle and unpickle:
      filename = "test_pickle.h5"
      ActivationDefence._pickle_classifier(self.classifier, filename)
      loaded = ActivationDefence._unpickle_classifier(filename)
  
      np.testing.assert_equal(
          self.classifier._clip_values, loaded._clip_values
      )
      self.assertEqual(
          self.classifier._channels_first, loaded._channels_first
      )
      self.assertEqual(self.classifier._use_logits, loaded._use_logits)
      self.assertEqual(
          self.classifier._input_layer, loaded._input_layer
      )
  
      ActivationDefence._remove_pickle(filename)
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import logging
  import unittest
  from keras.preprocessing.image import ImageDataGenerator
  import numpy
  from art.data_generators import KerasDataGenerator
  from art.defences.detector.poison import ActivationDefence
  from art.utils import load_mnist
  from art.visualization import convert_to_rgb
  from tests.utils import master_seed
label_desc: Use image node_id 14 for calling the TestActivationDefence obj's underlying member method code with example usage: obj.test_pickle() without return types