code: def testWriteOutAndReloadSGD(self):
      optimizer_class = dp_optimizer.make_gaussian_optimizer_class(
          tf.keras.optimizers.legacy.SGD
      )
      self._test_write_out_and_reload(optimizer_class)
  
imports: import os
  import unittest
  from absl.testing import parameterized
  import numpy
  import tensorflow
  from tensorflow import estimator
  from tensorflow.compat.v1 import estimator
  from tensorflow_privacy.privacy.dp_query import gaussian_query
  from tensorflow_privacy.privacy.optimizers import dp_optimizer
label_desc: Use image node_id 16 for calling the DPOptimizerTest obj's underlying member method code with example usage: obj.testWriteOutAndReloadSGD() without return types