code: def setUp(self):
      self.target = SimpleChain()
  
imports: import pickle
  import unittest
  import numpy
  import six
  import chainer
  from chainer import functions
  from chainer import optimizers
  from chainer import testing
label_desc: Use image node_id 1 for calling the TestOptimizerHooks obj's underlying member method code with example usage: obj.setUp() without return types