code: def setUp(self):
      self.target = chainer.Link()
      with self.target.init_scope():
          self.target.w = chainer.Parameter()
  
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 TestOptimizerHyperparameter obj's underlying member method code with example usage: obj.setUp() without return types