code: def test_new_pickle(self):
      self.create()
      pickled_opt = pickle.dumps(self.optimizer)
  
      x = chainer.Variable(np.array(5.0, dtype=np.float32))
      self.optimizer.update(self.target, x)
      w_post = np.copy(self.target.w.data)
      # Pickle has saved a copy of the target
      opt = pickle.loads(pickled_opt)
      opt.update(opt.target, x)
      pickled_w_post = np.copy(opt.target.w.data)
  
      self.assertEqual(w_post, pickled_w_post)
  
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 4 for calling the TestOptimizerPickable obj's underlying member method code with example usage: obj.test_new_pickle() without return types