code: def test_share_states(self):
      model = L.Linear(2, 2)
      opt_a = optimizers.RMSprop()
      opt_a.setup(model)
      arrays = async_.share_states_as_shared_arrays(opt_a)
      opt_b = optimizers.RMSprop()
      opt_b.setup(copy.deepcopy(model))
      # In Chainer v2, a model cannot be set up by two optimizers or more.
  
      opt_c = optimizers.RMSprop()
      opt_c.setup(copy.deepcopy(model))
  
      """
          Removed the tests by assert_different_pointers
          since they are trivial now.
          """
  
      async_.set_shared_states(opt_b, arrays)
      async_.set_shared_states(opt_c, arrays)
  
      def assert_same_pointers(a, b):
          a = a.target
          b = b.target
          for param_name, param_a in a.namedparams():
              param_b = dict(b.namedparams())[param_name]
              state_a = param_a.update_rule.state
              state_b = param_b.update_rule.state
              self.assertTrue(state_a)
              self.assertTrue(state_b)
              for state_name, state_val_a in state_a.items():
                  state_val_b = state_b[state_name]
                  self.assertTrue(isinstance(state_val_a, np.ndarray))
                  self.assertTrue(isinstance(state_val_b, np.ndarray))
                  self.assertEqual(
                      state_val_a.ctypes.data, state_val_b.ctypes.data
                  )
  
      assert_same_pointers(opt_a, opt_b)
      assert_same_pointers(opt_a, opt_c)
  
imports: import multiprocessing
  import os
  import signal
  import sys
  import unittest
  import warnings
  import chainer
  import chainer.links
  from chainer import optimizers
  import copy
  import numpy
  import chainerrl
  from chainerrl.misc import async_
label_desc: Use image node_id 5 for calling the TestAsync obj's underlying member method code with example usage: obj.test_share_states() without return types