code: def test_call_cpu(self):
      self._test_call(gpu=-1)
  
imports: import chainer.functions
  from chainer import testing
  from chainer.testing import attr
  import basetest_state_action_q_function
  import chainerrl
label_desc: Use image node_id 2 for calling the TestFCLateActionSAQFunction obj's underlying member method code with example usage: obj.test_call_cpu() without return types