code: def setUp(self):
      self.check_forward_options = {"atol": 1e-3, "rtol": 1e-2}
      if self.dtype == numpy.float16:
          self.check_forward_options.update({"rtol": 5e-2})
      self.check_backward_options = {"atol": 5e-3, "rtol": 5e-2}
      self.check_double_backward_options = {"atol": 5e-3, "rtol": 5e-2}
      self.skip_double_backward_test = True
  
imports: import numpy
  import chainer.functions
  from chainer import testing
  from chainer.testing import backend
label_desc: Use image node_id 1 for calling the TestNStepRNN obj's underlying member method code with example usage: obj.setUp() without return types