code: def setUp(self):
      check_forward_options = {"atol": 1e-3, "rtol": 1e-3}
      check_backward_options = {"atol": 1e-3, "rtol": 1e-3}
      if self.dtype == numpy.float32:
          check_backward_options = {"atol": 1e-2, "rtol": 1e-2}
      self.check_forward_options = check_forward_options
      self.check_backward_options = check_backward_options
  
imports: import numpy
  from chainer import functions
  from chainer import testing
label_desc: Use image node_id 1 for calling the TestDecorrelatedBatchNormalization obj's underlying member method code with example usage: obj.setUp() without return types