code: def setUp(self):
      self.check_forward_options = {"atol": 1e-3, "rtol": 1e-3}
      self.check_backward_options = {"atol": 5e-3, "rtol": 1e-3}
      if self.dtype == numpy.float32:
          self.check_backward_options = {"atol": 5e-2, "rtol": 5e-2}
  
imports: import contextlib
  import os
  import tempfile
  import unittest
  import numpy
  import chainer
  from chainer import links
  from chainer import testing
label_desc: Use image node_id 1 for calling the DecorrelatedBatchNormalizationTest obj's underlying member method code with example usage: obj.setUp() without return types