code: def setUp(self):
      self.check_forward_options.update({"atol": 1e-2, "rtol": 2e-3})
      self.check_backward_options.update({"atol": 1e-2, "rtol": 1e-2})
      self.check_double_backward_options.update(
          {"atol": 1e-2, "rtol": 1e-2}
      )
  
imports: import unittest
  import numpy
  import six
  from chainer import functions
  from chainer import testing
  from chainer.testing import attr
  from chainer import utils
label_desc: Use image node_id 1 for calling the TestAverageOverflowingSum obj's underlying member method code with example usage: obj.setUp() without return types