code: def setUp(self):
      self.check_forward_options = {"atol": 1e-7, "rtol": 1e-7}
      if self.dtype == numpy.float16:
          self.check_backward_options = {"atol": 3e-3, "rtol": 1e-2}
          self.check_double_backward_options = {
              "atol": 3e-3,
              "rtol": 1e-2,
          }
      else:
          self.check_backward_options = {"atol": 1e-4, "rtol": 1e-3}
          self.check_double_backward_options = {
              "atol": 1e-4,
              "rtol": 1e-3,
          }
  
file_path: chainer/tests/chainer_tests/functions_tests/math_tests/test_exponential.py
imports: import numpy
  from chainer import functions
  from chainer import testing
  from chainer import utils
label_desc: Use image node_id 1 for calling the TestExp obj's underlying member method code with example usage: obj.setUp() without return types