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