code: def setUp(self):
      if self.dtype == numpy.float16:
          self.check_forward_options = {"atol": 1e-2, "rtol": 1e-2}
          self.check_backward_options = {"atol": 1e-2, "rtol": 1e-2}
          self.check_double_backward_options = {
              "atol": 1e-2,
              "rtol": 1e-2,
          }
      else:
          self.check_forward_options = {"atol": 1e-3, "rtol": 1e-3}
          self.check_backward_options = {"atol": 1e-3, "rtol": 1e-3}
          self.check_double_backward_options = {
              "atol": 1e-3,
              "rtol": 1e-3,
          }
  
      low, high = self.x_range
      self._x = numpy.random.uniform(
          low=low, high=high, size=self.shape
      ).astype(self.dtype)
  
file_path: chainer/tests/chainer_tests/functions_tests/math_tests/test_zeta.py
imports: import unittest
  import numpy
  import chainer
  import chainer.functions
  from chainer import testing
label_desc: Use image node_id 1 for calling the TestZeta obj's underlying member method code with example usage: obj.setUp() without return types