code: def setUp(self):
      # Assumption l < u
      self.l = numpy.random.uniform(0, 1)
      self.u = numpy.random.uniform(0, 1)
      if self.l >= self.u:
          self.l, self.u = self.u, self.l
  
      if self.dtype == numpy.float16:
          self.check_forward_options = {"atol": 1e-4, "rtol": 1e-3}
          self.check_backward_options = {"atol": 5e-4, "rtol": 5e-3}
          self.check_double_backward_options = {
              "atol": 5e-4,
              "rtol": 5e-3,
          }
  
      # cast self.r later because check_backward casts only x
      self.r = numpy.random.uniform(self.l, self.u, self.shape)
  
file_path: chainer/tests/chainer_tests/functions_tests/activation_tests/test_rrelu.py
imports: import unittest
  import numpy
  import chainer
  from chainer import cuda
  from chainer import functions
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 1 for calling the TestRReLU obj's underlying member method code with example usage: obj.setUp() without return types