code: def setUp(self):
      self.x = numpy.random.uniform(-1, 1, self.shape).astype(
          self.dtype
      )
      # 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
      self.r = numpy.random.uniform(
          self.l, self.u, self.x.shape
      ).astype(self.x.dtype)
  
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 TestRReLUR obj's underlying member method code with example usage: obj.setUp() without return types