code: def setUp(self):
      self.x0 = numpy.random.uniform(-1, 1, (5, 10)).astype(
          numpy.float32
      )
      self.x1 = numpy.random.uniform(-1, 1, (5, 10)).astype(
          numpy.float32
      )
      self.t = numpy.random.randint(0, 2, (5,)).astype(numpy.int32)
  
imports: import math
  import unittest
  import numpy
  import six
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 1 for calling the TestContrastiveInvalidReductionOption obj's underlying member method code with example usage: obj.setUp() without return types