code: def setUp(self):
      self.y = numpy.random.uniform(-1, 1, (4, 3)).astype(self.dtype)
      self.z = numpy.random.uniform(-1, 1, (4, 2)).astype(self.dtype)
      if self.reduce == "half_squared_sum":
          gloss_shape = ()
      else:
          gloss_shape = (3, 2)
      self.gloss = numpy.random.uniform(-1, 1, gloss_shape).astype(
          self.dtype
      )
      self.ggy = numpy.random.uniform(-1, 1, (4, 3)).astype(self.dtype)
      self.ggz = numpy.random.uniform(-1, 1, (4, 2)).astype(self.dtype)
  
imports: 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 TestCrossCovariance obj's underlying member method code with example usage: obj.setUp() without return types