code: def setUp(self):
      self.x_data = numpy.random.uniform(-1, 1, self.in_shape).astype(
          self.dtype
      )
      self.t_data = numpy.random.randint(0, 2, self.out_shape).astype(
          numpy.int32
      )
      self.gy_data = numpy.random.uniform(-1, 1, self.out_shape).astype(
          self.dtype
      )
      self.ggx_data = numpy.random.uniform(-1, 1, self.in_shape).astype(
          self.dtype
      )
      self.check_backward_options = {"atol": 0.01, "rtol": 0.01}
      if self.dtype == numpy.float16:
          self.check_backward_options = {"atol": 0.1, "rtol": 0.1}
  
imports: import unittest
  import numpy
  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 TestSelectItem obj's underlying member method code with example usage: obj.setUp() without return types