code: def setUp(self):
      self.s = numpy.random.uniform(-1, 1, self.shape).astype(
          self.dtype
      )
      self.i = numpy.array([0, 1, 0], numpy.int32)
      x_shape = (len(self.i), self.shape[-1])
      self.x = numpy.random.uniform(-1, 1, x_shape).astype(self.dtype)
      self.gt = numpy.random.uniform(-1, 1, self.shape).astype(
          self.dtype
      )
  
imports: import unittest
  import numpy
  import chainer
  from chainer import backend
  from chainer import cuda
  from chainer import testing
  from chainer.testing import attr
  import thin_stack
label_desc: Use image node_id 1 for calling the TestThinStackSet obj's underlying member method code with example usage: obj.setUp() without return types