code: def setup(self):
      self.shape = (2, 2)
  
      t_shape = (self.shape[0],)
      t = numpy.random.randint(0, self.shape[1], t_shape)
      self.t = t.astype(self.t_dtype)
  
      if self.x_dtype == "float16":
          self.check_forward_options.update(
              {"rtol": 5e-3, "atol": 5e-3}
          )
          self.check_backward_options.update(
              {"rtol": 1e-2, "atol": 5e-3}
          )
          self.check_double_backward_options.update(
              {"rtol": 1e-2, "atol": 3e-1}
          )
  
imports: import numpy
  import chainer
  from chainer import functions
  import chainerx
  from chainerx_tests import dtype_utils
  from chainerx_tests import op_utils
label_desc: Use image node_id 1 for calling the TestSoftmaxCrossEntropy obj's underlying member method code with example usage: obj.setup() without return types