code: def setUp(self):
      self.check_options = {}
      if self.dtype == numpy.float16:
          self.check_options = {"atol": 1e-4, "rtol": 1e-3}
  
imports: import unittest
  import numpy
  import chainer
  from chainer import backend
  from chainer import initializers
  from chainer import testing
label_desc: Use image node_id 1 for calling the TestIdentity obj's underlying member method code with example usage: obj.setUp() without return types