code: def setUp(self):
      self.x = numpy.random.uniform(-1, 1, (3, 4)).astype(numpy.float32)
      self.y = numpy.random.uniform(-1, 1, (3, 4)).astype(numpy.float32)
      self.gz0 = numpy.random.uniform(-1, 1, (3, 4)).astype(
          numpy.float32
      )
      self.gz1 = numpy.random.uniform(-1, 1, (3, 4)).astype(
          numpy.float32
      )
      self.ggx = numpy.random.uniform(-1, 1, (3, 4)).astype(
          numpy.float32
      )
      self.ggy = numpy.random.uniform(-1, 1, (3, 4)).astype(
          numpy.float32
      )
  
      self.check_backward_options = {"atol": 5e-4, "rtol": 5e-3}
      self.check_double_backward_options = {"atol": 5e-3, "rtol": 5e-2}
  
imports: import functools
  import unittest
  import numpy
  import six
  import chainer
  from chainer import cuda
  from chainer import functions
  from chainer import gradient_check
  from chainer import links
  from chainer import testing
  from chainer.testing import attr
  from chainer import variable
label_desc: Use image node_id 1 for calling the TestForget obj's underlying member method code with example usage: obj.setUp() without return types