code: def setUp(self):
      self.x = numpy.random.uniform(-1, 1, (10, 5)).astype(self.dtype)
      self.gy = numpy.random.uniform(-1, 1, (10, 5)).astype(self.dtype)
      self.ggx = numpy.random.uniform(-1, 1, (10, 5)).astype(self.dtype)
      self.check_double_backward_options = {}
      if self.dtype == numpy.float16:
          self.check_double_backward_options = {
              "atol": 5e-3,
              "rtol": 5e-2,
          }
  
imports: import unittest
  import numpy
  import pytest
  import chainer
  from chainer import backend
  from chainer.backends import _cpu
  from chainer.backends import cuda
  from chainer import functions
  from chainer import testing
  import chainerx
label_desc: Use image node_id 1 for calling the CopyTestBase obj's underlying member method code with example usage: obj.setUp() without return types