code: def test_forward_cpu(self):
      self.check_forward(self.x, self.y)
  
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 3 for calling the TestForget obj's underlying member method code with example usage: obj.test_forward_cpu() without return types