code: def test_original_unaffected_by_function_addition(self):
      with self.check_unchanged(self.original_link, self.x):
          with self.link.init_scope():
              self.link.f100 = self.f100
  
imports: import numpy
  import unittest
  import chainer
  from chainer.backends.cuda import to_cpu
  from chainer.function import Function
  from chainer import testing
  from chainer.testing import attr
  from chainercv.links import PickableSequentialChain
  from chainercv.utils.testing import ConstantStubLink
label_desc: Use image node_id 4 for calling the TestCopiedPickableSequentialChain obj's underlying member method code with example usage: obj.test_original_unaffected_by_function_addition() without return types