code: def forward_preprocess(self, args):
      assert isinstance(args.link, chainer.Link)
      assert isinstance(args.forward_name, str)
      assert isinstance(args.args, tuple)
      assert isinstance(args.kwargs, dict)
      assert isinstance(str(args), str)
      assert isinstance(repr(args), str)
      self.forward_preprocess_args.append((_process_time(), args))
  
imports: import time
  import unittest
  import numpy
  import chainer
  from chainer import testing
label_desc: Use image node_id 4 for calling the MyLinkHook obj's underlying member method code with example usage: obj.forward_preprocess(args) without return types