code: def test_pickle(self):
      v = tt.vector()
      func = theano.gof.FunctionGraph([v], [v + 1])
  
      s = pickle.dumps(func)
      pickle.loads(s)
  
file_path: Theano/theano/gof/tests/test_fg.py
imports: from __future__ import absolute_import, print_function, division
  import os
  import pickle
  import unittest
  from nose.plugins.skip import SkipTest
  import theano
  from theano.compat import PY3
  from theano.gof import CachedConstantError, FunctionGraph
  from theano import tensor
label_desc: Use image node_id 3 for calling the TFunctionGraph obj's underlying member method code with example usage: obj.test_pickle() without return types