Don't pickle the function used with: a_theano_var.eval(...)

theano/gof/graph.py

@@ -424,6 +424,10 @@ class Variable(Node):
 
         return rval
 
+    def __getstate__(self):
+        d = self.__dict__.copy()
+        d.pop("_fn", None)
+        return d
     env = property(env_getter, env_setter, env_deleter)
 
 

theano/gof/tests/test_graph.py

+import pickle
 import unittest
 
 from theano import tensor
@@ -292,7 +293,6 @@ class TestIsSameGraph(unittest.TestCase):
             debug=False)
 
 
-
 ################
 # eval         #
 ################
@@ -305,3 +305,6 @@ def test_eval():
     result = z.eval({x : 1., y : 2.})
 
     assert result == 3.
+
+    # We don't want to pickle the tmp function.
+    assert not hasattr(pickle.loads(pickle.dumps(z)), '_fn')