changed corresponding to the upstream

theano/gof/op.py

@@ -738,7 +738,7 @@ class PureOp(object):
             "own op, implement the R_op method." %
             (self, self.__class__.__name__))
 
-    def perform(self, node, inputs, output_storage):
+    def perform(self, node, inputs, output_storage, params=None):
         """
         Required: Calculate the function on the inputs and put the variables in
         the output storage. Return None.
@@ -771,7 +771,9 @@ class PureOp(object):
 
         """
         raise utils.MethodNotDefined(
-            "perform", type(self), self.__class__.__name__)
+            "perform", type(self), self.__class__.__name__,
+            "Did you used Theano flags mode=FAST_COMPILE?"
+            " You can use optimizer=fast_compile instead.")
 
     def do_constant_folding(self, node):
         """