Added corrections to builders.py

theano/compile/builders.py

@@ -65,7 +65,6 @@ class OpFromGraph(gof.Op):
         fn = function([x, y, z], [e2])
 
     """
-    __props__ = ()
 
     def __init__(self, inputs, outputs, **kwargs):
         if not isinstance(outputs, list):
@@ -102,6 +101,14 @@ class OpFromGraph(gof.Op):
         self.input_types = [input.type for input in inputs]
         self.output_types = [output.type for output in outputs]
 
+    def __eq__(self, other):
+        # TODO: recognize a copy
+        return self is other
+
+    def __hash__(self):
+        # TODO: use internal variables in hash
+        return hash(type(self))
+
     def make_node(self, *inputs):
         for input, type in zip(inputs, self.input_types):
             if not type == input.type: