Added __props__ in class TrueDot

theano/sparse/basic.py

@@ -3047,18 +3047,14 @@ class TrueDot(gof.op.Op):
     # TODO
     # Simplify code by splitting into DotSS and DotSD.
     
-    def __init__(self, grad_preserves_dense=True):
-        self.grad_preserves_dense = grad_preserves_dense
-
-    def __eq__(self, other):
+    __props__ = ()
     # The grad_preserves_dense attribute doesn't change the
     # execution behavior.  To let the optimizer merge nodes with
     # different values of this attribute we shouldn't compare it
     # here.
-        return type(self) == type(other)
 
-    def __hash__(self):
-        return hash(type(self))
+    def __init__(self, grad_preserves_dense=True):
+        self.grad_preserves_dense = grad_preserves_dense
 
     def __ne__(self, other):
         return not (self == other)