Handle direction_hint when unpickling old ops

theano/sandbox/cuda/blas.py

@@ -1603,6 +1603,8 @@ class GpuConv(GpuOp):
             self.imshp = None
         if not hasattr(self, "max_threads_dim0"):
             self.max_threads_dim0 = None
+        if not hasattr(self, "direction_hint"):
+            self.direction_hint = None
 
     def __hash__(self):
         # don't use hash(self.version) as hash(-1)==-2 and

theano/tensor/nnet/conv.py

@@ -569,6 +569,7 @@ class ConvOp(OpenMPOp):
 
     def __setstate__(self, d):
         super(ConvOp, self).__setstate__(d)
+        self.direction_hint = d.get("direction_hint", None)
         self._rehash()
 
     def _rehash(self):