Remove view_map, as the output never seems to be aliased to an input.

theano/tensor/elemwise.py

@@ -872,10 +872,6 @@ class CAReduce(Op):
             self.axis = tuple(self.axis)
         self.ufunc = numpy.frompyfunc(scalar_op.impl, 2, 1)
 
-        # CAReduce output views input when reducing scalars
-        # See ticket #417: http://www.pylearn.org/theano/trac/ticket/417
-        self.view_map = {0: [0]}
-
     def _output_dtype(self, input_dtype):
         return input_dtype