reallow ndarray to be passed to Shape.make_node

theano/tensor/basic.py

@@ -1444,11 +1444,13 @@ class Shape(Op):
     def __str__(self):
         return self.__class__.__name__
     def make_node(self, x):
-        if not isinstance(x, Variable):
-            raise TypeError('x must be Variable whose value have a shape attribute', x)
         #Must work for all type that have a shape attribute.
         #This will fail at execution time.
-        #x = as_tensor_variable(x)
+        x = as_tensor_variable(x)
+        #Each type variable should implement their .shape attribute
+        #and have the fct infer_shape() implemented in the op that convert
+        #the type to TensorVariable to have the optimization working
+        #correctly.
         return Apply(self, [x], [lvector()])
     def perform(self, node, (x, ), (out, )):
         out[0] = theano._asarray(x.shape, dtype = 'int64')