fix fusion test on the gpu.

theano/tensor/tests/test_opt.py

@@ -786,7 +786,7 @@ class test_fusion(unittest.TestCase):
         fail3=[]
         fail4=[]
         for id, [g, sym_inputs, val_inputs, nb_elemwise, answer, out_dtype] in enumerate(cases):
-            if gpu and out_dtype!='float32':
+            if gpu and (out_dtype!='float32' or any(i.dtype != 'float32' for i in g.owner.inputs)):
                 print "Skip test %d as the gpu code currently support only float32" % id
                 continue
             print "new cases", id