Fix version number.

theano/tensor/blas.py

@@ -443,8 +443,7 @@ class GemmRelated(Op):
             self.end_switch_typenum), '')
 
     def build_gemm_version(self):
-        return ()
-        return (4,)
+        return (5,)
 
 class Gemm(GemmRelated):
     """In-place version of matrix-matrix multiplication (with accumulation):