Remove last remaining tentacles.

theano/gradient.py

@@ -219,7 +219,7 @@ def Rop(f, wrt, eval_points):
                                  str(eval_point.type.ndim))
         except AttributeError:
             # wrt_elem and eval_point don't always have ndim like random type
-            # Tensor, Sparse and CudaNdArray have the ndim attribute
+            # Tensor, Sparse and GpuArray have the ndim attribute
             pass
 
     seen_nodes = OrderedDict()

theano/tests/test_flake8.py

@@ -74,8 +74,6 @@ whitelist_flake8 = [
     "scalar/tests/__init__.py",
     "sandbox/__init__.py",
     "sandbox/tests/__init__.py",
-    "sandbox/cuda/__init__.py",
-    "sandbox/cuda/tests/__init__.py",
     "sandbox/gpuarray/__init__.py",
     "sandbox/linalg/__init__.py",
     "sandbox/linalg/tests/__init__.py",