case for host_from_gpu added.

theano/sandbox/cuda/basic_ops.py

@@ -34,10 +34,12 @@ _logger = logging.getLogger(_logger_name)
 
 
 def as_cuda_ndarray_variable(x):
+    if x.owner and isinstance(x.owner.op, HostFromGpu):
+        return x.owner.inputs[0]
     if \
-            x.owner is not None and \
+            x.owner and \
             isinstance(x.owner.op, GpuFromHost) and \
-            hasattr(x.owner.inputs[0].owner, 'op') and \
+            x.owner.inputs[0].owner and \
             isinstance(x.owner.inputs[0].owner.op, HostFromGpu):
         return x.owner.inputs[0].owner.inputs[0]
     if hasattr(x, '_as_CudaNdarrayVariable'):