Solved by ptrblck in post #4 
              
              
                Ah ok, I understand. 
Well you could use 
a = torch.DoubleTensor(10)
a = a.type(torch.cuda.FloatTensor)

, if you would like to have a single command. 
I tried to time it with torch.cuda.synchronize() and got mixed results. 
Currently my GPU is busy, so the timing is most likely useless in this stat…