th> a=torch.range(1,5)
                                                                      [0.0001s]
th> a
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[torch.DoubleTensor of size 5]

                                                                      [0.0002s]
th> a=torch.range(1,5,2)
                                                                      [0.0001s]
th> a
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[torch.DoubleTensor of size 3]