lua中特殊用法

th> a=torch.zeros(,)
                                                                      [.0001s]
th> a

[torch.DoubleTensor of size 1x5]

                                                                      [.0001s]
th> a[{,floor}]=
                                                                      [.0001s]
th> a

[torch.DoubleTensor of size 1x5]

                                                                      [.0001s]
th> a[{,ceil}]=0.5
                                                                      [.0001s]
th> a
 0.5000  0.5000  0.5000  0.5000  0.5000
[torch.DoubleTensor of size 1x5]