mean函数

求平均值

th> a=torch.zeros(,)
                                                                      [.0002s]
th> a

[torch.DoubleTensor of size 1x3]

                                                                      [.0003s]
th> a[{,}]=
                                                                      [.0001s]
th> a[{,}]=
                                                                      [.0001s]
th> a[{,}]=
                                                                      [.0000s]
th> a

[torch.DoubleTensor of size 1x3]

                                                                      [.0003s]
th> b=a:mean()
                                                                      [.0001s]
th> b