就是抽样
Variable containing:
7
[torch.LongTensor of size 1x1]
Variable containing:
7
[torch.LongTensor of size 1x1]
Variable containing:
7
[torch.LongTensor of size 1x1]
Variable containing:
7
[torch.LongTensor of size 1x1]
可见是按b的值也就是概率选的