Given two tensor:

```
A = torch.tensor([[0, 2],
[1, 2],
[2, 0],
[2, 1],
[2, 3],
[3, 2],
[1, 8],
[8, 1]])
B = torch.tensor([[0, 3],
[1, 8],
[8, 1]])
```

How two get the intersection of two tensors, so that I can get `tensor([[1,8],[8,1]])`

?