Convenience method of transpose() for 2D tensors. The given tensor must be 2 dimensional. Swap dimensions 1 and 2.

> x = torch.Tensor(3,4):zero()
> x:select(2,3):fill(7)
> y = x:t()
> print(y)

 0  0  0
 0  0  0
 7  7  7
 0  0  0
[torch.Tensor of dimension 4x3]

> print(x)

 0  0  7  0
 0  0  7  0
 0  0  7  0
[torch.Tensor of dimension 3x4]