Copy the elements of the given tensor. The number of elements must match, but the sizes might be different. 

> x = torch.Tensor(4):fill(1)
> y = torch.Tensor(2,2):copy(x)
> print(x)

 1
 1
 1
 1
[torch.Tensor of dimension 4]

> print(y)

 1  1
 1  1
[torch.Tensor of dimension 2x2]

If a different type of tensor is given, then a type conversion occurs, which, of course, might result in lost of precision.