[Bug] Passing other: Tensor to LinearOperator.to.

[j-wilson]

🐛 Bug

torch.Tensor.to allows the user to provide a reference tensor in lieu of explicitly passing device and dtype; however, this logic seems to be missing from LinearOperator.to.

To reproduce

A = DiagLinearOperator(torch.rand(3, dtype=torch.float64))
B = A.to(torch.rand(3, dtype=torch.float32))
B.dtype
> torch.float64

Expected Behavior

The code should either follow the same convention as torch.Tensor.to or raise an exception.