[Feature Request] Tracking torch namespace function coverage

[Max Balandat]

🚀 Feature Request

Currently, there are a number of functions in the torch namespace that are not registered to dispatch to LinearOperator. Closing this gap will be necessary to make LinearOperator true drop-in replacement for torch.Tensor.

The purpose of this issue is to track which functions are currently not registered, and prioritize the work on closing these gaps. I will try to keep this issue updated with things that come up and cross out things as we close them out.

Missing functions

• torch.linalg.solve_triangular - #29
• torch.linalg.cholesky_ex
• torch.isclose
• ...