pytorch

fc31b3a1 - Allow existing "Python RAII guards" to be used as context managers (#102579)

Allow existing "Python RAII guards" to be used as context managers (#102579) This PR adds a `py_context_manager_DEPRECATED` that converts a C++ RAII guard to an object that may be either used as Python context manager or as a "Python RAII guard". We don't convert all of them to Python context manager only due to BC reasons; people in OSS and internally actually rely on these APIs and I don't want to break them. We are justified in breaking BC if we wanted to, but it seemed like too much work for not a lot of gain. The API is postfixed with "DEPRECATED" to indicate that people should really use `py_context_manager` (converts C++ RAII guard to Python context manager) instead. Test Plan: - this PR converts all PyTorch usages of _AutoDispatchBelowAutograd to context manager. I can do the rest in follow-ups. Pull Request resolved: https://github.com/pytorch/pytorch/pull/102579 Approved by: https://github.com/bdhirsh, https://github.com/albanD