pytorch

b7243f7c - [functorch] Macro-guard the custom_vjp prototype from windows (pytorch/functorch#699)

[functorch] Macro-guard the custom_vjp prototype from windows (pytorch/functorch#699) I think libtorch_python does not have visibility macros set correctly for windows, so this PR guards our custom_vjp implementation (which relies on some C++ bits from libtorch_python). We'll either fix libtorch_python or actually write a better version of custom_vjp in the future.