I guess the bad news is there isn’t.
It’s still there for python functions (and those were much more common in the old days), but they aren’t exposed for the ATen specified functions.
The longer story is this, take a compiled torch master tree to follow along:

Let’s take torch.mm as an example.

torch/csrc/autograd/generated/ has the autogenerated Autograd functions.
In python_functions.cpp, you can see the *Backward Python classes being created without much functionality (addClass is at the top, and then it is used addClass below.
The wrapped C-class is MmBackward from Functions.h. There you can see that self_ and mat2_ are members that you’d be interested in.
But back in python_functions.cpp, addClass doesn’t do it (and it would need to get a list of saved variables to expose, could be tricky) - that would be easier if Functions.cpp had a list or something.

Best regards
Thomas