Doc for functions at FUNCTIONS.H

Hi, torch. Recently I am using APIs at FUNCTIONS.H. File Functions.h — PyTorch main documentation in python to optimize my ml code, such as torch._foreach_add() to do some tensor list operation.
I am wondering is there a documentation to illustrate these APIs and Will they be maintained as torch keeps updating, because I want to use them in production and want to make sure their stability. Thanks

The preceding underscore indicates that the method is internal and their API can change, so keep this in mind if you want to use it in your production code.