Solved by albanD in post #2 
              
              
                Hey! 
So the way to go is: 


function.conv_transpose2d calls into torch.conv_transpose2d.

torch.conv_transpose2d is nowhere in python files Search · conv_transpose2d · GitHub meaning that it comes from c++
All C++ functions are defined in a nice yaml file: pytorch/native_functions.yaml at master ·…