Make TorchScript Preserve Fully Qualified Class Name for Python Exceptions (#70339)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70339
When a python program is translated to TorchScript, the python exception type is dropped. This makes users's life hard when they need to categorize errors based more than only exception message.
Here we make the change so when we raise a python exception, we record the fully qualified class name for the exception. Later on when the TorchScript is interpreted, a special exception CustomJITException is thrown. User can get the python class name from CustomJITException::getPythonClassName .
Note that, this diff does not customize the mapping from C++ exception to Python exception. It's left to the users to do whatever mapping they want.
Code under scripts/shunting are just my own experimental code. I can split them out if requested.
ghstack-source-id: 146221879
Test Plan: buck test mode/opt //caffe2/test:jit
Reviewed By: gmagogsfm
Differential Revision: D33282878
fbshipit-source-id: 910f67a764519f1053a48589d1a34df69001525d
