quintic/codegen-diff-2B-gptj

This is a conversion of https://huggingface.co/CarperAI/diff-codegen-2b-v2 into GPT-J implementation via the script https://gist.github.com/moyix/7896575befbe1b99162ccfec8d135566

For details, please refer to Carper's model card. Anyone can do this conversion easily. Uploaded here simply for easy access without moving stuff back-and-forth.