https://github.com/openai/gpt-2
https://gpt2.apps.allenai.org

2022
https://habr.com/ru/post/652369/
2020
https://jalammar.github.io/illustrated-gpt2/
    https://habr.com/ru/post/490842/
2019
https://www.infoq.com/presentations/nlp-practitioners
https://habr.com/ru/post/440564/