Porting fairseq wmt19 translation system to transformers

1. 1Prepare the Fairseq model and its support files
2. 2Convert the model to Transformers format
3. 3Port the tokenizer and its encoder to Transformers
4. 4Port the core translation functionality, including weights and configuration
5. 5Test the ported model manually and using test coverage

NLP engineers and researchers can benefit from this tutorial to port their Fairseq models to Transformers, enabling easier integration and deployment

💡 Porting Fairseq models to Transformers enables easier integration and deployment, and can be done by following a series of steps

Port Fairseq WMT19 to Transformers in a few steps!