dataset of Helsinki-NLP/opus-mt-en-zh
Hi, thanks for your model. I have two questions of the train datasets of opus-mt-en-zh.

https://github.com/Helsinki-NLP/Tatoeba-Challenge/blob/master/data/README-v2021-08-07.md
English - Chinese eng-zho 10390 | 43075 | 129323178
Middle English (1100-1500) - Chinese enm-zho

In this website, there are two datasets from en to zh. Which is the dataset of opus-mt-en-zh?
When fine-tuning the model, does it need to add ">>cmn_Hans<< " before train_src?
The README here mentions `eng-zho`, if I'm not mistaken: https://huggingface.co/Helsinki-NLP/opus-mt-en-zh<|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/master/CONTRIBUTING.md) are likely to be ignored.