Model parallelism for m2m100
### Model description

The translation model m2m100 proposed by Facebook is too huge to train using DDP, is there any open solution for model parallelism of m2m100, just like GPT2? Thank you.

### Open source status

- [X] The model implementation is available
- [X] The model weights are available

### Provide useful links for the implementation

_No response_
We recommend using accelerate to achieve parallelisation now: https://github.com/huggingface/accelerate