S2S + M2M100 should be available in tokenization_auto (#10657)
S2S + M2M100 should be available in tokenization_auto (#10657)

* S2S + M2M100 should be available in tokenization_auto

* Requires sentencepiece

* SentencePiece for S2T as well :)
huggingface/transformers,huggingface/transformers,huggingface/transformers,huggingface/pytorch-transformers,huggingface/transformers