[Rag] Fix wrong usage of `num_beams` and `bos_token_id` in Rag Sequence generation (#7386)
[Rag] Fix wrong usage of `num_beams` and `bos_token_id` in Rag Sequence generation (#7386)

* fix_rag_sequence

* add second bug fix
huggingface/transformers,huggingface/transformers,huggingface/pytorch-transformers,huggingface/transformers,huggingface/transformers