transformers

e57ba2b7 - Fix SequenceBiasLogitsProcessor edge cases: token id 0 and prefix equal to context (#49117)

Fix SequenceBiasLogitsProcessor edge cases: token id 0 and prefix equal to context (#49117) * Fix SequenceBiasLogitsProcessor edge cases: token id 0 and prefix equal to context * Address review: reuse prefix_length, drop PR-specific test comments --------- Co-authored-by: Luca Luo <zix7622@163.com>