transformers

af554e9d - Remove roberta dependency from longformer fast tokenizer (#19501)

Remove roberta dependency from longformer fast tokenizer (#19501) * remove roberta fast tokenizer dependency * fix flake8 * Update src/transformers/models/longformer/tokenization_longformer_fast.py Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com> Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>