transformers

fb2b45e5 - add in layer gpt2 tokenizer (#20421)

add in layer gpt2 tokenizer (#20421) * add minimal working gpt2 tokenizer * graph mode and output equivalence tests working * not today tensorflow. serialization test passing! * fix style, documentation, docstrings and all that jazz * passing consistency checks * move keras nlp to tf dependencies * fix tf modeling utils and gpt2 attention to enable compiling * fix (I hope) keras nlp dependencies * rever changes on generation * remove debug prints * remove redundant tf dummy objects * add from config, get config and max length settings to address review * let flake ignore the error on distillation you are welcome * test from config * add padding test * address sgugger review