transformers

9d37c56b - [Reformer] - Cache hidden states and buckets to speed up inference (#5578)

[Reformer] - Cache hidden states and buckets to speed up inference (#5578) * fix merge rebase * add intermediate reformer code * save intermediate caching results * save intermediate * save intermediate results * save intermediate * upload next step * fix generate tests * make tests work * add named tuple output * Apply suggestions from code review * fix use_cache for False case * fix tensor to gpu * fix tensor to gpu * refactor * refactor and make style