transformers pytorch safetensors t5 text2text-generation en dataset:facebook/asset dataset:wi_locness dataset:GEM/wiki_auto_asset_turk dataset:discofuse dataset:zaemyung/IteraTeR_plus dataset:jfleg dataset:grammarly/coedit arxiv:2305.09857 license:cc-by-nc-4.0 autotrain_compatible text-generation-inference endpoints_compatible region:us