transformers pytorch llama text-generation en dataset:Open-Orca/OpenOrca dataset:openchat/openchat_sharegpt4_dataset dataset:LDJnr/Puffin dataset:ehartford/samantha-data dataset:OpenAssistant/oasst1 dataset:jondurbin/airoboros-gpt4-1.4.1 arxiv:2306.02707 arxiv:2305.14314 license:llama2 autotrain_compatible text-generation-inference endpoints_compatible region:us