transformers safetensors llama text-generation conversational dataset:princeton-nlp/prolong-data-64K arxiv:2410.02660 base_model:meta-llama/Meta-Llama-3-8B-Instruct base_model:finetune:meta-llama/Meta-Llama-3-8B-Instruct license:llama3 autotrain_compatible text-generation-inference endpoints_compatible region:us