transformers safetensors llama text-generation sparse dataset:cerebras/SlimPajama-627B arxiv:2301.00774 arxiv:2405.03594 arxiv:2009.03300 arxiv:1905.07830 arxiv:1907.10641 arxiv:1911.01547 arxiv:2109.07958 arxiv:2110.14168 arxiv:2107.03374 base_model:meta-llama/Llama-2-7b-hf base_model:finetune:meta-llama/Llama-2-7b-hf autotrain_compatible text-generation-inference endpoints_compatible region:us