transformers safetensors llama text-generation sparse fp8 vllm arxiv:2301.00774 arxiv:2310.06927 arxiv:1911.01547 arxiv:2009.03300 arxiv:1905.07830 arxiv:1907.10641 arxiv:2110.14168 arxiv:2109.07958 autotrain_compatible text-generation-inference endpoints_compatible region:us