transformers pytorch safetensors llama text-generation merge mix cot dataset:mlabonne/guanaco-llama2-1k arxiv:1903.00161 arxiv:2009.03300 arxiv:1803.05457 arxiv:1905.07830 arxiv:2109.07958 arxiv:1907.10641 arxiv:2110.14168 license:llama2 autotrain_compatible text-generation-inference region:us