transformers safetensors mistral text-generation nm-vllm marlin int4 conversational arxiv:2210.17323 base_model:teknium/OpenHermes-2.5-Mistral-7B base_model:quantized:teknium/OpenHermes-2.5-Mistral-7B autotrain_compatible text-generation-inference endpoints_compatible 4-bit gptq region:us