transformers safetensors mixtral text-generation pruna-ai conversational base_model:zhengr/MixTAO-7Bx2-MoE-v8.1 base_model:quantized:zhengr/MixTAO-7Bx2-MoE-v8.1 autotrain_compatible text-generation-inference endpoints_compatible 4-bit bitsandbytes region:us