transformers safetensors mistral text-generation reward model RLHF RLAIF conversational en dataset:berkeley-nest/Nectar arxiv:2306.02231 base_model:berkeley-nest/Starling-LM-7B-alpha base_model:quantized:berkeley-nest/Starling-LM-7B-alpha license:cc-by-nc-4.0 autotrain_compatible text-generation-inference 4-bit awq region:us