transformers safetensors mistral text-generation storm openchat RLAIF reward model conversational en dataset:berkeley-nest/Nectar arxiv:2406.11817 arxiv:2310.03708 base_model:openchat/openchat-3.5-0106 base_model:finetune:openchat/openchat-3.5-0106 license:apache-2.0 autotrain_compatible text-generation-inference endpoints_compatible region:us