transformers safetensors mistral text-generation instruct finetune chatml gpt4 synthetic data distillation dpo rlhf laser conversational en dataset:mlabonne/chatml_dpo_pairs arxiv:2312.13558 base_model:teknium/OpenHermes-2.5-Mistral-7B base_model:finetune:teknium/OpenHermes-2.5-Mistral-7B license:apache-2.0 model-index autotrain_compatible text-generation-inference endpoints_compatible region:us