transformers gguf Mixtral instruct finetune chatml DPO RLHF gpt4 synthetic data distillation en dataset:teknium/OpenHermes-2.5 base_model:NousResearch/Nous-Hermes-2-Mixtral-8x7B-DPO base_model:quantized:NousResearch/Nous-Hermes-2-Mixtral-8x7B-DPO license:apache-2.0 endpoints_compatible region:us imatrix conversational