transformers safetensors gemma text-generation alignment-handbook trl dpo generated_from_trainer conversational dataset:argilla/dpo-mix-7k base_model:Columbia-NLP/gemma-2b-zephyr-sft base_model:finetune:Columbia-NLP/gemma-2b-zephyr-sft license:other model-index autotrain_compatible text-generation-inference endpoints_compatible region:us