transformers safetensors qwen2 text-generation alignment-handbook ndcg generated_from_trainer conversational dataset:yangzhao02/ListUltraFeedback base_model:yangzhao02/qwen2-0.5b-sft base_model:finetune:yangzhao02/qwen2-0.5b-sft autotrain_compatible text-generation-inference endpoints_compatible region:us