transformers safetensors gpt2 text-generation alignment-handbook trl dpo generated_from_trainer conversational dataset:HuggingFaceH4/ultrafeedback_binarized base_model:yangzhao02/gpt2-large-sft base_model:finetune:yangzhao02/gpt2-large-sft autotrain_compatible text-generation-inference endpoints_compatible region:us