peft safetensors llama alignment-handbook trl orpo generated_from_trainer dataset:HuggingFaceH4/ultrafeedback_binarized base_model:meta-llama/Meta-Llama-3-70B-Instruct base_model:adapter:meta-llama/Meta-Llama-3-70B-Instruct license:llama3 4-bit bitsandbytes region:us