peft tensorboard safetensors llama alignment-handbook trl sft generated_from_trainer dataset:HuggingFaceH4/ultrachat_200k base_model:TinyLlama/TinyLlama-1.1B-intermediate-step-1431k-3T base_model:adapter:TinyLlama/TinyLlama-1.1B-intermediate-step-1431k-3T license:apache-2.0 4-bit bitsandbytes region:us