gguf alignment-handbook trl sft generated_from_trainer TensorBlock GGUF dataset:HuggingFaceH4/ultrachat_200k base_model:nnheui/stablelm-2-1_6b-sft-full base_model:quantized:nnheui/stablelm-2-1_6b-sft-full license:other endpoints_compatible region:us conversational