transformers gpt_neox text-generation alignment-handbook trl sft generated_from_trainer conversational dataset:HuggingFaceH4/ultrachat_200k base_model:EleutherAI/pythia-410m-deduped-v0 base_model:finetune:EleutherAI/pythia-410m-deduped-v0 license:apache-2.0 autotrain_compatible endpoints_compatible region:us