transformers gemma text-generation chat dpo fine-tuning function-calling instruct rlhf sft tool-calling dataset:danilopeixoto/pandora-instruct dataset:danilopeixoto/pandora-tool-calling dataset:danilopeixoto/pandora-rlhf arxiv:2306.05685 base_model:google/gemma-7b base_model:finetune:google/gemma-7b license:bsd-3-clause autotrain_compatible endpoints_compatible region:us