transformers safetensors pegasus_x text2text-generation generated_from_trainer synthsumm summarization en dataset:pszemraj/synthsumm base_model:pszemraj/pegasus-x-large-book-summary base_model:finetune:pszemraj/pegasus-x-large-book-summary doi:10.57967/hf/1400 license:bsd-3-clause autotrain_compatible endpoints_compatible region:us