sentence-transformers pytorch roberta sentence-similarity feature-extraction generated_from_trainer dataset_size:300000 loss:DenoisingAutoEncoderLoss arxiv:1908.10084 arxiv:2104.06979 base_model:FacebookAI/roberta-base base_model:finetune:FacebookAI/roberta-base model-index autotrain_compatible text-embeddings-inference endpoints_compatible region:us