sentence-transformers pytorch bert sentence-similarity feature-extraction generated_from_trainer dataset_size:96724 loss:TripletLoss loss:MultipleNegativesRankingLoss loss:CoSENTLoss arxiv:1908.10084 arxiv:1703.07737 arxiv:1705.00652 base_model:NbAiLab/nb-sbert-base base_model:finetune:NbAiLab/nb-sbert-base model-index autotrain_compatible text-embeddings-inference endpoints_compatible region:us