sentence-transformers safetensors bert sentence-similarity feature-extraction dataset_size:1K<n<10K loss:MultipleNegativesRankingLoss loss:CoSENTLoss en arxiv:1908.10084 arxiv:1705.00652 base_model:google-bert/bert-base-uncased base_model:finetune:google-bert/bert-base-uncased autotrain_compatible text-embeddings-inference endpoints_compatible region:us