sentence-transformers safetensors bert sentence-similarity feature-extraction dataset_size:100K<n<1M loss:MSELoss en arxiv:1908.10084 arxiv:2004.09813 base_model:w601sxs/b1ade-embed base_model:finetune:w601sxs/b1ade-embed model-index autotrain_compatible text-embeddings-inference endpoints_compatible region:us