sentence-transformers safetensors roberta sentence-similarity feature-extraction loss:GISTEmbedLoss en arxiv:1908.10084 arxiv:2402.16829 base_model:distilbert/distilroberta-base base_model:finetune:distilbert/distilroberta-base model-index co2_eq_emissions autotrain_compatible text-embeddings-inference endpoints_compatible region:us