sentence-transformers safetensors roberta sentence-similarity feature-extraction dataset_size:100K<n<1M loss:MatryoshkaLoss loss:MultipleNegativesRankingLoss loss:CosineSimilarityLoss arxiv:1908.10084 arxiv:2205.13147 arxiv:1705.00652 base_model:klue/roberta-small base_model:finetune:klue/roberta-small model-index autotrain_compatible text-embeddings-inference endpoints_compatible region:us