sentence-transformers safetensors bert sentence-similarity feature-extraction dataset_size:10K<n<100K loss:BatchAllTripletLoss arxiv:1908.10084 arxiv:1703.07737 base_model:BAAI/bge-base-en-v1.5 base_model:finetune:BAAI/bge-base-en-v1.5 autotrain_compatible text-embeddings-inference endpoints_compatible region:us