sentence-transformers safetensors mpnet sentence-similarity feature-extraction generated_from_trainer dataset_size:5749 loss:CosineSimilarityLoss arxiv:1908.10084 base_model:sentence-transformers/all-mpnet-base-v2 base_model:finetune:sentence-transformers/all-mpnet-base-v2 model-index co2_eq_emissions autotrain_compatible endpoints_compatible region:us