sentence-transformers safetensors mpnet sentence-similarity feature-extraction generated_from_trainer dataset_size:100231 loss:MultipleNegativesSymmetricRankingLoss en dataset:sentence-transformers/natural-questions arxiv:1908.10084 base_model:microsoft/mpnet-base base_model:finetune:microsoft/mpnet-base license:apache-2.0 model-index co2_eq_emissions autotrain_compatible endpoints_compatible region:us