sentence-transformers pytorch bert sentence-similarity feature-extraction generated_from_trainer dataset_size:700000 loss:DenoisingAutoEncoderLoss arxiv:1908.10084 arxiv:2104.06979 base_model:intfloat/e5-base-unsupervised base_model:finetune:intfloat/e5-base-unsupervised model-index autotrain_compatible text-embeddings-inference endpoints_compatible region:us