sentence-transformers safetensors xlm-roberta sentence-similarity feature-extraction generated_from_trainer dataset_size:311737 loss:MSELoss arxiv:1908.10084 arxiv:2004.09813 base_model:FacebookAI/xlm-roberta-base base_model:finetune:FacebookAI/xlm-roberta-base model-index autotrain_compatible text-embeddings-inference endpoints_compatible region:us