transformers safetensors roberta token-classification ner named-entity-recognition en dataset:DFKI-SLT/few-nerd arxiv:2402.15343 base_model:numind/NuNER-v2.0 base_model:finetune:numind/NuNER-v2.0 license:cc-by-sa-4.0 model-index autotrain_compatible endpoints_compatible region:us