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README.md

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+The **state-of-the-art NER and POS tagging models** on Tweebank are the following:
+1. [`TweebankNLP/bertweet-tb2_wnut17-ner`](https://huggingface.co/TweebankNLP/bertweet-tb2_wnut17-ner)
+2. [`TweebankNLP/bertweet-tb2_ewt-pos-tagging`](https://huggingface.co/TweebankNLP/bertweet-tb2_ewt-pos-tagging)
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+The other two models are the baselines models. Please refer to their README files for more details.