Update README.md

README.md

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 license: apache-2.0
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-Based ob the paper: UmlsBERT: Augmenting Contextual Embeddings with a Clinical Metathesaurus 
+Based ob the paper: "UmlsBERT: Augmenting Contextual Embeddings with a Clinical Metathesaurus" (https://aclanthology.org/2021.naacl-main.139.pdf).
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 and the github repo: https://github.com/gmichalo/UmlsBERT
 
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 Changing base model to SpanBert instead of Bert.
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 Trained from scratch on MIMIC dataset, using the UMLS dataset to mask words within the text.
 
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 We achived better accuracy on MedNLI dataset.
 
 Bert Model accuracy: 83%
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 SpanBert Model accuracy: 86%