Update README.md

README.md

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 # {pritamdeka/S-Biomed-Roberta-snli-multinli-stsb}
 
-This is a [sentence-transformers](https://www.SBERT.net) model: It maps sentences & paragraphs to a 768 dimensional dense vector space and can be used for tasks like clustering or semantic search.
+This is a [sentence-transformers](https://www.SBERT.net) model: It maps sentences & paragraphs to a 768 dimensional dense vector space and can be used for tasks like clustering or semantic search. The base model used is [allenai/biomed_roberta_base](https://huggingface.co/allenai/biomed_roberta_base) which has been fine-tuned for sentence similarity.
 
 <!--- Describe your model here -->