Update README.md

README.md

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 # pierluigic/xl-lexeme
 
-This is a [sentence-transformers](https://www.SBERT.net) model: It maps sentences & paragraphs to a 1024 dimensional dense vector space and can be used for tasks like clustering or semantic search.
+This is model is based on [sentence-transformers](https://www.SBERT.net): It maps target word in sentences to a 1024 dimensional dense vector space and can be used for tasks like clustering or semantic search.
 
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