Update README.md

README.md

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 ## 📑 Model Description
 
-This is the domain-adapted PEGASUSScore for evaluating the quality of PET impressions. 
+This is the domain-adapted T5Score for evaluating the quality of PET impressions. 
 
 To check our domain-adapted text-generation-based evaluation metrics:
 - [BARTScore+PET](https://huggingface.co/xtie/BARTScore-PET)