Update README.md

README.md

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 ## 📚 Dataset  
-Training data are publicly available on [Hugging Face Datasets](https://huggingface.co/datasets/DMIR01/DMRetriever_MTT).
+Training data are publicly available on [DMRetriever_MTT](https://huggingface.co/datasets/DMIR01/DMRetriever_MTT).
 
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