Update README.md

README.md

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-# Dataset for Multi domain
+# Dataset for Multi Domain （Including Kitchen, Books, DVDs, and Electronics）
 
-https://www.cs.jhu.edu/~mdredze/datasets/sentiment/index2.html
+[Multi-Domain Sentiment Dataset](https://www.cs.jhu.edu/~mdredze/datasets/sentiment/index2.html) by John Blitzer, Mark Dredze, Fernando Pereira.
 
+### Description：
 The Multi-Domain Sentiment Dataset contains product reviews taken from Amazon.com from 4 product types (domains): Kitchen, Books, DVDs, and Electronics. Each domain has several thousand reviews, but the exact number varies by domain. Reviews contain star ratings (1 to 5 stars) that can be converted into binary labels if needed. This page contains some descriptions about the data. If you have questions, please email me directly (email found here).
 
-Link to download the data:
+### Link to download the data:
 
 Multi-Domain Sentiment Dataset (30 MB) [domain_sentiment_data.tar.gz](https://www.cs.jhu.edu/~mdredze/datasets/sentiment/domain_sentiment_data.tar.gz)
 
 Books unlabeled data (2 MB) [book.unlabeled.gz](https://www.cs.jhu.edu/~mdredze/datasets/sentiment/book.unlabeled.gz)
 
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