Update README.md

README.md

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 ## Model description
-This is a Japanese light weight BERT model pre-trained from scratch on Ecommerce User Review corpus from Rakuten & Amazon.
+This is a Japanese light weight BERT model pre-trained from scratch on Ecommerce japanese data. 
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+For pre-training, User short reviews and review titles are taken from Rakuten & Amazon websites.
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+This base model is primarily designed to fine-tune on short text classification use-cases.
 
 
 ## How to use