Update README.md

README.md

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 license: apache-2.0
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-OFA-huge optimized image-captioning checkpoint
+OFA-huge checkpoint optimized for image-captioning 
 
-It is a form transformed from fairseq to huggingface and no other processing has been performed.
+It is transformed from fairseq to huggingface and no other processing has been performed.
 
-This checkpoint is not uploaded by the official OFA-sys, so i upload it.
+This checkpoint is not uploaded by the official OFA-sys, so i upload it for use.
 
 Thanks to OFA-sys(https://github.com/OFA-Sys/OFA)