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* [Docs] add faq document * Update docs/en/faq.md Co-authored-by: Junjun2016 <hejunjun@sjtu.edu.cn> * Update docs/zh_cn/faq.md Co-authored-by: Junjun2016 <hejunjun@sjtu.edu.cn> * modify readme * modify index.rst Co-authored-by: Junjun2016 <hejunjun@sjtu.edu.cn>