[Install doc] add the pypi-source (#1172)
* revise the doc,test=doc_fix
* test=doc_fix
* test=doc_fix
* Update install_cn.md
Co-authored-by: TianYuan <white-sky@qq.com>
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* revise the doc,test=doc_fix
* test=doc_fix
* test=doc_fix
* Update install_cn.md
Co-authored-by: TianYuan <white-sky@qq.com>