* add param_attr example

* move example

* refine code emxpale

* improve embeding cn doc test=document_preview

* refine text format test=document_preview

* refine return type test=document_preview

* add data example test=document_preview

* refine warining and return type

* refine param_attr

* modify warning

* add warning

* modify x into input

* refine return doc

* add padding data update doc

* add np.dtype

* fixed one error of api_cn

* fixed some errors of api_cn

* fixed some errors of api_cn

* fixed two errors.

* fixed two errors

* fixed one error.

* fixed one error

* fixed one error.

* fixed two errors.

* fixed one error.

* fixed two errors

* fixed two links

* synchronize api_cn with the api_en of develop.

* updated develop/api_cn

* update the api_cn of develop

* update api_cn of develop

* fixed some errors

* Delete .DS_Store

* Delete .DS_Store

* Delete .DS_Store

* Delete .DS_Store

* Delete .DS_Store

* fixed some wrong links

* fixed two links

* fixed two links and some error.

* fixed some errors.

* fixed two links