Created by: tink2123

• update cn_api

• add one change

• add example

• update layers_cn

• Update layers_cn.rst

• update layers

• Update layers_cn.rst

• Update layers_cn.rst

• Update layers cn 1218 (#3)

• update api_cn 1218

• Update metrics_cn.rst

• Update optimizer_cn.rst

• Update profiler_cn.rst