* update_to_1.2.1

* update_to_1.2.1

* polish_win_install (#562)

* polish_win_install

* follow_comments

* update_to_1.2.1

[cherry-pick]0114-cnapi-bugfix

* update_inference_link

* delete cuda 7.5 line in table

* add&update develop table

* integration_2tables

cherry pick - cn api fix bugs (#523)

* cn api fix bugs

* Update fluid_cn.rst

* Update lod_tensor.rst

- Modify some inaccurate descriptions
- Add the complete code example

* Update lod_tensor.rst

update_submodule_1.2

remove unused inference header

[cherry-pick] Update cn_api from develop to release/1.2

[cherry-pick] fix last_step for 1.2

* fix the ref for api_guides

* update_book

* fix for python3 support (#488)

* fix for python3 support
test=develop

* test=develop

* backward.rst

* Update backward.rst

* Update programming_guide.md (#493)

* update layers_nn

* Update layers_cn.rst

* Update layers_cn.rst

* update api_cn except layers

* update fluid_cn.rst

* Update metrics_cn.rst

* update_ciwhl

* update_2nd

* fix_3rd

* fix_deadlinks (#476)

* [infer][rl_note]develop=1.2 (#480)

* update_infer_toctree

* add_fluid

* Update release_note.rst

* update_install_doc

* update layers_cn_by_wh

* Fix some typo 1211 (#483)

* fix some typo

* Update nets_cn.rst

* update_version

* refine info of whl (#485)

* refine info of whl

* fix link for release-whls

* remove fast install info (#486)

* refine info of whl

* fix link for release-whls

* remove fast install info

* update layers_nn

* Update layers_cn.rst

* Update layers_cn.rst

* update api_cn except layers

* update fluid_cn.rst

* Update metrics_cn.rst

* update_ciwhl

* update_2nd

* fix_3rd

* fix_deadlinks (#476)

* [infer][rl_note]develop=1.2 (#480)

* update_infer_toctree

* add_fluid

* Update release_note.rst

Rl headline

update_infer_toctree

fix_infer_headline

fix_infer_headline

* add_api_cn (#437)

* add gpu benchmark page (#436)

* add gpu benchmark

* fix comments

* add chinese link in gen_doc.py (#439)

* modified gen_doc.py

* Update gen_doc.py

* update gen_doc.py

* Update mobile doc (#440)

* update_en_structure

* update_Paddle_commitid

* delete_DS

* update_mobile_doc

* Update book commit (#438)

* update_en_structure

* update_Paddle_commitid

* delete_DS

* update_book_commit_id

* update_api_rst

* Adjust structure of advanced usage (#442)

* adjust_structure_of_advanced_usage

* Update paddle_gpu_benchmark.md

* adjust_toctree_hidden

* fix_api_guide

* Update index.rst

* fix deadlinkes (#443)

* add_toctree (#445)

* adjust_beginners_structure (#446)

* adjust_beginners_structure

* Update index.rst

* update install_doc for python3 (#418)

* update install_doc for python3

* update python3.5+ info,test=develop

* fix review, test=develop

* fix_pic (#447)

* delete en2zn link

* update lod_tensor

* 1207

 1.english api reference links removed
2. formatted

* update transpiler

* update profilse_cn

* Update docker-image instroduce, test=develop (#459)

* fix_bug (#460)

* [cp2dev]Add avx info 1.1 (#279) (#451)

* Add avx info 1.1 (#279)

* refine avx info representation

* refine avx info representation

* refine avx info representation

* updatetoavx

* fix_AVX

* update_en_api (#461)

* update api guides for cn (#462)

* Update commit_id of Paddle (#463)

* update_en_api

* update_again

* Fix bug (#465)

* update_en_api

* update_again

* bug_fix

* fix_2nd

* add_release_note