This reverts commit 6f6cc947.

* add recompute document

* add dataset

* add back dataset and data feeder

* Update save_load_variables.rst (#1520)

* update 1_6 release

* fix readme
test=document_preview

* add new tree index

* update 1_6 release

* fix readme
test=document_preview

* add new tree index

* test=document_preview

* test=document_preview

* dygraph translation

* cn doc bug fix

* translate dygraph according to 1.5.1 website + bug fix

* add flag files

* add flags file

* delete space

* recheck_structure&fix_typo

* fix_structure

* adjust_dist_structure

* fix_deadlink

* fix deadlink

* 1.3 => develop (4.12)

* Delete InMemoryDataSet and QueueDataSet 

refer to #784

* add pixel shuffle and in_dygraph_mode

* Change api guides directory

* fix wrong ref

* Update memory_optimize.rst

* 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

* 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

* delete en2zn link

* 1207

 1.english api reference links removed
2. formatted

* update transpiler

* update profilse_cn

* 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)