* fix the doc for 1.5 test=develop

* test=develop

* Update fleet_api_howto_cn.rst

* Update fleet_api_howto_cn.rst

* Update fleet_api_howto_cn.rst

* test=develop, update install doc

* add setuptools dependency

* Update compile_Ubuntu.md

update cudnn version

* Update install_Ubuntu.md

update cudnn version

* Update install_CentOS.md

update cudnn version

* test=develop, refine ubuntu cuda support

* test=develop, refine ubuntu cuda support

* test=develop, refine python support on python3.5

* fix python2 in ubuntu16.04 need gcc 5.4

* add nccl related doc

* refine doc

* add gpu fast install doc

* refine command of pip

* add avx off for mac complie

* refine code

* refine doc

* fix python only support 64bit

* fix doc problem

* refine doc

* remove centos7 support cuda8 compile

* fix centos6 compile not support

* Add best practice

Create a special case for dygraph-node when running gen_doc.

* bugfix (#967)

* bugfix

* Update release_note_cn.rst

* bug fix (#968)

* break up layers and change index of layers

* prettify script

* update api_cn; fix the error of reverting layers_cn to 1.4; include previous changes

* update layers_cn; add code example to elementwise_mod

* delete recordio_writer_cn; revert index_cn

* update api_cn after review

* fix io_cn.rst

* update layers_cn

* update io_cn

* add lite

* lite clean

* update

* up

* update

* refine lite mobile doc (#962)

* update

* update

* test=develop, update install doc

* add setuptools dependency

* Update compile_Ubuntu.md

update cudnn version

* Update install_Ubuntu.md

update cudnn version

* Update install_CentOS.md

update cudnn version

* test=develop, refine ubuntu cuda support

* test=develop, refine ubuntu cuda support

* test=develop, refine python support on python3.5

* fix python2 in ubuntu16.04 need gcc 5.4

* add nccl related doc

* refine doc

* add gpu fast install doc

* refine command of pip

* add avx off for mac complie

* refine code

* refine doc

* fix python only support 64bit

* update urls for x2paddle

* Update TensorFlow-Fluid.rst

* Update TensorFlow-Fluid.rst

* Update TensorFlow-Fluid.rst

* Update TensorFlow-Fluid.rst

* Update TensorFlow-Fluid.rst

* Update TensorFlow-Fluid.rst

* update paddle-mobile doc

* delete untracked file

* add install appendix

* add install appendix

* add install appendix

* add install appendix

* update mobile according to paddle-mobile repo

* Update mobile_readme_en.md

1.add dygraph api doc
2.add dygraph node

* update paddle-mobile doc

* delete untracked file

* documents will be ready afterwards

not ready now

* Update index_en.rst

* Update index_cn.rst

* Update index_en.rst

* Update index_cn.rst

* Update index_en.rst

* fleet api

* fleet api

* fleet api

* refine inference api

test=develop

* fix typo

* fix typo

* fix comments

* fix typo

* update faq by sheqi

* fix format errors

* renew links; fix format issues

* improve the doc of metrics introduction

* tweak the doc of metrics introduction

* test=develop, update install doc

* add setuptools dependency

* Update compile_Ubuntu.md

update cudnn version

* Update install_Ubuntu.md

update cudnn version

* Update install_CentOS.md

update cudnn version

* test=develop, refine ubuntu cuda support

* test=develop, refine ubuntu cuda support

* test=develop, refine python support on python3.5

* fix python2 in ubuntu16.04 need gcc 5.4

* add nccl related doc

* refine doc

* add gpu fast install doc

* refine command of pip

* add avx off for mac complie

* refine code

* refine doc

* update memory_optimize.rst, test=develop

* follow comment, fix typo, test=develop

* Create quick_start.rst

* Update quick_start.rst

* test=develop, update install doc

* add setuptools dependency

* Update compile_Ubuntu.md

update cudnn version

* Update install_Ubuntu.md

update cudnn version

* Update install_CentOS.md

update cudnn version

* test=develop, refine ubuntu cuda support

* test=develop, refine ubuntu cuda support

* test=develop, refine python support on python3.5

* fix python2 in ubuntu16.04 need gcc 5.4

* add nccl related doc

* refine doc

* add gpu fast install doc

* refine command of pip

* add avx off for mac complie

* Modify errors in VisualDL usage manual
Including:
	line break errors;
	punctuation errors;
	Add explanation for each pictures.

* Modify errors in VisualDL usage manual
Both Chinese and English Documents are modified.
Including :
	line break errors.
	spell errors

* Modify the line break error in visualdl_usage_en
The Line break errors in visualdl_usage_en will make the demo program crash into errors.
I have fixed these errors.

* Modify the line break error in visualdl_usage_en.md
The errors have been fixed.