* update paddle version in DyGraph.md, test=develop

* update paddle version in DyGraph.md, test=develop

* Update save_load_variables.rst (#1520)

* update 1_6 release (#1522)

* New tree (#1525)

* update 1_6 release

* fix readme
test=document_preview

* add new tree index

* Add save load save_dygraph load_dygraph (#1519)

* add save load save_dygraph load_dygraph, test=develop

* add .idea in gitignore, test=develop

* minor fix, test=develop

* doc refines, test=develop

* doc refines, test=develop

* Update custom_op.md (#1528)

* refine_design_idea_doc, test=develop (#1533)

* Add basic concepts (#1530)

* add cn docs, test=develop

* refine docs, test=develop

* add program doc, test=develop

* fix links, test=develop

* fix links, test=develop

* fix links, test=develop

* fix links, test=develop

* Fluid -> Paddle, test=develop

* Fluid -> Paddle, test=develop

* minor fix, test=develop

* minor fix, test=develop

* add Categorical and MultivariateNormalDiag doc (#1517)

* fix typos and links, test=develop, test=document_preview (#1514)

* Update programming_guide.md, test=document_fix (#1534)

重新组织了"新手入门>编程指南"中文文档，去掉了部分基础概念的详细介绍，比如Tensor，program等，本文档中更加注重对paddle静态图使用方式的说明

* Add C-API inference document and provide demo in the doc (#1526)

* add C-API inference document and provide demo in the doc

* fix Layer、label_smooth and Pool2D api, test=develop (#1506)

* fix Layer and Pool2D api, test=develop

* update label_smooth_cn.rst, test=develop

* modified cn doc for attr(shape) supporting -1, test=develop (#1531)

* Add gather_tree_cn.rst (#1537)

* Polish cn doc fo gru_unit, lstm_unit and scaled_dot_product_attention.

* Add gather_tree_cn.rst and update the data type of assign/fill_constant_batch_size_like/gather_nd.

* Fix _cn_api_fluid_layers_gather_tree

* Update tensor_array_to_tensor and add mse_loss.

* Update index_cn.rst

* Add GetExpectedKernelType method override rule to op_notes (#1527)

* add GetExpectedKernelType func override tule to op_notes

* add examples url

* add exemples to whether override method

* polish description

* polish doc based review comments

* Update deploy_ctr_on_baidu_cloud_cn.rst  (#1518)

* Add picture for deploy_ctr_on_baidu_cloud_cn.rst

* Baidu yun K8S + Volcano CTR Training Document 1.0

* Add ctr_pserver_log.png for deploy_ctr_on_baidu_cloud_cn.rst

* Update deploy_ctr_on_baidu_cloud_cn.rst

* Update deploy_ctr_on_baidu_cloud_cn.rst

* Add pserver-log

* Update deploy_ctr_on_baidu_cloud_cn.rst

* chanage image of kubectl download version from 1.13.3 to  1.13.4

* Update deploy_ctr_on_baidu_cloud_cn.rst

* Update deploy_ctr_on_baidu_cloud_cn.rst

Update on Sept 18. 
remove description of helm, tiller, Go install.
replace new yaml provided by Jinghui Zhang

* add some images

* Update deploy_ctr_on_baidu_cloud_cn.rst

add model output manipulation part

* Update deploy_ctr_on_baidu_cloud_cn.rst

* update deploy ctr on baidu cloud cn.rst

* auto convert from md

* Update deploy_ctr_on_baidu_cloud_cn.rst

* replace the overview.png

* Update deploy_ctr_on_baidu_cloud_cn.rst

* Update deploy_ctr_on_baidu_cloud_cn.rst

* Delete train_on_baidu_cloud_en.rst

it is outdated and cannot match with Chinese Version for months.

* Delete train_on_baidu_cloud_cn.rst

Has been replaced by ELASTIC CTR

* Update deploy_ctr_on_baidu_cloud_cn.rst

* Update deploy_ctr_on_baidu_cloud_cn.rst

* Update deploy_ctr_on_baidu_cloud_cn.rst

* Update deploy_ctr_on_baidu_cloud_cn.rst

* [Paddle-Lite] add Paddle-Lite doc test=document_preview (#1545)

* change the version number of windows inference (#1549)

* Delete duplicate file api_tree

* fix inference api (#1546)

test=develop

* 1026 develop (#1551)

* add dataset

* add back dataset and data feeder

test=document_fix

* add stop_gradient notes in Dygraph, test=develop

* add stop_gradient notes in Dygraph, test=develop

* polish code in Dygraph, test=develop

* polish code in Dygraph, test=develop

* polish code in Dygraph, test=develop

* add Automatic pruning in Dygraph, test=develop

* fix Dygraph cn sample code, test=develop

* fix Dygraph doc format, test=develop

new document to upload in this PR

the previous doc talks about how to run CTR training on Baidu Cloud K8S Cluster.

the new doc are modified in following points.

1.Run CTR Training on Baidu Cloud K8S + Huawei Volcano
2.Auto Split CTR model into sparse ones and dense ones.
3.Cube auto fetch Sparse model, Serving auto fetch dense model.
4.provide paddle serving client to test the ctr prediction.

* polish en doc of data_loader

* follow comments

* use fluid.data()

* refine prepare steps doc, test=develop

* replace layers.data with fluid.data, test=develop

* refine doc

* follow lanxiang's comments, test=develop

* add data-parallel model doc

* Polish DyGraph doc

Unify the guide content structure.

* fix typo in doc

* add faq for lod_tensor

* format the lod_tensor.rst

修改了DyGraph.md文件中加载图片的错误路径，使其与PaddleBook保持统一

* 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

* Update cluster_quick_start.rst

test=document_preview

test=document_preview

test=document_preview

test=document_preview

remove command argument train.py from the document, which is added by mistake.

* Update fleet_api_howto_cn.rst

* Update fleet_api_howto_cn.rst

* Update fleet_api_howto_cn.rst

* fleet api

* fleet api

* fleet api

* improve the doc of metrics introduction

* tweak the doc of metrics introduction

* 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.

* 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

* update dygraph user guide to fit new api

* refine doc

* remove pylayer support doc

* refine words

* refine sample code