* add inference benchmark

* add mot data

* fix operators, source

* fix data source transform

* fix parse_dataset register_op

* fix scale_factor, RandomAffine

* add assert for check

* fix ci

* add lite demo

* update 2.0.1

* update doc on develop, test=document_fix

* update dependency of ppdet and paddle, test=document_fix

* update docs, test=document_fix

* remove rbox-iou-ops dependence

* update install doc

* fix some docs error

* move ssld model, test=document_fix

* fix typo, test=document_fix

* add 2.0 CHANGLOG

* update README

* update doc, test=document_fix

* add citation

* update citation and ppyolo doc

* Add S2ANet model for Oriented Object Detection.

* add docs for custom dataset, reader and model technical

* modify docs according to review, test=document_fix

* modify READER.md, test=document_fix

* add config annotation doc, test=document_fix

* update doc of config

* mlp_dim-->out_channel of TwoFCHead

* update doc, test=document_fix

* update doc, test=document_fix

* update quick_start

* update get_started

* update doc, test=document_fix

* Update install doc and deploy doc.

* fix dide link, test=document

* fix dide link, test=document

* support mask_rcnn for kunlun

* Rename dir name in modeling

* Update changelog

* support ppyolo for kunlun

* Update QUICK_STARTED_cn.md (#1757)

fix typo

* cherry-pick #1757 and #1473, test=document_fix

* update v0.5 release note

* update some comments

* Add PrepareData-->SelectModel-->Train-->Eval-->Test-->Infer-->Slim-->Deploy document DetectionPipeline.md, test=document_fix

* update solov2 some detail

* fix check paddle version

* enhance voc to coco docs

* fix voc annotation float type

* unify log_smooth_windows and log_iter

test=develop

* remove duplicate log_iter

* remain mobile yml, since they are soft-link

test=develop