* cherry-pick cfg modelzoo readme

* cherry pick modeling engine source

* cherry-pick deploy python mot

* remove hardnet85 cfgs, fix readme of mot vehicle pedestrian

* remove hardnet cfg, test=document_fix

* add 576 864 configs

* update 864 576 modelzoo

* add sge attention on fpn

* add iou head

* add config, fix head

* fix iou offset weight

* fix fairmot centerhead

* add centernet

* add centernet

* add r50 for centernet

* support deploy for centernet

* add doc

* update pretrain

* clean code

* update r50 doc

* unify for_mot

* update code according to review

* update doc

* refine preprocess

* update doc

* add fairmot deploy

* separate main_jde

* update copyright & add PrintBenchmark

* refine lap

* add hardnet85 fairmot

* fix hardnet85

* add centernet hardnet fpn, fix config

* update modelzoo

* update modelzoo readme

* remove comments

* add hardnet num_layers assert

* fix hardnet85 config

* add pedestrian vehicle cfgs

* fix metric category

* fix mot metric

* fix mot metric

* update pedestrian and vehicle modelzoo

* update headtracking modelzoo

* add tools for data processing

* add data pre-process code

* fix tools code format

* add hrnet18 fairmot

* add lite hrnet_w18

* add hrnet dlafpn

* update hrnet18_dlafpn modelzoo

* hrnet18dlafpn modelzoo

* add comments

* set neck not none, update modelzoo

* add small scale config

* add model zoo

* remove metric type

* add kitti metric

* clean kitti metric code

* fix kitticars doc

* remove kitti headtracking cfgs

* remove kitti headtracking cfgs, clean code

* fix datatype and ffmpeg, test=document_fix

* add soft link, test=document_fix

* add doc link, test=document_fix

* fix deploy image_list, test=document_fix

* fix train diff for fairmot

* set use_shared_memory to True for fairmot training

* add the config of fairmot_headtracking

* mot video decode to images

* add infer_dir for mot

* fix export and unite pose infer

* remove task in mot source

* set image_dir

* update doc

* merge upstream

* clean code

* add batch_size in keypoint_detector

* add mot keypoint unite python infer

* fix mot pose fps

* update mot doc config, test=document_fix

* update citations, test=document_fix

* update title, test=document_fix

* add mot16test doc, test=document_fix

* add mot16test doc, test=document_fix

* fix mot doc, test=document_fix

* fix mot16 doc, test=document_fix

* fix ffmpeg video infer, fix doc, test=document_fix

* fix ffmpeg installl, test=document_fix

* fix mot doc

* remove image_lists, fix all mot docs, add custom data

* fix doc, test=document_fix

* fix dov

* fix doc format, test=document_fix

* add fairmot

* rename pretrain_weights

* add comments; reuse focal loss and convnorm

* update comments