* 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