* [ppyolov3] add ppyolov3 base code

* add ppyolov3 s/m/x

* modify ema

* modify code to convert onnx successfully

* support arbitrary shape

* update config to use amp default

* refine ppyolo_head code

* modify reparameter code

* refine act layer

* adapter pico_head and tood_head code

* remove ppyolov3 yaml

* fix codestyle
Co-authored-by: Nwangxinxin08 <wangxinxin08@baidu.com>

* add a new version code of PicoDet

This reverts commit 3e0e3585.

* support export post_process in PicoDet

* support different norm_type for different module when convert to sync batch norm

* remove BatchNorm in esnet

* refine sync bn

* fix bugs of batch_norm

* fix bugs while deploying and modify BatchNorm to BatchNorm2D

* param_attr -> weight_attr in BatchNorm2D

* modify BatchNorm to BatchNorm2D

* add multi-scale test

* add resnet34-fpn-mstest item in model zoo

* unstructured prune for picodet

* add mtmct aic_vehicle baseline

* fix clip_bbox, add coco model filter, fix some bugs

* fix infer bugs, fix crops and mtmct vis

* fix engine tracker infer

* fix mtmct images deploy

* fix readme and cfg

* remove mtmct of cfg modeling and tracker

* fix doc cfg

* add mcfairmot train eval export code

* fix eval and export

* update modelzoo

* add hrnet18_dlafpn

* unify jdetracker

* fix deploy infer for single class

* fix multi class fairmot deploy

* fix mcmot data source and deploy

* fix num_identities

* fix num_identities_dict

* fit some detectors for deepsort

* fix configs and readme

* add tracked bbox score cls_id, fix deploy bugs

* add deepsort cfg score threshold

* fix deploy deepsorttracker, fix cfgs

* merge develop, fix format

* add pplcnet

* add pplcnet cfgs

* fix cfgs

* fix cfgs

* clean pplcnet code

* fix readme

* update mot vehicle modelzoo

* update bdd100k visdrone vehicle  modelzoo

* 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

* update PicoDet Architecture and config

* update picodet inference deploy

* add general yolov3 for deepsort

* refine format

* fix no target infer

* fix readme and conflict

* [dev] add TOOD

* fix link and notes

* replace ConvNormLayer

* add keypoint top-down cpp infer; total:5ms,pre:0.7ms,infer:3.8ms,post:0.01ms

* add dark_pose support

Revert "add keypoint top-down cpp infer; total:5ms,pre:0.7ms,infer:3.8ms,post:0.01ms (#4058)" (#4216)

This reverts commit 08619b4e.

* Update PicoDet adn GFl