* add flow_statistic for mot_jde

* raise NotImplementedError when multi-class entrance counting is chosen

* revert * 'mp4v' to *'mp4v'

* add python flow_statistic for sde

* update window timer for pptracking

* keep origin mp4v format

* add flow_statistic for mot_jde

* raise NotImplementedError when multi-class entrance counting is chosen

* revert * 'mp4v' to *'mp4v'

* add implementment for FlowStatics

* rename count to entrance_count; rename count_set to id_set

* add a todo for entrance line setting

* rename count to do_entrance_counting

* convert print_save_file to the origin line

* add python deploy for pptracking

* fix plot tracking classes

* fix picodet deepsort

* fix format

* rename to det_infer

* add stream input

* add stream input & add save_result

* update citation

* update citation

* 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

* update openvino_infer_problem

* remove hardnet85 cfgs, fix readme of mot vehicle pedestrian

* remove hardnet cfg, test=document_fix

* 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

* fix PicoDet docs