Besides removing unnecessary imports, this also fixes the missing logger module in test_architectures.py within the static directory.

* add deepsort export model, reid infer

* fix jde_yolov3 metric

* fix deepsort deploy

* fix doc, clean code

* add mot deploy infer image, add run_benchmark

* jde fairmot export and video python infer

* add fairmot

* rename pretrain_weights

* add comments; reuse focal loss and convnorm

* update comments

* add deepsort configs comments

* fix doc, add readme_cn

* fix doc

* jde and deepsort: model