* clean code of s2anet

* fix for paddle==2.1.0

* remove debug info

* update comment

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

* add sparsercnn

* update sparsercnn

* Add DETR

* drop return_pad_mask in PadBatch

* fix bs=2 of FCOS

* fix bs=2 of ttfnet

* fix cascade deploy

* speedup by paddle.expand

* 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

* reorganize the code, and fix bug

* fix typo

* remve comment

* reorganize code

* Revert "reorganize code"

This reverts commit 4f928c3a46b264ba8815978b914bf81a46b66b62.

* set weight

* set default config

* fix code style

* add solov2 enhance model

* refine keypoint deploy

* fit video infer

* fix post process

* update comments for keypoint_batch_size

* modified freeze at in resnet

* freeze_at should less than num_stage

* support --eval for s2anet

* add spine dataset and config yml for s2anet

* add doc for s2anet

* update doc

* fix typo, test=document_fix

* add some comments, and update import

* add mot score to txt results

* fix mot install typo

* add epoch for deepsort

* fix paddle no_grad

* deploy infer save image txt

* add deepsort video infer modelzoo, test=document_fix

* fix deepsort doc results, test=document_fix

* add DarkPsoe support

* modify Top-Down bbox_file str to bbox.json

* jde fairmot export and video python infer

* add initializer functions

* rcnn bs>1

* delete redundant comments

* bs>1 for YOLO

* support no label training

* fix load_crowd

* update to fit rbox

* add empty_ratio

* update configs

* support mask rcnn

* clean drop_empty for mot & keypoint

* refine is_crowd

* add model_zoo unittest

* remove cython_bbox, test=document_fix

* add cython_bbox install log, test=document_fix

* fix jde negative coords

* update jde model zoo

* describe format for some txt, test=document_fix