* keypoint petr (#7774)

* petr train ok

train ok

refix augsize

affine size fix

update msdeformable

fix flip/affine

fix clip

add resize area

add distortion

debug mode

fix pos_inds

update edge joints

update word mistake

* delete extra codes;adapt transformer modify;update code format

* reverse old transformer modify

* integrate datasets

* add config and architecture for human36m (#7802)

* add config and architecture for human36m

* modify TinyPose3DHRNet to support human3.6M dataset

* delete useless class

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Co-authored-by: XYZ <1290573099@qq.com>

* save infer results to file.

* update, for mac temp file

* update func name, fix mem, fix dir

This reverts commit 44875dab.

This reverts commit f26a86fe.

* update version and config download

* add solov2 dygraph model, test=dygraph

* clean useless log in DataLoader

* fix infer set_sample_list_generator

* fix all documentation

* fix docs conf.py

* fix some error

* fix readthedocs

add libra rcnn, including
  * libra loss
  * libra fpn(bfp)
  * libra sampling

* Add inference benchmark
* Adjustment order
* Update some descriptions

* Rename object_detection to PaddleDetection
* Small fix for doc