change threshold for ptq hpo (PaddlePaddle#1254)

fix ptq demo (PaddlePaddle#1067)

Change version to v2.2.2

Change version to 2.2.1

Change version to 2.2.0

Change version to 2.2.0-rc0

fix illegal usage: paddle.static.CPUPlace() (PaddlePaddle#852) (Paddl…

…ePaddle#853)

Add CE test for dygraph qat (PaddlePaddle#748) (PaddlePaddle#749)

Add CE test for dygraph qat (PaddlePaddle#748) (PaddlePaddle#749)

Support dygraph and OFA