* delete old dygraph op test

* [dy2static] bugfix: make stop_gradient a cache key
1. make stop_gradient cache key in dy2static.

* fix ci errors

* fix ci error

* fix ci error

* fix ci error

* support prim test in OpTest

* fix cmake

* fix op test

* fix test_input_spec

* disable cinn in reduce_sum unit test

* add bfloat16 dtype for sum

* polish code

* add clear jit program function

* convert grad out from tensor to numpy

* remove unnecessary code

* add only_prim flag

* fix flag

* fix op test

* fix optest comp inplace error

* fix op test

* fix op test with guard

* add initialization of check_comp flag

* fix comp inplace error in op test

* rename check_comp with check_prim and add bfloat16 dtype convert

* rename comp_op_type to prim_op_type

* rename comp to prim

* remove useless code

* skip ci check for only prim

* add no_grad_vars and grad_outputs in prim test

* fix var_dict

* fix op test for only_prim

* fix dy2static bugs

* polish some code

* fix api docs format problems 121-131

* fix English docs #49042

* resolve conflict; test=document_fix
Co-authored-by: Ligoml <limengliu@tiaozhan.com>

* isort all files

* revert conflicting files

* revert conflicting files

* revert conflicting files

* [CodeStyle][py2][U004] unecessary explicit `object` inheritance in class definition

* fix an increment

* Remove reduntant numpy input in Example code

* Remove reduntant numpy input in Example code, test=document_fix

* update config

* re-blacken python code

* temporarily disable date and diff_py_file

* skip a format

* use yapf to format all python file

* yapf exclude two unittests file for they rely on writing and reading file, and format will break them

* disable diff_py_file because too many diff files cause command following failed

* gradients; test=document_fix

* fix VarType; test=document_fix

* fix vartype; test=document_fix

* cumsum; test=document_fix

* t; test=document_fix

* for test_mnist.py

* remove comments

* using type() replace isinstance()

* valid vars for run program OP in io.py

* open test_mnist in eager_gurad for coverage

add __all__=[] to python files not in API public list; import * only support in API public list files (#32643)

* add static check on data()

* follow comments

* fix ut

* add InputSpec

* add unittest for tensorSpec and SimpleNet

* add static data

* Rename `Input` into `InputSpec`

* fix argument place of Input api