* move mkldnn unittests to test dir

* add py_test_modules funcs

* move py_test_modules to test/mkldnn

* fix import error

* Revert "move py_test_modules to test/mkldnn"

This reverts commit 0277e0c29c22e5c29b7a3b843103f3d0b711c442.

* fix import error by conflicts

* fix errors

* fix mistake on solving conflicts

* delete old dygraph mkldnn op test

* add isort config

* isort all files

* update config

* re-blacken python code

* temporarily disable date and diff_py_file

* skip a format

* [CodeStyle] remove all future import

* revert test_error.py

* restore future import in example code

* Replace np.bool/np.bool8 with np.bool_

* Replace np.object with np.object_

* Replace np.complex with np.complex128

* Replace np.float with np.float64

* Replace np.int with np.int_

* Rerun pre-commit for newer pre-commit configuration

* Use builtin bool instead of np.bool_ based on the context

* 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

* Add bf16 pool2d and unify bf16 unit tests

* Add change default ops test

* Add bfloat16 softmax and gelu

* Add pass attr bfloat16_enabled_op_types

* Changes from review