This reverts commit ac33c0ca.

* add api

* temp save

* revert

* copytocpu async ok

* fix style

* copy sync ok

* fix compile error

* fix compile error

* api done

* update python async api

* fix compile

* remove async python api; add c++ async unittest

* remove python async api

* update unittest

* update unittest

* add C++ unittest for copytensor

* add unittest

* update namespace utils to class TensorUtils

* add unittest

* update unittest

* update unittest

* update code style

* update code style

* update unittest

* add_roi_align_npu

* update

* update

* update

* use spinlock in auto growth, test=develop

* refine,test=develop

* fix cmaklist for new executor, test=develop

* refine, test=develop

* refine, test=develop

* Modify ci time count & fix resnet50_quant multi_thread tests

* fix wrong time variable

* temporary change

* fix for expand_v2

* changes after review, activated ppyolov inference test

* Enable BF16 for creating global tensor and reduce_mean.

* Functional test with small model.

* fix index tensor leak in __setitem__

* fix another usage of PyTuple_Pack

* refine code

* refine code

* handle None index

* add Py_DecRef

* revert ut

* refine code

* merge develop

* use RAII

* follow comments

* add fetch, test=develop

* fix fetch2op, test=develop

* fix fetch2op, test=develop

* refine, test=develop

* fix fetch ctx, test=develop

* add wait, test=develop

* rename fetch2 to fetch_v2, test=develop

* merge, test=develop

* Add no_sync in data parallel for dynamic graph

* modify UT of no_sync

* delete test_parallel_dygraph_dataparallel_no_sync.py

* add test_parallel_dygraph_no_sync.py

* modify run_trainer_with_spawn in UTs

* Add UT of complex control flow in no_sync

* add specific descriptions and notes for no_sync

* check code style

* modify UT's TIMEOUT in CMakeLists.txt

* fix bmm bug

* bmm style

* fix bmm

* Small corrections.

* Fix lr for bf16.

* Revert some changes.

* - concat refactoring draft

* - cmpilation fixes

* - yet another compilation fix

* - fix

* - compilation fix

* - fixes to compilation

* - another compilation fix

* - fix

* - Added overloaded AcquirePrimitiveDesc for concat

* - fix

* - reserve introduced

* - UT fixes

* - test concat int8 improved

* - fixes

* - fix to crash

* - lint fixes

* - fixes after review

* - some other fixes from review

* add conv_op_npu and test

* add more tests

* clean headers & support fp16

* update

* add pool2d_op_npu and test

* update

* update pool2d_backward_navie

* clean headers