Merge pull request !4688 from amongo/FixBoolParse

Merge pull request !4758 from VectorSL/nhwc-support

Merge pull request !4831 from byweng/add_test

add testcase of st

Merge pull request !4754 from hexia/add_http_to_st_serving

Merge pull request !4744 from lichen/support_bert

Merge pull request !4796 from xiefangqi/fix_randomdata_ut

Merge pull request !4782 from islam_amin/bbox_class

Merge pull request !4689 from zhangbuxue/add_check_for_user_define_bprop_in_Pynative_mode

implment pause in MapOp, added more to callback

add ds_callback

- Initial drop of Python DSCallback

- Pybind DSCallback

- Pybind DSCallback

added callback to mapOp

- de_pipeline DSCallback

- de_pipeline DSCallback

add test case, segfault for now

fix seg fault

- de_pipeline DSCallback

remove 1 line

update callback test case, now works

use builder class for mapOp callback

- de_pipeline DSCallback

- de_pipeline DSCallback

- de_pipeline DSCallback

better test case

minor fix

add comments and minor clean ups

get rid of nullptr in MapOp, use other flag instead

fix a bug ParseMapOp only takes 1 callback

- Added WaitedDSCalabck

refactor callback param

fix text case incorrect number

- added testing

fix cpp test case

- added testing

- revert back lenet changes

- cleanup test_callbacks.py

- cleanup test_callbacks.py

fix CI stage I

fix CI stage II

fix CI and update epoch counter

- add validation
- add more testing  test_callbacks.py

use random data op to do tests

adjust when to call EpochBegin/End

- add repeat with callback

- addressing reviewers' comments

- docstring and CI fixes

- docstring and CI fixes

- docstring and CI fixes

- rebase with upstream/master

fix cpp test case

fix review comments

addr review cmts, add test case

Merge pull request !4685 from ZPaC/master-supports-export-server-ckpt

Merge pull request !4696 from jiangzhiwen/jzw/c_api_csv

Merge pull request !4722 from lijiaqi/modify_error_type

Merge pull request !4622 from hexia/http_init

Merge pull request !4498 from heleiwang/gnn_distributed

Merge pull request !4690 from baihuawei/categorical

Merge pull request !4723 from yangzhenzhang/concat-more-than-3-tensors

Merge pull request !4422 from xiefangqi/xfq_c++api_randomdata

Merge pull request !4701 from guozhijian/fix_concat_get_dataset_size_err

Merge pull request !4669 from zhangxinfeng3/master

Merge pull request !4699 from danishnxt/GPU_two

try to display image

lint py fix 2

nms_py_file test value fix

lint fix

Merge pull request !4614 from zhoufeng/code-compile-performance

Merge pull request !4425 from fary86/fix_if_no_return_coredump

Merge pull request !4650 from yangzhenzhang/embedding-lookup-auto-parallel

Signed-off-by: zhoufeng <zhoufeng54@huawei.com>

Merge pull request !4643 from yihuaijie/dev