updates

fix

fix cpplint

fix

init remove storage op test case c++

remove source c++ files

c implementation done, just need to call batch/pad

added python api and validator

added pybind/de_pipeline stuff, fixed some compile errors, figure out how null py::function works

added tiny bit of doc

integrated with static batch methods

fixed some bugs

some more bug fixes and cleanup

ci fix

fix ci

ci fix

fix ci

added test_cases and debugged

addressed code review comments

addressed code review comments

ci fix

ci fix

addressed code review comments

addressed code review comments

fix complie error

more tests

address CI complains

fix ci

adress review comments

address review cmts

Merge pull request !1913 from xiefangqi/xfq_support_coco

- Support accepting Numpy of str as input
- Support batching strings
- Core logic of batch&pad is static
- Make Pad a utility function

change to use __add__ operation instead ds.concat

Initial commit for dataset op python

Added signature to barrier

Adde compiling barrier code

Rebasing, fixed new compile errors

Final fix for make_unique

Added pybind API for barrier

Fixed pyfunc invocation

python interface - sync_wait

!1 sync_wait python interface
* python interface - sync_wait

fix test

update test

update test

Added new test case

add test case

test for shuffle + batch

Added two-sync test case

Restrited that no shuffle after sync

Added sync to pipeline info

block first databuffer as well

Intelligently get batch size

Fix default case

Lock Pair shares among all iterators

Added fix for empty character

Fixed up test case formatting

Fix end of epoch in sync_wait

Fixing CI

adjust internal api

Signed-off-by: leonwanghui <leon.wanghui@huawei.com>