Merge pull request !506 from JunhanHu/multiprocess_pyfunc

Merge pull request !406 from Peilin/first-row-crc-check

Merge pull request !460 from xulei/filter_master

Merge pull request !404 from JunhanHu/python_sampler_for_cpp_dataset

addressed code review comments. added check in python layer to exclude directories and to raise an error if a pattern does not match any file

fixed clang format

fixed cppcheck

fixed cppcheck (used std::accumulate and std::copy_if). regenerated tfrecord file to contain correct header, it was a dummy header before

fixed cppcheck: added const reference for string parameter for lambdas, fixed clang format: whitespace adjustments

more clang whitespace fixes...

changed print to logger.info

Merge pull request !463 from ms_yan/take_op_merge

Merge pull request !427 from pengyanjun/fix_dataset_api_description

Merge pull request !435 from anthonyaje/fix_serdes_dataset

Merge pull request !333 from jiangzhiwen/dataset/skip

Merge pull request !434 from h.farahat/multi_itr_bug

Add new test cases

Merge pull request !422 from ms_yan/Generator_distri

Merge pull request !416 from xiefangqi/br_fix_apply_comment

Merge pull request !378 from h.farahat/multi_itr

-- Iterator list is keeping  all created iterators wihtout cleaning them up
-- alter tree modifies the original.

Merge pull request !183 from JunhanHu/cpp_sampler

This reverts commit 5c2ded8d8e.

Merge pull request !243 from h.farahat/nested_repeat

Merge pull request !318 from pengyanjun/fix_get_cladd_indexing_warning

Merge pull request !273 from liyong126/mindrecord_subset_sampler_python

adjust internal api

Merge pull request !194 from pengyanjun/fix_dataset_para_validator_check

Merge pull request !165 from ghzl/use-mindspore-instead-of-mstype-in-example