This reverts commit ea6958c50a.

Merge pull request !264 from xychow/remove-unnecessary-cache-and-add-cache

Merge pull request !621 from liyong126/mindrecord_ut

Merge pull request !554 from huanghui/fix_derelu_fusion_pass

Merge pull request !492 from YuJianfeng/allgather

Merge pull request !556 from Chong/partition

add cache for PythonPrimEvaluator. Be careful that
 the infer function of PythonPrimitive in python code should
 be idempotent.

Merge pull request !390 from gukecai/master

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

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 !425 from yanghaitao/yht_textfiledatasetv2

Merge pull request !472 from YuJianfeng/master

Merge pull request !478 from fary86/fix_log_and_ir_issues

Merge pull request !340 from ougongchang/master

Merge pull request !246 from vlne-v1/I1E3PI-opt-pass-adjust-allreduce-apply-weight-decy-seq

clean clang format errors and cpplint errors

add some test cases for histogram summary operator

Merge pull request !350 from lianliguang/chang-tuple-output-to-make-tuple

Merge pull request !317 from huanghui/derelu_fusion_pass

Merge pull request !183 from JunhanHu/cpp_sampler

Merge pull request !346 from laiyongqiang/develop

Merge pull request !243 from h.farahat/nested_repeat

Merge pull request !289 from YuJianfeng/find_op

Merge pull request !260 from lianliguang/refactor-padding-strategy

Merge pull request !232 from Xiaoda/model-memory-cost-in-auto-parallel

Merge pull request !226 from wangnan39/expend_conv_stride_to_2d