Merge pull request !801 from fary86/fix_checking_bug_of_prelu

Merge pull request !808 from zhoufeng/cmake-gvar-order

Merge pull request !800 from lianliguang/master

Merge pull request !793 from yanghaitao/yht_err_msg_num_rows_zero

Merge pull request !705 from chujinjin/add_pynative_cache

Merge pull request !788 from caojian05/mindspore_master_dev

Merge pull request !751 from zjun/remove_enable_hccl

Merge pull request !784 from 梅晓蔚/master

Merge pull request !746 from lirongzhen1/bp_reducescatter

Merge pull request !785 from wukesong/maxpool_alexnet

Merge pull request !694 from rick_sanchez/master

Merge pull request !700 from penn/validate_bprop_rules

Merge pull request !761 from Simson/push-to-opensource

Merge pull request !743 from guozhijian/add_perf_test_for_mindrecord

Merge pull request !665 from caojian05/mindspore_master_dev

Merge pull request !778 from fary86/fix_bug_of_ApplyRMSProp

Merge pull request !750 from liubuyu/master

Merge pull request !731 from fary86/remove_extra_empty_string_in_log

Merge pull request !779 from JunhanHu/sampler_pylint

Merge pull request !603 from liyong126/update_pk_sampler

Merge pull request !775 from Etone.Chan/master

Merge pull request !670 from wandongdong/master

Merge pull request !754 from dinghao/fix_tensor

Merge pull request !747 from kisnwang/change-cpu-kernel-dir

Merge pull request !753 from zhangbuxue/dock_FloorMod_GreatEqual_NotEqual

Merge pull request !671 from EricZ/master

Merge pull request !466 from h.farahat/deepcopy

Merge pull request !738 from zhaozhenlong/fix-issues-conv2d-example

Merge pull request !711 from ZiruiWu/mindspore_master_only

Merge pull request !718 from zhouyuanshen/master

Merge pull request !663 from flywind/fix_bug

Conv2D
Conv2dBackpropInput
SigmoidCrossEntropyWithLogits
SoftmaxCrossEntropyWithLogits
SparseSoftmaxCrossEntropyWithLogits
SparseApplyAdagrad