Merge pull request !221 from chentingting/support_distributd_GatherV2_operator

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

Merge pull request !228 from liyong126/mindrecord_subsetrandom_sampler

Merge pull request !150 from leonwanghui/dockerfile

Merge pull request !218 from caifubi/dev-rm-py36-in-package

Merge pull request !219 from ZhangQinghua/master

Merge pull request !240 from zhangbuxue/normalize_log_in_optimizer_in_python

Merge pull request !188 from zhangbuxue/fix_pow_bprop

Merge pull request !236 from lianliguang/master

Merge pull request !227 from ZhouFeng/delete-abandoned-script

Merge pull request !95 from dengwentao/protobuf

Merge pull request !206 from chenfei/master

Total Renormalizes:
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69.05010 --> 62.28941
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Merge pull request !234 from suteng/revert-merge-231-master

Merge pull request !220 from yangzhenzhang/dropoutdomask

Merge pull request !230 from SanjayChan/master

Merge pull request !233 from jjfeing/master

Merge pull request !231 from chentingting/add_bool_type_check_in_comm_op

Merge pull request !223 from zyli2020/master

Merge pull request !169 from xychow/fix-manager-children-issue

Merge pull request !30 from biffex/incubator-momentum-duplicate-mul-constant

Merge pull request !186 from guozhijian/fix_mindpage_error

Merge pull request !229 from panfengfeng/panff/skip_ut_test_cases

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