Merge pull request !700 from penn/validate_bprop_rules

Merge pull request !731 from fary86/remove_extra_empty_string_in_log

Merge pull request !494 from zhoufeng/cmake-sub

Merge pull request !687 from candanzg/summary_tag_check

Signed-off-by: candanzg <zhangshucheng@huawei.com>

Merge pull request !659 from geekun/main_yjk

This reverts commit ea6958c50a.

Merge pull request !454 from candanzg/bug_cast_op

Signed-off-by: candanzg <zhangshucheng@huawei.com>

Merge pull request !340 from ougongchang/master

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

Merge pull request !442 from zhangbuxue/perfect_comparion_op

clean clang format errors and cpplint errors

add some test cases for histogram summary operator

format code

remove test case for fp64

add back scalar manipulation

remove save graph

use unpack graph primitive instead

add testcases for all grad interface

remove debug log

format code

remove dumpfuncgraph

resolve clang-format

resolve reviews

resolve cpplint

fix review

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