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 !662 from zhangbuxue/fix-reviewboot

This reverts commit ea6958c50a.

This reverts commit 252ed4f7c9.

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

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

Signed-off-by: Hoai Linh Tran h00472437 <hoai.linh.tran@huawei.com>

Add optimizer checking: For a group of passes in "optimizer", if flagged then it will check and collect the newly generated nodes without types (i.e. abstract() == nullptr).
Before calling Renormalize(), the optimizer will check if there is any node needed retyping. If not the Renormalize pass will not be called.
Add checking for non-null abstract but still needs renorm;
Add flags to Substitution to help watching Renormalize

Simpler pass result checker, change Bool to Enum type

Merge pull request !215 from penn/fix_print_bprop_error

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>