* support sparse gradients
test=develop

test=develop

* Fix the order when sorting operators.

test=develop

* Enable transfomer compare test item.

test=develop

* Use set to replace vector.

test=develop

* Fix the node's sort issue when the graph is changed.

test=develop

* Clean code

test=develop

* Fix the node's sort issue when the graph is changed.

test=develop

* Clean code

test=develop

* follow comments. test=develop

* Fix typo

* fix compile error. test=develop

* merge develop branch. test=develop

* Remove set_equal

* Polish code

* Delete unused functions

test=develop

* polish code. test=develop

* follow comment

* polish code.

* fix windows compile error. test=develop

* fix op handle.

* rerun ci. test=develop

* rerun ci. test=develop

* rerun macci. test=develop

* polish code. test=develop

* rewrite sort code. test=develop

* remove unused code. test=develop

* fix tests. test=develop

* fix conflict. test=develop

* follow comment. test=develop

* merge develop branch. test=develop

* fix tests. test=develop

* remove ToTypeIndex. test=develop

* rerun ci. test=develop

test=develop

* refine GraphCheck
test=develop

* fix ci fail
test=develop

Fix code to support cpplint syntax check

test=develop

* fix graph num hang test=develop

* re-enable tests test=develop

* re-enable graph num check test=develop

* fix multi device pass role check test=develop

* add GraphNum

test=develop

* add graph number check in parallelExecutor

test=develop

* fix transformer_model bug

test=develop

* fix graph num

* make fc fuse work with ditu rnn
* add ditu rnn data download to CMAKE