* add ScaleOpVarTypeInference for scale op

* scale op support scale selected rows

* optimize code

* use FindVar

* use FindVarRecursive in ScaleOpVarTypeInference

* refine dist train RPC deps

* clean up

* clean up

* fix ut

* remove input for fetch_barrier

* follow comments

Merge pull request from #12843 from NHZlX:fix_ssa_bug_for_trt

(cherry picked from commit 1600ba86)

* fix auc layer and add check for auc op

* use input to check if states are inited

* optimize code

Add dependency to send recv

* Disable in_place in batch_norm API.

Optimize selected rows for dist lookup table with rwlock 

This reverts commit bf3c3496.

* Remove Data Sharing between input and output in scatter_op

* Removed data sharing in backward op

* "cherry picked operators changes"

* "remove duplicated code"

* "add constant setter"

* "add get expected kernel"

* "fix ci"

* "add fill constant"

* Add three modes for prelu_op.

Add flatten op interface and enhance APIs about detection to support variable-length image. (#12422)

* add flatten api&enhance detection api

* unify shape_op data type

* update API.spec

* Fix infer shape of crop op.
* Speed crop op.