Fix flowers dataset download problem

Update MKLDNN to 0.15, fix convolution integration

Revert "Disable in_place in batch_norm API. (#12736)"

Revert "Add Python Callstacks when Op::Run error (#12759)"

This reverts commit b2df1700.

This reverts commit f5d5d7b2.

Add attention lstm cpu forward

Add stack_op for DAM model

enhance test_analyzer to profile ditu inference demo

bug fix

* add is_test for while_op

* Change API

Add scope info in graphviz debug

* dist transpiler add control dependency var between send and recv

* fix async deps

* follow comments and refine

* fix deps connect for rpc ops

refine Node

* Add Python Callstacks when Op::Run error

* Skip op with sub-block

* refactor: refine callstack info's format

* Reshape only support matrix

* Polish Python code

* Fix UT

* Fix Py3

Feature/process lod grad