when while_grad, it writes multiple @EMPTY@ with no VarDesc.

Remove unused six and missing six import

* "fix bug"

* "add test case"

fix the paddle script causes 'command not found' error'

Move matplotlib dependencies to MANYLINUX1_DEPS to avoid erase

* add rw lock test

* optimize read_write and wirte_read test

This reverts commit bf3c3496.

Optimize selected rows for dist lookup table with rwlock 

add mklml depends for anakin

Sampling id op

Port print_function and make more efficient

Port pybind11 and python code to support py3 CI test

Add libpng dependencies to yum and correct libnccl dir

Refine gru cpu forward

Error message refine: add demangle api to attribute type

polish high frequency enforce error message

* remove patchelf in windowls

* "follow comment"

fix specific cudnn include and library path

* 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.