* "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.

refine fc op

lookup table size fix

fix inference doc url error

* dist transpile can pass startup program by argument

* update API.spec

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

Make cross_entropy_op supporting tensor

Polish API of exception holder

test and doc IR Graph

disable anakin temporary

add export_for_deployment flag to save_inference_model

Add tensorrt softmax

* make inference_anakin_test SERIAL

* add anakin compiler from github source code

* fix inference_lib_dist error

* add comment

* update anakin.cmake

* fix anakin-NOTFOUND compiler error

* modify the anakin_model download dir

Revert "Refine elementwise_add op"

* hide misc APIs

* update

* fix transformer test

* update API.spec