* 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

Refine detection mAP in metrics.py.

[1.1] remove unused code in paddle_inference_api.h

[1.1] fix python encoding problem in wmt16 related test

Add sequence_reverse_op

[1.1] fix erase end in generate proposals op

[1.1] Make reshape_op reuse input.

[1.1] Fix ubuntu dockerfile

Unify API of mixed_vector in GPU and CPU

Fix threadpool

remove unused method from naive executor

Add dropout att new 1.1 merge

test=develop

test=develop

fix multi device dependency issue

test=develop

test=develop

test=develop

disable dist transformer

test=develop

test=develop

test=develop

avoid blocking everyone

please fix offline

test=develop

test=develop

fix avx error

test=develop

Accelerate Sequence Pool Grad Op

test=develop

Fix transformer unittest