* fix infer doc and config default

* refine dataset exists

* fix None proc

* add rpn recall function and class-aware rpn

* fix dir and gpu

* fix yolov3 subprocess not exit

* refine print

* fix ptb reader and remove useless language model; test=develop

* add ptb reader; test=develop

* Add usage for distribute Light-NAS searching.

* Refine usage doc of PaddleSlim.

* using new load api

* test=develop, add license

* fix2744

* remove useless comment

* make code less ugly

* optimize error message when result is none

add copyright for cycle_gan and se_resnext

* fix ptb author bug; test=develop

* fix ptb author bug; test=develop

test=develop

fix ceroot path bug

* fix save_inference_model cannot find feed vars

* remove comment

* fix format

* add comment for pruned var

* add log for prune

* Update mnist_dygraph.py

fix bug

* add muti card support for se_resnext

* add some description to readme.md

* add ce for cyclegan

* fix code style

* add ce for ptb_lm

* fix resnet for resnet34

* fix ResNet18 and ResNet34

* update modelzoo and fix configs

* fix configs

* fix resnet bn

* update readme

* rm useless png

* fix bn warning

Fix the leaving out of subprocess importing.