option should not be overridden by subsequent options of the same module

* fix_gan_gpu (#2864)

* fix dir and gpu

* infer_cgan_dcgan (#2806)

add run shell and infer shell for cgan and dcgan
update infer.py for gan and dcgan

* Fix doc and train.py of icnet.

* Add usage for distribute Light-NAS searching.

* Refine usage doc of PaddleSlim.

* Use print instead of logger.

* Move light-nas-block.png to tutorial.

* Add Copyright for icnet.

* add mask fpn r50 2x & minor fix for MODEL ZOO doc (#2747)

* cherry-pick bug fix for release/1.5

* fix mask eval for multi-batch (#2772)

* cherry-pick bug fix for release/1.5

* fix faster rcnn use im_shape (#2779)

* cherry-pick bug fix for release/1.5

* refine bbox_normalize in infer.py (#2781)

* refine bbox_normalize in infer.py

* add is_bbox_normalize

* rename _forward to build

* check callable

* cherry-pick bug fix for release/1.5

* Prevent module instance from modifying global config (#2790)

some of the global config values are reference type, e.g., objects, lists or
dicts, if the created module instances modify those values (see FPN and
spatial_scale), global config will reflect these changes, and instances of the
same class created later will inherit the changed values

* Fix command line parsing for non module options (#2839)

* fix save_inference_model cannot find feed vars (#2842)

* fix save_inference_model cannot find feed vars

* remove comment

* fix format

* add comment for pruned var

* add log for prune

* Fix train+eval in PaddleDetection(#2847)

* resolve conflict merge error

* reset data_feed

update cherry pick

Cherry pick gan

* fix pickle.load in ctcn_reader for python3 (#2679)

fix pickle.load to fit both python3 and 2

* fix subprocess not stop when press ctr+c to stop main process (#2681)

* add cuda check to show errors when run on paddle compiled with cpu only (#2732)

* add cuda check to show errors when run on paddle compiled with cpu only

* change use_cuda to use_gpu in the error infomation to be consistent with code

* Fix some docs. (#2698)
* Unify COCO and VOC
* Change PASCAL to Pascal
* Unify dataset/coco

* [cherry pick] fix configs in paddle detection

* [cherry pick] add depth for ResNetC5

* improve quality of images

* update url for install doc

* add readme for ctcn metrics calculation

* fix code format in metrics/detections/README.md

* fix code format and add ``` in code lines

* Upload mmpms

* Adapt to py2

* change seq2seq to padding impl; test=develop

* add bleu result; test=develop

* fix formate; test=develop

* fix formate; test=develop