This reverts commit f0318794.

* support for any one cuda device

* Revert "support for any one cuda device"

This reverts commit 0197e4e2ef18ec41cc155f3ae2a0face5b77e1e9.

* support runnning for anyone cuda device

* using safe CUDAGuard rather than intrinsic CUDASetDevice

* supplement a header dependency (test passed)

* Support for  arbitrary GPU device.

* Support for arbitrary GPU device.

* add docs for two method to control devices

* [WIP] Keypoints inference on C2 models work

* Training seems to work

Still gives slightly worse results

* e2e training works but gives 3 and 5 mAP less

* Add modification proposed by @ChangErgou

Improves mAP by 1.5 points, to 0.514 and 0.609

* Keypoints reproduce expected results

* Clean coco.py

* Linter + remove unnecessary code

* Merge criteria for empty bboxes in has_valid_annotation

* Remove trailing print

* Add demo support for keypoints

Still need further cleanups and improvements, like adding fields support for the other ops in Keypoints

* More cleanups and misc improvements

* Fixes after rebase

* Add information to the readme

* Fix md formatting

* Add new section "Projects using maskrcnn-benchmark".

* Update README.md

update the format.

* Update README.md

* Add coco_2017_train and coco_2017_val

* Update README.md

Add the instructions about COCO_2017

* Add new section "Projects using maskrcnn-benchmark".

* Update README.md

update the format.

* Update README.md

* add support for pascal voc dataset and evaluate

* optimization for adding voc dataset

* make inference.py dataset-agnostic; add use_difficult option to voc dataset

* handle voc difficult objects correctly

* Remove dependency on lxml plus minor improvements

* More cleanups

* More comments and improvements

* Lint fix

* Move configs to their own folder

Fix a small typo