GitLab

* add yapf and isort to travis

* minor formatting

* remove blank lines

* skip unit tests for progressbar when python2

* update travis to ubuntu 16.04

* use a newer version ffmpeg

* add -y to add-apt-repository

* Make latest symlink relative. Add tests

* Skip test_save_checkpoint in the absense of torch

* Fix pep8 in test_runner

* Import runner only if torch import has succeeded

* flow_warp_c

* flow_warp_c

* beautify format

* beautify format

* beautify format

* beautify format

* add Cython

* modify

* fix details

* fix details

* fix type

* add iminvert

* fix for flake8

* minor improvement

* add test for iminvert

* fix for flake8

* fix for flake8

* revise __init__

* revise __init__

* fix the time estimation when resuming from a checkpoint

* fix the time estimation when resuming from a checkpoint

* support str type for loggers

* fix yaml dump tests