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* add ufmt as code formatter

* cleanup

* quote ufmt requirement

* split imports into more groups

* regenerate circleci config

* fix CI

* clarify local testing utils section

* use ufmt pre-commit hook

* split relative imports into local category

* Revert "split relative imports into local category"

This reverts commit f2e224cde2008c56c9347c1f69746d39065cdd51.

* pin black and usort dependencies

* fix local test utils detection

* fix ufmt rev

* add reference utils to local category

* fix usort config

* remove custom categories sorting

* Run pre-commit without fixing flake8

* got a double import in merge
Co-authored-by: Nicolas Hug <nicolashug@fb.com>

* Replace in test_datasets*

* Replace in test_image.py

* Replace in test_transforms_tensor.py

* Replace in test_internet.py and test_io.py

* get_list_of_videos is util function still use get_tmp_dir

* Fix get_list_of_videos siginiture

* Add get_tmp_dir import

* Modify test_datasets_video_utils.py for test to pass

* Fix indentation

* Replace get_tmp_dir in util functions in test_dataset_sampler.py

* Replace get_tmp_dir in util functions in test_dataset_video_utils.py

* Move get_tmp_dir() to datasets_utils.py and refactor

* Fix pylint, indentation and imports

* import shutil to common_util.py

* Fix function signiture

* Remove get_list_of_videos under context manager

* Move get_list_of_videos to common_utils.py

* Move get_tmp_dir() back to common_utils.py

* Fix pylint and imports
Co-authored-by: Nicolas Hug <contact@nicolas-hug.com>

Co-authored-by: Nicolas Hug <nicolashug@fb.com>

Co-authored-by: Philip Meier <github.pmeier@posteo.de>

* extend DistributedSampler to support group_size

* Fix lint

* move sampler into TV core. Update UniformClipSampler

* Fix reference training script

* Skip test if pyav not available

* change interpolation from round() to floor() as round(0.5) behaves differently between py2 and py3