* Update DDP for `torch.distributed.run`

* Add LOCAL_RANK

* remove opt.local_rank

* backend="gloo|nccl"

* print

* print

* debug

* debug

* os.getenv

* gloo

* gloo

* gloo

* cleanup

* fix getenv

* cleanup

* cleanup destroy

* try nccl

* return opt

* add --local_rank

* add timeout

* add init_method

* gloo

* move destroy

* move destroy

* move print(opt) under if RANK

* destroy only RANK 0

* move destroy inside train()

* restore destroy outside train()

* update print(opt)

* cleanup

* nccl

* gloo with 60 second timeout

* update namespace printing

* Slightly modify CLI execution

This simple change makes it easier to run the primary functions of this
repo (train/detect/test) from within Python. An object which represents
`opt` can be constructed and fed to the `main` function of each of these
modules, rather than having to call the lower level functions directly,
or run the module as a script.

* Update export.py

Add CLI parsing update for more convenient module usage within Python.

Co-authored-by: Lewis Belcher <lb@desupervised.io>

* Create shortcircuit in augment_hsv when hyperparameter are zero

* implement faster opt-in

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* EMA changes for pre-model's batch_size

* Update train.py

* Update torch_utils.py

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* Remove `/weights` directory

* cleanup

Be more user-friendly to new users

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* premature end of JPEG images

* PEP8 reformat

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* Update `check_file()`

* Update datasets.py

* supress wandb images size mismatch warning

* supress wandb images size mismatch warning

* PEP8 reformat and optimize imports

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* 'changes-in_dataset'

* Update datasets.py

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* Update README.md

* added hosted images

* added new logo

* testing image hosting

* changed svgs to pngs

* removed old header

* Update README.md

* correct colab image source

* splash.jpg

* rocket and W&B fix

* added contributing template

* added social media to top section

* increased size of top social media

* cleanup and updates

* rearrange quickstarts

* API cleanup

* PyTorch Hub cleanup

* Add tutorials

* cleanup

* update CONTRIBUTING.md

* Update README.md

* update wandb link

* Update README.md

* remove tutorials header

* update environments and integrations

* Comment API image

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* double spaces after section

* Update README.md

* Update README.md

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* train.py GPU memory fix

* ema

* cuda

* cuda

* zeros input

* to device

* batch index 0

* Ignore Seaborn plot warnings

* Update plots.py

* Update metrics.py

* Refactoring cleanup

* Update test.py

* Refactor models/export.py arguments

* cleanup

* cleanup

* remove opt from test()

* pass kwargs

* update comments

* revert accidental default change

* multiple --img options

* add comments

* Update test.py profiling

* half_precision to half

* inplace

* Multi-GPU default to single device 0

* Multi-GPU default to single device 0

* add space