Cleaned up code

* Add InfiniteDataLoader

Only initializes at first epoch. Saves time.

* Moved class to a better location

Don't load the entire torchvision library just for nms when the function is already in the torch library.

Fixes #822

`init_seeds` from `torch_utils` import is being overwritten by function `init_seeds` in `general.py`

eps reduced to 1e-9 for additional precaution.

* initial commit

* add weight backup dir on resume

* Fix ema error in DDP mode

* Update train.py
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* single command --resume

* else check files, remove TODO

* argparse.Namespace()

* tensorboard lr

* bug fix in get_latest_run()