* Replace 'ground truth' with 'labels'

* Using torch... update

* Use pathlib instead of low-level module

* Use pathlib instead of low-level module

* Update detect.py

* Update test.py

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

* Create flatten_recursive() helper function

* cleanup

* print torch version

* Increment train, test, detect runs/

* Update ci-testing.yml

* inference/images to data/images

* move images

* runs/exp to runs/train/exp

* update 'results saved to %s' str

* autoshape update for PIL greyscale inputs

* autoshape update for PIL greyscale inputs

* Change optimizer parameters group method

* Add torch nn

* Change isinstance method(torch.Tensor to nn.Parameter)

* parameter freeze fix, PEP8 reformat

* freeze bug fix
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* W&B feature improvements

This PR add:
* Class to id labels. Now, the caption of bounding boxes will display the class name and the class confidence score.
* The project name is set to "Yolov5" and the run name will be set to opt.logdir

* cleanup

* remove parenthesis on caption
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* Add wandb metric logging and bounding box debugging

* Improve formatting, readability

* Remove mutliple path for init, improve formatting

* Add wandb params

* Remove typecasting in bbox coordinates and reformat

* Cleanup

* add wandb to requirements.txt

* minor updates to test.py

* general reorg

* reduce --log-imgs to 10

* clean wandb import

* reverse wandb import assert

* add except AssertionError to try import

* move wandb init to all global ranks

* replace print() with logger.info()

* replace print() with logger.info()

* move wandb.init() bug fix

* project PosixPath to basename bug fix
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* torch 1.7.0 compatibility updates

* add inference verification

* Move generated *.json annotations into runs/test

* list and string robust

* Adding --output and --save-conf options to test.py

* Update help fields

* Update test.py

* Make arguments and comments uniform with test.py

* Remove previous and print save_dir on finish
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* README Update

* Update README.md

* README Update

* Update README.md

* Precision-Recall Curve feature update

* sentinel value update

* add contrast to conf/class against bbox rectangle color

* added feature to save conf in txt labels

* Update general.py

* Update detect.py

* Update detect.py

* Update detect.py

save_conf variable removed as only used once, so we can use opt.save_conf instead.

* Update detect.py

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

Co-authored-by: swsong <swsong@stratosphere.mobi>