* val.py refactor

* cleanup

* cleanup

* cleanup

* cleanup

* save after eval

* opt.imgsz bug fix

* wandb refactor

* dataloader to train_loader

* capitalize global variables

* runs/hub/exp to runs/detect/exp

* refactor wandb logging

* Refactor wandb operations (#4061)
Co-authored-by: Ayush Chaurasia <ayush.chaurarsia@gmail.com>

* AutoShape PosixPath support

Usage example:

````python
from pathlib import Path

model = ...
file = Path('data/images/zidane.jpg')

results = model(file)
```

* Update common.py

* Update README.md

* Update README.md

* Update README.md

* Add `--sync-bn` known issue

* Update train.py

* Update greetings.yml

* Update greetings.yml

* Add support for W&B Sweeps

* Update and reformat

* Update search space

* reformat

* reformat sweep.py

* Update sweep.py

* Move sweeps files to wandb dir

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

* `Detections()` class `print()` overload

* Update common.py

* fix visualize error

* Revert "fix visualize error"

* add visualise profile

Evaluation of 'best' and 'last' models will use the same params as the evaluation during the training phase. 
This PR fixes https://github.com/ultralytics/yolov5/issues/3907

* Update `dataset_stats()` for zipped datasets

@KalenMike

* cleanup

Fix inference from PIL source.

* Feature visualization update

* Save to jpg (faster)

* Save to png

* Create hubconf.py

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

* Albumentations integration

* ToGray p=0.01

* print confirmation

* create instance in dataloader init method

* improved version handling

* transform not defined fix

* assert string update

* create check_version()

* add spaces

* update class comment

* Hub models `map_location=device`

* cleanup

Fix for `KeyError: 'anchors'` error when start hyperparameter evolution:
```bash
python train.py --evolve
```

```bash
Traceback (most recent call last):
  File "E:\yolov5\train.py", line 623, in <module>
    hyp[k] = max(hyp[k], v[1])  # lower limit
KeyError: 'anchors'
```

* Update BGR2RGB ops

* speed improvements

* cleanup

* Create `utils/augmentations.py`

* cleanup

* Added the recording feature for multiple streams

Thanks for the very cool repo!!
I was trying to record multiple feeds at the same time, but the current version of the detector only had one video writer and one vid_path!
So the streams were not being saved and only were initialized with one frame and this process didn't record the whole thing.

Fix:
I made a list of `vid_writer` and `vid_path` and the `i` from the loop over the `pred` took care of the writer which need to work!

I hope this helps, Thanks!

* Cleanup list lengths

* batch size variable

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

* evolve command accepts argument for number of generations

* evolve generations argument used in evolve for loop

* evolve argument boolean fixes

* default to 300 evolve generations

* Update train.py
Co-authored-by: John San Soucie <jsansoucie@whoi.edu>
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* rotating an image according to its exif tag

* Update common.py

* Update datasets.py

* Update datasets.py

faster

* delete extraneous gpg file

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