* PyTorch Hub and autoShape update

* comment x for imgs

* reduce comment

* 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>

* 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

* torch 1.7.0 compatibility updates

* add inference verification

* expand imports

* optimize

* miss

* fix