Add ultralytics pip package (#11529)

* Add ultralytics pip package

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Add requirements.txt locations

* Update requirements.txt

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

---------

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

classify/train.py

@@ -300,7 +300,7 @@ def main(opt):
     if RANK in {-1, 0}:
         print_args(vars(opt))
         check_git_status()
-        check_requirements()
+        check_requirements(ROOT / 'requirements.txt')
 
     # DDP mode
     device = select_device(opt.device, batch_size=opt.batch_size)