Fix BGR->RGB Bug in albumentations #8641 (#8695)

* Fix BGR->RGB Bug in albumentations https://github.com/ultralytics/yolov5/issues/8641

* Change transform methode from cv2 to numpy

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* Simplify

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* Update augmentations.py

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Glenn Jocher <[email protected]>

utils/augmentations.py

@@ -39,8 +39,9 @@ class Albumentations:
 
     def __call__(self, im, labels, p=1.0):
         if self.transform and random.random() < p:
-            new = self.transform(image=im, bboxes=labels[:, 1:], class_labels=labels[:, 0])  # transformed
-            im, labels = new['image'], np.array([[c, *b] for c, b in zip(new['class_labels'], new['bboxes'])])
+            new = self.transform(image=im[..., ::-1], bboxes=labels[:, 1:], class_labels=labels[:, 0])  # transformed
+            im = new['image'][..., ::-1]  # RGB to BGR
+            labels = np.array([[c, *b] for c, b in zip(new['class_labels'], new['bboxes'])])
         return im, labels