remove usage of deprecated albumentations Flip() transform (#2318)

Author: AdeelH

rastervision_pytorch_backend/rastervision/pytorch_backend/examples/semantic_segmentation/utils.py

@@ -2,7 +2,8 @@
 import albumentations as A
 
 example_rgb_transform = A.Compose([
-    A.Flip(),
+    A.VerticalFlip(),
+    A.HorizontalFlip(),
     A.Transpose(),
     A.RandomRotate90(),
     A.ShiftScaleRotate(),
@@ -38,7 +39,8 @@
 # not all transforms work with more than 3 channels, here are
 # some of the ones that do
 example_multiband_transform = A.Compose([
-    A.Flip(),
+    A.VerticalFlip(),
+    A.HorizontalFlip(),
     A.Transpose(),
     A.RandomRotate90(),
     A.ShiftScaleRotate(),