Add https://www.reddit.com/r/Ultralytics/ badge (#13284)

* Refactor code for speed and clarity

* Update README.zh-CN.md

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

---------

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Co-authored-by: UltralyticsAssistant <web@ultralytics.com>

utils/augmentations.py

@@ -18,7 +18,8 @@ IMAGENET_STD = 0.229, 0.224, 0.225  # RGB standard deviation
 
 
 class Albumentations:
-    # YOLOv5 Albumentations class (optional, only used if package is installed)
+    """Provides optional data augmentation for YOLOv5 using Albumentations library if installed."""
+
     def __init__(self, size=640):
         """Initializes Albumentations class for optional data augmentation in YOLOv5 with specified input size."""
         self.transform = None
@@ -378,7 +379,8 @@ def classify_transforms(size=224):
 
 
 class LetterBox:
-    # YOLOv5 LetterBox class for image preprocessing, i.e. T.Compose([LetterBox(size), ToTensor()])
+    """Resizes and pads images to specified dimensions while maintaining aspect ratio for YOLOv5 preprocessing."""
+
     def __init__(self, size=(640, 640), auto=False, stride=32):
         """Initializes a LetterBox object for YOLOv5 image preprocessing with optional auto sizing and stride
         adjustment.
@@ -405,7 +407,8 @@ class LetterBox:
 
 
 class CenterCrop:
-    # YOLOv5 CenterCrop class for image preprocessing, i.e. T.Compose([CenterCrop(size), ToTensor()])
+    """Applies center crop to an image, resizing it to the specified size while maintaining aspect ratio."""
+
     def __init__(self, size=640):
         """Initializes CenterCrop for image preprocessing, accepting single int or tuple for size, defaults to 640."""
         super().__init__()
@@ -424,7 +427,8 @@ class CenterCrop:
 
 
 class ToTensor:
-    # YOLOv5 ToTensor class for image preprocessing, i.e. T.Compose([LetterBox(size), ToTensor()])
+    """Converts BGR np.array image from HWC to RGB CHW format, normalizes to [0, 1], and supports FP16 if half=True."""
+
     def __init__(self, half=False):
         """Initializes ToTensor for YOLOv5 image preprocessing, with optional half precision (half=True for FP16)."""
         super().__init__()