Fix Windows non-UTF source filenames (#4524)

Co-authored-by: Kayzwer <68285002+Kayzwer@users.noreply.github.com>

ultralytics/utils/patches.py

@@ -13,20 +13,45 @@ import torch
 _imshow = cv2.imshow  # copy to avoid recursion errors
 
 
-def imread(filename, flags=cv2.IMREAD_COLOR):
+def imread(filename: str, flags: int = cv2.IMREAD_COLOR):
+    """Read an image from a file.
+
+    Args:
+        filename (str): Path to the file to read.
+        flags (int, optional): Flag that can take values of cv2.IMREAD_*. Defaults to cv2.IMREAD_COLOR.
+
+    Returns:
+        (np.ndarray): The read image.
+    """
     return cv2.imdecode(np.fromfile(filename, np.uint8), flags)
 
 
-def imwrite(filename, img):
+def imwrite(filename: str, img: np.ndarray, params=None):
+    """Write an image to a file.
+
+    Args:
+        filename (str): Path to the file to write.
+        img (np.ndarray): Image to write.
+        params (list of ints, optional): Additional parameters. See OpenCV documentation.
+
+    Returns:
+        (bool): True if the file was written, False otherwise.
+    """
     try:
-        cv2.imencode(Path(filename).suffix, img)[1].tofile(filename)
+        cv2.imencode(Path(filename).suffix, img, params)[1].tofile(filename)
         return True
     except Exception:
         return False
 
 
-def imshow(path, im):
-    _imshow(path.encode('unicode_escape').decode(), im)
+def imshow(winname: str, mat: np.ndarray):
+    """Displays an image in the specified window.
+
+    Args:
+        winname (str): Name of the window.
+        mat (np.ndarray): Image to be shown.
+    """
+    _imshow(winname.encode('unicode_escape').decode(), mat)
 
 
 # PyTorch functions ----------------------------------------------------------------------------------------------------
@@ -34,12 +59,17 @@ _torch_save = torch.save  # copy to avoid recursion errors
 
 
 def torch_save(*args, **kwargs):
-    """Use dill (if exists) to serialize the lambda functions where pickle does not do this."""
+    """Use dill (if exists) to serialize the lambda functions where pickle does not do this.
+
+    Args:
+        *args (tuple): Positional arguments to pass to torch.save.
+        **kwargs (dict): Keyword arguments to pass to torch.save.
+    """
     try:
-        import dill as pickle
+        import dill as pickle  # noqa
     except ImportError:
         import pickle
 
     if 'pickle_module' not in kwargs:
-        kwargs['pickle_module'] = pickle
+        kwargs['pickle_module'] = pickle  # noqa
     return _torch_save(*args, **kwargs)