ultralytics 8.0.97 confusion matrix, windows, docs updates (#2511)

Co-authored-by: Yonghye Kwon <developer.0hye@gmail.com>
Co-authored-by: Dowon <ks2515@naver.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Laughing <61612323+Laughing-q@users.noreply.github.com>

ultralytics/yolo/utils/__init__.py

@@ -8,7 +8,6 @@ import platform
 import re
 import subprocess
 import sys
-import tempfile
 import threading
 import urllib
 import uuid
@@ -414,12 +413,7 @@ def is_dir_writeable(dir_path: Union[str, Path]) -> bool:
     Returns:
         bool: True if the directory is writeable, False otherwise.
     """
-    try:
-        with tempfile.TemporaryFile(dir=dir_path):
-            pass
-        return True
-    except OSError:
-        return False
+    return os.access(str(dir_path), os.W_OK)
 
 
 def is_pytest_running():