Refactor: convert device patches to function-based initialization

- Replace module-level device patch execution with initialize_device() function
- Update all image example files to explicitly call device initialization
- Remove flake8 noqa comments that are no longer needed

This prevents automatic execution of device-specific patches on import and
gives scripts explicit control over when device initialization occurs.

Signed-off-by: Davide Colì <davide.coli@secomind.com>

Author: davide1992-light

examples/image/classify-full-frame.py

@@ -1,7 +1,9 @@
 #!/usr/bin/env python
-# flake8: noqa F401
 
-import device_patches  # Device specific patches for Jetson Nano (needs to be before importing cv2)
+# Device specific patches for Jetson Nano (needs to be before importing cv2)
+from device_patches import initialize_device
+
+initialize_device()
 
 try:
     import cv2

examples/image/classify-image.py

@@ -1,8 +1,9 @@
 #!/usr/bin/env python
-# flake8: noqa F401
 
-import device_patches  # Device specific patches for Jetson Nano (needs to be before importing cv2)  # noqa: F401
+# Device specific patches for Jetson Nano (needs to be before importing cv2)
+from device_patches import initialize_device
 
+initialize_device()
 try:
     import cv2
 except ImportError:

examples/image/classify-video.py

@@ -1,7 +1,9 @@
 #!/usr/bin/env python
-# flake8: noqa F401
 
-import device_patches  # Device specific patches for Jetson Nano (needs to be before importing cv2)
+# Device specific patches for Jetson Nano (needs to be before importing cv2)
+from device_patches import initialize_device
+
+initialize_device()
 
 try:
     import cv2

examples/image/classify.py

@@ -1,7 +1,9 @@
 #!/usr/bin/env python
-# flake8: noqa F401
 
-import device_patches  # Device specific patches for Jetson Nano (needs to be before importing cv2)
+# Device specific patches for Jetson Nano (needs to be before importing cv2)
+from device_patches import initialize_device
+
+initialize_device()
 
 try:
     import cv2

examples/image/device_patches.py

@@ -2,8 +2,6 @@
 
 
 def get_device():
-    # On Jetson Nano `OPENBLAS_CORETYPE=ARMV8` needs to be set, otherwise including OpenCV
-    # throws an illegal instruction error
     if os.path.exists("/proc/device-tree/model"):
         with open("/proc/device-tree/model", "r") as f:
             model = f.read()
@@ -12,6 +10,9 @@ def get_device():
     return "unknown"
 
 
-device = get_device()
-if device == "jetson-nano":
-    os.environ["OPENBLAS_CORETYPE"] = "ARMV8"
+def initialize_device():
+    # On Jetson Nano `OPENBLAS_CORETYPE=ARMV8` needs to be set, otherwise including OpenCV
+    # throws an illegal instruction error
+    device = get_device()
+    if device == "jetson-nano":
+        os.environ["OPENBLAS_CORETYPE"] = "ARMV8"

examples/image/set-thresholds.py

@@ -1,7 +1,9 @@
 #!/usr/bin/env python
-# flake8: noqa F401
 
-import device_patches  # Device specific patches for Jetson Nano (needs to be before importing cv2)  # noqa: F401
+# Device specific patches for Jetson Nano (needs to be before importing cv2)
+from device_patches import initialize_device
+
+initialize_device()
 
 try:
     import cv2