4.19: Hailo8 does not work, Hailo8L works

General
1

Ref my previous post, with a fresh Pi5 os installation and the latest hailo 4.19 libraries:

  • I have a Hailo8 (not a Hailo8L)
    -:~/picamera2/examples/hailo $ python detect.py with default .hef I get the following warning:
    [HailoRT] [warning] HEF was compiled for Hailo8L device, while the device itself is Hailo8. This will result in lower performance.
    BUT DETECTIONS WORK
  • same program, but specifying a custom .hef compiled for Hailo8, that was working with 4.18, I don’t get the warning but I get:
    File “/home/a/picamera2/examples/hailo/detect.py”, line 20, in extract_detections
    score = detection[4]
    ~~~~~~~~~^^^
    IndexError: invalid index to scalar variable.

Any help?

2

@Nadav
After long testing, I found the issue. It is not related to 8 vs 8L.
I believe it is something you have changed / fixed going from 4.18 to 4.19
that broke some existing code:
~/picamera2/examples/hailo $ python detect.py
4.18:
detections = extract_detections(results[0], video_w, video_h, class_names, args.score_thresh)
4.19:
detections = extract_detections(results, video_w, video_h, class_names, args.score_thresh)

I just wish there were a place that describes the changes 4.18-4.19

3

Hey Thor,

I’ll investigate this error on my setup and test the fix you suggested. If the issue is related to a version change in our side, we’ll make sure to update our documentation accordingly.

Thanks for bringing this to our attention!

Note: this is a picamera2 app which is rpi software.

Best regards,
Omria

4

Hi, the issue was reported to Raspberry pi with the required fix. Should be updated soon in picamera2.

You can also use our detection example in GitHub - hailo-ai/hailo-rpi5-examples