Raspberry Pi 5 Hailo8L Python Yolo Object detection setup example

General
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Hi there,

I’m trying to get set up with running models using Python 3.10 on my Raspberry Pi 5.

I’ll be honest, this has been a frustrating onboarding experience. Beyond the initial pi git repo (GitHub - hailo-ai/hailo-rpi5-examples) it’s been a bit of a challenge to find materials to start with and I’m still no there :frowning:

I’ve found a few different posts / pages:

Things that would be helpful to know from the hailo-rpi5-examples

  • Point me to the place I can download the whl package and guide me through installing the correct package
  • Provide a link to the hef files that are supported for the 8L platform
  • Provide docs for converting models to hef format

I’ve installed what I think are the correct packges:

pip install hailort-4.20.0-cp310-cp310-linux_aarch64.whl

cloned the example repo:

git clone https://github.com/hailo-ai/Hailo-Application-Code-Examples.git
cd Hailo-Application-Code-Examples/runtime/python/object_detection

Downloaded a .hef 8L compatible YOLO model from: hailo_examples/models/yolov8n_relu6_coco--640x640_quant_hailort_hailo8l_1/yolov8n_relu6_coco--640x640_quant_hailort_hailo8l_1.hef at main · DeGirum/hailo_examples · GitHub

run:

./download_resources.sh
./object_detection.py -n ./yolov8n_relu6_coco--640x640_quant_hailort_hailo8l_1.hef -i zidane.jpg

I get the following script error:

Exception in thread Thread-2 (postprocess):
Traceback (most recent call last):
  File "/home/andy/.pyenv/versions/3.10.16/lib/python3.10/threading.py", line 1016, in _bootstrap_inner
    self.run()
  File "/home/andy/.pyenv/versions/3.10.16/lib/python3.10/threading.py", line 953, in run
    self._target(*self._args, **self._kwargs)
  File "/home/andy/development/dog-detector/Hailo-Application-Code-Examples/runtime/python/object_detection/./object_detection.py", line 196, in postprocess
    detections = utils.extract_detections(infer_results)
  File "/home/andy/development/dog-detector/Hailo-Application-Code-Examples/runtime/python/object_detection/object_detection_utils.py", line 161, in extract_detections
    bbox, score = det[:4], det[4]
IndexError: string index out of range

I can see an output folder being created but no results are rendered on the image.

Is there something I’m missing here or does the example code just not work?

Many thanks in advance for any help.

2

Hi @Gtech
Welcome to the Hailo community. We understand that the initial setup can seem a bit overwhelming. We will try to see if we can help. Your particular problem is due to mixing of two tools: trying to run models from DeGirum repo using scripts from Hailo repo. DeGirum PySDK is a wrapper over HailoRT designed to make working with Hailo device easier. Did you follow the flow outlined in DeGirum/hailo_examples: DeGirum PySDK with Hailo AI Accelerators?

3

Hi Shashi,

Thanks for your patience. The Raspberry Pi repo doesn’t really progress any further with how to start using the hef model format in a python script. I was assuming there would be python bindings for performing inference - I assume this is DeGirum? Or is there a different method of using hef models?

I’ll take a look at the link you’ve provided later this evening, many thanks.