Add yolo-v5 example

[mayocream]

Fix #1858

[sdabbour]

I've been diving into the code recently to investigate implementation of an example for Qwen 3 VL. These are just some things I noticed from a layout perspective.

[sdabbour]

Would this model be better placed in the candle-transformers/src/models/ dir?

[slckl]

Probably not, yolov5 is quite old, it's ok to implement your own models for whoever needs it based on candle-examples?

[sdabbour]

Not sure if this is necessary to include, could maybe describe a bit how to get the model in the README.md file

[slckl]

I think it's probably fine for a small stand-alone python script to be included, especially one that is somewhat obvious like this one.

if there's anything I'd change, is to maybe make it stand-alone executable with uv by including dependencies in the script itself: https://docs.astral.sh/uv/guides/scripts/#declaring-script-dependencies

then one can just uv run script.py without much thinking.

[slckl]

Yolov5 is quite old by now, but still surprisingly popular. I've confirmed the present impl works.

Would like to see output logs + classes/confidences in output annotations, and this would be a fine addition.

[slckl]

I think it's probably fine for a small stand-alone python script to be included, especially one that is somewhat obvious like this one.

if there's anything I'd change, is to maybe make it stand-alone executable with uv by including dependencies in the script itself: https://docs.astral.sh/uv/guides/scripts/#declaring-script-dependencies

then one can just uv run script.py without much thinking.

[slckl]

Probably not, yolov5 is quite old, it's ok to implement your own models for whoever needs it based on candle-examples?

[slckl]

I can confirm this works and produces sane-looking output 😃

[slckl]

can you please include class labels + confidence on the output image? similar to how yolo-v8 example does it?

I would also be grateful if you println logged the class names + bbox data similar to how yolo-v8 example does it? It's very useful to validate any numerical changes in the library etc:

            println!(
                "{}: {:?}",
                candle_examples::coco_classes::NAMES[class_index],
                b
            );