YOLOX support for OpenVINO Detector

[aeozyalcin]

This PR is to add YOLOX support for the newly added OpenVINO detector. I added a new config parameter called model_type, which is ssd by default to match the default ssdlite_mobilenet_v2 model that comes with Frigate. Users can change this to yolox to use a yolox model instead. After the changes, I confirmed that the existing SSD OpenVINO support still works.

I have also added a text into the documents explaining how to use a yolox model, and what the limitations are.

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[aeozyalcin]

@NateMeyer FYI

[NateMeyer]

I'll take a closer look and try to run this later today. Do you have any insight on the differences between this and the yolov4 models?

[aeozyalcin]

I'll take a closer look and try to run this later today. Do you have any insight on the differences between this and the yolov4 models?

I believe YOLOx is anchorless, while most other YOLO variants have anchors. Post processing the tensors would require a little more math due to anchors. What I have here for YOLOx should be 90% of the way there to support other YOLO variants as well. So maybe in the future, that could be explored.

[NateMeyer]

I played with this a bit today and it seems to run pretty well. In general the code looks pretty good to me.

[aeozyalcin]

@NateMeyer @NickM-27 are there any opens on this before it can be merged?

[NickM-27]

@NateMeyer @NickM-27 are there any opens on this before it can be merged?

First need to get checks passing

[aeozyalcin]

Alright 3rd time's the charm. If you can kick off the checks, it would be great.

[aeozyalcin]

All green!

[aeozyalcin]

@NateMeyer @NickM-27 let me know if there are any other opens preventing this merge. Thanks.