I want to use yolov7 on unreal engine

Understood. There is an API made for Neural Network purposes inside the engine that might be of use to you, though it’s usually used a bit differently from what I gather. Since it can use ONNX runtimes it may be applicable, though you’ll have to vet that claim as I’m mostly a layman to ML. Nico may know of better resources however!

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However I couldn’t find any resources on YOLO implementation with Unreal, it does seem that some users have done it, though their repo is undisclosed.

Here’s a Repo using YOLOv7 in C++ that could offer some inspiration, though it’s not built for Unreal Engine.