Latest posts
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Feature Pyramid Networks: the maths, the architecture, and a ResNet-50 → FPN → YOLO detector
FPN turns a backbone’s internal hierarchy into a pyramid with strong features at every scale, using a neck that is almost entirely linear. The paper’s equations, every tensor shape for ResNet-50 at 640×640, and a working torchvision detector with an FPN neck and a YOLO-style head.