UniverseNet
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Have you tried PAA assign as anchor assigner?
As shown in Table 10(USB: Universal-Scale Object Detection Benchmark), PAA has a better performance than atss. Actually, the difference between paa and atss is the way of IOU awareness and anchor assigner(atss uses atss assigner, paa uses paa assigner based on maxiou assigner). and according to the paper of PAA, the 2 step anchor assigner PAA contributes more to the better performance. However, I got a worse result when I combined paa assigner and vfocal dense head(maybe a wrong implemention?). Have you tried paa assigner on GFL(vfocal is similiar with gfl)? Will paa assigner produce a worse result?
I haven't tried PAA and have no plans to use it for now.