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1) How (Is it possible) to combine Fast-RCNN (2-stage) and YOLO (1-stage)?

2) Why with the addition of anchor boxes we changed the resolution to 416 x 416? Why using anchor boxes we get a small decrease in accuracy? How does using anchor boxes decouple the class prediction mechanism from the spatial location? How do you guys feel about CenterNet (also a single-stage detector, but without anchor box)?

3) Why if we use standard k-means with Euclidean distance larger boxes generate more error than smaller boxes? How to derive d(box, centroid) = 1 - IOU(box, centroid)?

4) How to derive Pr(object) * IOU(b, object) = σ(to) in Yolo v2 ? Why is this expression not used in Yolo v3?

5) Why apply a Sigmoid function to tx and ty? Why apply an exponential function to pw and ph?

6) From yolov3-spp.cfg, I did not see anything about 3 different scales. Could anyone advise?

7) Why does YOLO v3 tensor size need to be multiplied by N*N? What is represented by N?

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  • $\begingroup$ Even if it's a cross post which was send to other AI forums at the same time, it's a great question which is referencing to a lot of ressources. I'm not able to answer all these question alone, but if somebody is doing so, he can learn a lot about the Yolo architecture. $\endgroup$ – Manuel Rodriguez Jun 20 at 11:15
  • $\begingroup$ Welcome to the crowd! Since the questions are a mix of theory (research papers) and practice (codes hosted on GitHub), I personally prefer to break it into a couple of posts. Otherwise, it's very likely that you get a lot of responses but each answer only part of the questions. $\endgroup$ – Borhan Kazimipour Jun 20 at 12:17
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    $\begingroup$ Hi Kevin! Please, ask just one question per post. If you have more than one (not very related) questions, ask them in separate posts. $\endgroup$ – nbro Jun 20 at 14:36
  • $\begingroup$ @nbro So, I need to set up 7 separate posts ? Even then, I doubt people really responds... I have already emailed YOLO authors, yet no replies. $\endgroup$ – kevin Jun 22 at 7:00
  • $\begingroup$ @kevin Yes, I would say you start with the most basic question then you go to the next, etc. It is not guaranteed you will receive an answer, though. $\endgroup$ – nbro Jun 22 at 12:02

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