Hi, Thank you alex.

I would suggest you to visualize the proposals for debugging. Take a single image and train for few iterations and visualize the proposals. If they are satisfying you are ion the right track. Also, this video might help you https://www.youtube.com/watch?v=4yOcsWg-7g8&list=PLq9NkIsPNPvEbjklF2pdekbj17bpVx0A5&index=71&t=1080s

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Let me know if you are on the right track.

I would like to examine your code if you are stuck.

Thank you.