Anchor generation - grid point or sliding window location?

[AKMourato]

📚 Documentation Issue

Greetings.
The info in RPN and anchor generator scripts indicates that the procedure for anchor generation is the same as presented in Faster R-CNN paper although I find some aspects strange.
The article states that the anchors are generated at each sliding window location of the 3x3 conv layer, corresponding to centre of the sliding window.
From the scripts I've mentioned, it seems that the anchors are generated separately at grid points of the specific feature map (stride dependent then), rather than in the centre of the supposed sliding window.

Can someone please clarify this event?

[AKMourato]

@ppwwyyxx could you please clarify? Thanks