Why is the output of RPN k*k?

[ma3252788]

As shown in the figure below, RPN has generated many proposals, and, due to the existence of anchors, the sizes of these proposals should be different. In the faster rcnn, the sizes are unified after roi Pooling. There is no ROI Pooling here. Why RPN How about direct output as k*k?

[JialeCao001]

@ma3252788 Thanks for interest. It has a RoI pooling here.