(1) No particular theoretical reason. A possible reason is the ground truth objects have scale closer to those layers and therefore we want more guesses.
(2) 38*38*4 + 19*19*6 + 10*10*6 + 5*5*6 + 3*3*4 + 1*1*4 = 8732
(1) No particular theoretical reason. A possible reason is the ground truth objects have scale closer to those layers and therefore we want more guesses.
(2) 38*38*4 + 19*19*6 + 10*10*6 + 5*5*6 + 3*3*4 + 1*1*4 = 8732