当PNet检测到一个超过阈值的anchor时，为什么要做转置？ about mtcnn HOT 2 OPEN

if y.shape[0] == 1: # only one point exceed threshold
    y = y.T
    x = x.T
    score = map[x,y].T
    dx1 = dx1.T
    dy1 = dy1.T
    dx2 = dx2.T
    dy2 = dy2.T
    # a little stange, when there is only one bb created by PNet
    
    #print("1: x,y", x,y)
    a = (x*map.shape[1]) + (y+1)
    x = a/map.shape[0]
    y = a%map.shape[0] - 1
    #print("2: x,y", x,y)
else:
    score = map[x,y]