def _ratio_enum(anchor, ratios):
 (w, h, x_ctr, y_ctr) = _whctrs(anchor)
 size = (w * h)
 size_ratios = (size / ratios)
 ws = np.round(np.sqrt(size_ratios))
 hs = np.round((ws * ratios))
 anchors = _mkanchors(ws, hs, x_ctr, y_ctr)
 return anchors

def _ratio_enum ( anchor , ratios ) : ( w , h , x_ctr , y_ctr ) = _whctrs ( anchor ) size = ( w * h ) size_ratios = ( size / ratios ) ws = np . round ( np . sqrt ( size_ratios ) ) hs = np . round ( ( ws * ratios ) ) anchors = _mkanchors ( ws , hs , x_ctr , y_ctr ) return anchors
enumerate a set of anchors for each aspect ratio wrt an anchor .