code: def _scale_enum(anchor, scales):
          
          w, h, x_ctr, y_ctr = AnchorGenerator._whctrs(anchor)
          ws = w * scales
          hs = h * scales
          anchors = AnchorGenerator._mkanchors(ws, hs, x_ctr, y_ctr)
          return anchors
docs: Enumerate a set of anchors for each scale wrt an anchor.