code: def apply_pts(self, pts, width):
      oldx = pts[:, 0::2].copy()
      pts[:, 0::2] = width - oldx - 1
      return pts
  
imports: from __future__ import absolute_import
  from __future__ import print_function
  from __future__ import division
  from numbers import Number, Integral
  import cv2
  import numpy
  import math
  import copy
  from .operators import register_op, BaseOperator
  from ppdet.modeling.rbox_utils import poly2rbox_le135_np, poly2rbox_oc_np, rbox2poly_np
  from ppdet.utils.logger import setup_logger
  from ppdet.utils.compact import imagedraw_textsize_c
label_desc: Use image node_id 3 for calling the RandomRFlip obj's underlying member method code with example usage: obj.apply_pts(pts, width) and returns: pts