code: def flip_boxes(boxes, im_width):
      """
      Horizontally flip the boxes.
      Args:
          boxes (array): box to flip.
          im_width (int): width of the image.
      Returns:
          boxes_flipped (array): flipped box.
      """
  
      boxes_flipped = boxes.copy()
      boxes_flipped[:, 0::4] = im_width - boxes[:, 2::4] - 1
      boxes_flipped[:, 2::4] = im_width - boxes[:, 0::4] - 1
      return boxes_flipped
  
imports: import math
  import numpy
  import cv2
label_desc: Use image node_id 14 for calling a global function with example usage: flip_boxes(boxes, im_width) and returns: boxes_flipped