code: def unclip(self, box, unclip_ratio=1.5):
      poly = Polygon(box)
      distance = poly.area * unclip_ratio / poly.length
      offset = pyclipper.PyclipperOffset()
      offset.AddPath(
          box, pyclipper.JT_ROUND, pyclipper.ET_CLOSEDPOLYGON
      )
      expanded = np.array(offset.Execute(distance))
  
      return expanded
  
imports: import os
  import math
  import yaml
  from shapely.geometry import Polygon
  import PIL.Image
  import numpy
  import cv2
  import pyclipper
  import torch
  from .model.constructor import Configurable
label_desc: Use image node_id 16 for calling the DBNet obj's underlying member method code with example usage: obj.unclip(box, unclip_ratio) and returns: expanded