code: def polygon_area(x, y):
      # Using the shoelace formula
      # https://stackoverflow.com/questions/24467972/calculate-area-of-polygon-given-x-y-coordinates
      return 0.5 * np.abs(
          np.dot(x, np.roll(y, 1)) - np.dot(y, np.roll(x, 1))
      )
  
imports: import copy
  import itertools
  from typing import Any, Iterator, List, Union
  import numpy
  import torch
  import torchvision
  from .boxes import Boxes
label_desc: Use image node_id 1 for calling a global function with example usage: polygon_area(x, y) and returns: unknown