code: def test_polygon_area(self):
      # Draw polygon boxes
      for d in [5.0, 10.0, 1000.0]:
          polygon = PolygonMasks([[[0, 0, 0, d, d, d, d, 0]]])
          area = polygon.area()[0]
          target = d**2
          self.assertEqual(area, target)
  
      # Draw polygon triangles
      for d in [5.0, 10.0, 1000.0]:
          polygon = PolygonMasks([[[0, 0, 0, d, d, d]]])
          area = polygon.area()[0]
          target = d**2 / 2
          self.assertEqual(area, target)
  
imports: import contextlib
  import io
  import numpy
  import unittest
  from collections import defaultdict
  import torch
  import tqdm
  from fvcore.common.benchmark import benchmark
  from pycocotools.coco import COCO
  from tabulate import tabulate
  from torch.nn import functional
  from detectron2.data import MetadataCatalog
  from detectron2.layers.mask_ops import pad_masks, paste_mask_in_image_old, paste_masks_in_image, scale_boxes
  from detectron2.structures import BitMasks, Boxes, BoxMode, PolygonMasks
  from detectron2.structures.masks import polygons_to_bitmask
  from detectron2.utils.file_io import PathManager
  from detectron2.utils.testing import random_boxes
label_desc: Use image node_id 4 for calling the TestMaskCropPaste obj's underlying member method code with example usage: obj.test_polygon_area() without return types