code: def test_poly_make_valid(self):
      poly = Polygon([[0, 0], [1, 1], [1, 0], [0, 1]])
      self.assertFalse(poly.is_valid)
      poly = poly_make_valid(poly)
      self.assertTrue(poly.is_valid)
      # invalid input
      with self.assertRaises(AssertionError):
          poly_make_valid([0, 0, 1, 1, 1, 0, 0, 1])
      poly = Polygon(
          [
              [337, 441],
              [326, 386],
              [334, 397],
              [342, 412],
              [296, 382],
              [317, 366],
              [324, 427],
              [315, 413],
              [308, 400],
              [349, 419],
              [337, 441],
          ]
      )
      self.assertFalse(poly.is_valid)
      poly = poly_make_valid(poly)
      self.assertTrue(poly.is_valid)
  
imports: import unittest
  from itertools import chain, permutations
  import numpy
  import torch
  from shapely.geometry import MultiPolygon, Polygon
  from mmocr.utils import boundary_iou, crop_polygon, offset_polygon, poly2bbox, poly2shapely, poly_intersection, poly_iou, poly_make_valid, poly_union, polys2shapely, rescale_polygon, rescale_polygons, shapely2poly, sort_points, sort_vertex, sort_vertex8
label_desc: Use image node_id 8 for calling the TestPolygonUtils obj's underlying member method code with example usage: obj.test_poly_make_valid() without return types