code: def test_overlay_instances_no_boxes(self):
      img, boxes, labels, polygons, _ = self._random_data()
      v = Visualizer(img, self.metadata)
      v.overlay_instances(
          masks=polygons, boxes=None, labels=labels
      ).get_image()
  
imports: import numpy
  import os
  import tempfile
  import unittest
  import cv2
  import torch
  from detectron2.data import MetadataCatalog
  from detectron2.structures import BoxMode, Instances, RotatedBoxes
  from detectron2.utils.visualizer import ColorMode, Visualizer
label_desc: Use image node_id 6 for calling the TestVisualizer obj's underlying member method code with example usage: obj.test_overlay_instances_no_boxes() without return types