code: def test_mobilenetv2(self):
      mobilenet_v2 = MobileNetV2()
      self.assertEqual(
          mobilenet_v2(self.img).shape, torch.Size([1, 1280, 1, 43])
      )
  
imports: from unittest import TestCase
  import torch
  from mmocr.models.textrecog.backbones import MobileNetV2
label_desc: Use image node_id 2 for calling the TestMobileNetV2 obj's underlying member method code with example usage: obj.test_mobilenetv2() without return types