code: def test_forward(self):
      model = MiniVGG()
      model.init_weights()
      model.train()
  
      imgs = torch.randn(1, 3, 32, 160)
      feats = model(imgs)
      self.assertEqual(feats.shape, torch.Size([1, 512, 1, 41]))
  
imports: from unittest import TestCase
  import torch
  from mmocr.models.textrecog.backbones import MiniVGG
label_desc: Use image node_id 1 for calling the TestMiniVGG obj's underlying member method code with example usage: obj.test_forward() without return types