code: def test_normalize_adjacent_matrix(self):
      adjacent_matrix = np.random.randint(0, 2, (16, 16))
      normalized_matrix = normalize_adjacent_matrix(adjacent_matrix)
      self.assertEqual(normalized_matrix.shape, adjacent_matrix.shape)
  
imports: from unittest import TestCase, mock
  import numpy
  import torch
  from mmocr.models.textdet.heads.drrg_head import GCN, DRRGHead, LocalGraphs, ProposalLocalGraphs, feature_embedding, normalize_adjacent_matrix
label_desc: Use image node_id 1 for calling the TestUtils obj's underlying member method code with example usage: obj.test_normalize_adjacent_matrix() without return types