class_docstr: Test TransRAC utils
code: def test_dense_map(self):
      dummy_x = torch.rand(3)
      dense_map = DenseMap(
          input_dim=3, hidden_dim_1=8, hidden_dim_2=8, out_dim=5
      )
      out = dense_map(dummy_x)
      self.assertTrue(out.shape == torch.Size([5]))
  
imports: import unittest
  import torch
  from towhee.models.transrac import DenseMap, SimilarityMatrix
label_desc: Use image node_id 1 for calling the TestUtils obj's underlying member method code with example usage: obj.test_dense_map() without return types