code: def test_model(self):
      dummy_input = torch.rand(1, 128)
      out = self.model(dummy_input)
      self.assertEqual(out.shape, (1, 32))
  
imports: import unittest
  import torch
  from towhee.models.vis4mer.linearactivation import LinearActivation
label_desc: Use image node_id 1 for calling the LinearActivationTest obj's underlying member method code with example usage: obj.test_model() without return types