code: def test_model(self):
      dummy_input = torch.rand(1, 8, 32, 32)
      out = self.model(dummy_input)
      self.assertEqual(out.shape, (1, 8, 32, 32))
  
imports: import unittest
  import torch
  from towhee.models.vis4mer.activation import Activation
label_desc: Use image node_id 1 for calling the ActivationTest obj's underlying member method code with example usage: obj.test_model() without return types