code: def test_restore(self):
      agent = TestAgent(self.alg)
      obs = torch.randn(10, 4)
      output = agent.predict(obs)
      save_path1 = "model.ckpt"
      previous_output = agent.predict(obs).detach().cpu().numpy()
      agent.save(save_path1)
      agent.restore(save_path1)
      current_output = agent.predict(obs).detach().cpu().numpy()
      np.testing.assert_equal(current_output, previous_output)
  
imports: import numpy
  import unittest
  import os
  import torch
  import torch.nn
  import torch.optim
  import parl
label_desc: Use image node_id 4 for calling the ACAgentBaseTest obj's underlying member method code with example usage: obj.test_restore() without return types