code: def test_q_values(self):
      self.assertIsInstance(self.av.q_values, torch.Tensor)
      torch_assert_allclose(self.av.q_values, self.q_values)
  
imports: import unittest
  import numpy
  import pytest
  import torch
  from pfrl import action_value
  from pfrl.testing import torch_assert_allclose
label_desc: Use image node_id 2 for calling the TestQuantileDiscreteActionValue obj's underlying member method code with example usage: obj.test_q_values() without return types