code: def test_rnn_cpu(self):
      self._test_non_lstm(gpu=-1, name="RNN")
  
file_path: pfrl/tests/utils_tests/test_recurrent.py
imports: import unittest
  import pytest
  import torch
  from torch import nn
  from pfrl.testing import torch_assert_allclose
  from pfrl.utils.recurrent import concatenate_recurrent_states, get_recurrent_state_at, mask_recurrent_state_at
label_desc: Use image node_id 8 for calling the TestRecurrentStateFunctions obj's underlying member method code with example usage: obj.test_rnn_cpu() without return types