code: def test_n_step_forward_gpu(self):
      self._test_n_step_forward(gpu=0)
  
imports: import unittest
  import chainer
  from chainer import functions
  from chainer import links
  from chainer import testing
  import numpy
  from chainerrl.links import StatelessRecurrentSequential
label_desc: Use image node_id 2 for calling the TestStatelessRecurrentSequential obj's underlying member method code with example usage: obj.test_n_step_forward_gpu() without return types