code: def test_multi_gpu_forward_training(self):
      self.check_multi_gpu_forward(True)
  
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import gradient_check
  from chainer import links
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 8 for calling the TestNStepBiGRU obj's underlying member method code with example usage: obj.test_multi_gpu_forward_training() without return types