code: def forward(self, inputs, device):
      (x,) = inputs
      return functions.split_axis(
          x, self.ys_section, self.axis, force_tuple=True
      )
  
imports: import unittest
  import numpy
  import six
  import chainer
  from chainer import functions
  from chainer import testing
  from chainer.testing import backend
label_desc: Use image node_id 3 for calling the TestSplitAxis obj's underlying member method code with example usage: obj.forward(inputs, device) and returns: functions