code: def forward_expected(self, inputs):
      (x,) = inputs
      return tuple([x[s] for s in self.slices])
  
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 4 for calling the TestSplitAxis obj's underlying member method code with example usage: obj.forward_expected(inputs) and returns: tuple