code: def setUp(self):
      self.default_debug = chainer.is_debug()
      chainer.set_debug(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 1 for calling the TestSplitAxisInvalidSections obj's underlying member method code with example usage: obj.setUp() without return types