code: def setUp(self):
      shape = (4, 2, 1)
  
      if not hasattr(self, "slices"):
          axes = self.axes
          offsets = self.offsets
  
          # Convert axes, offsets and shape to slices
          if isinstance(offsets, int):
              offsets = tuple([offsets] * len(shape))
          if isinstance(axes, int):
              axes = tuple([axes])
  
          slices = [slice(None)] * len(shape)
          for axis in axes:
              slices[axis] = slice(
                  offsets[axis], offsets[axis] + shape[axis]
              )
  
          if hasattr(self, "new_axes"):
              slices.insert(self.new_axes, None)
  
          self.axes = axes
          self.offsets = offsets
          self.slices = tuple(slices)
  
      self.check_backward_options.update({"atol": 5e-4, "rtol": 5e-4})
      self.check_double_backward_options.update(
          {"atol": 1e-3, "rtol": 1e-3}
      )
  
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 1 for calling the TestGetItem obj's underlying member method code with example usage: obj.setUp() without return types