code: def setUp(self):
      N = 3
      n_channels = 3
      self.x = pooling_nd_helper.shuffled_linspace(
          (N, n_channels, 12, 8), numpy.float32
      )
      self.rois = numpy.array(
          [
              [1, 1, 6, 6],
              [2, 6, 11, 7],
              [1, 3, 10, 5],
              [3, 3, 3, 3],
              [1.1, 2.2, 3.3, 4.4],
          ],
          dtype=numpy.float32,
      )
      self.roi_indices = numpy.array([0, 2, 1, 0, 2], dtype=numpy.int32)
      n_rois = self.rois.shape[0]
      outsize = _pair(self.outsize)
      self.gy = numpy.random.uniform(
          -1, 1, (n_rois, n_channels, outsize[0], outsize[1])
      ).astype(numpy.float32)
      self.check_backward_options = {"atol": 5e-4, "rtol": 5e-3}
  
imports: import unittest
  import numpy
  import chainer
  from chainer import cuda
  from chainer import functions
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
  from chainer.testing import condition
  from chainer_tests.functions_tests.pooling_tests import pooling_nd_helper
label_desc: Use image node_id 1 for calling the TestROIAlign2D obj's underlying member method code with example usage: obj.setUp() without return types