code: def setUp(self):
      N = 3
      n_channels = 3
      self.x = pooling_nd_helper.shuffled_linspace(
          (N, n_channels, 12, 8), self.dtype
      )
      self.rois = numpy.array(
          [
              [0, 1, 1, 6, 6],
              [2, 6, 2, 7, 11],
              [1, 3, 1, 5, 10],
              [0, 3, 3, 3, 3],
          ],
          dtype=self.dtype,
      )
      n_rois = self.rois.shape[0]
      self.outh, self.outw = 5, 7
      self.spatial_scale = 0.6
      self.gy = numpy.random.uniform(
          -1, 1, (n_rois, n_channels, self.outh, self.outw)
      ).astype(self.dtype)
      if self.dtype == numpy.float16:
          self.check_backward_options = {
              "dtype": numpy.float64,
              "atol": 1e-2,
              "rtol": 1e-2,
          }
      else:
          self.check_backward_options = {"atol": 1e-3, "rtol": 1e-2}
  
file_path: chainer/tests/chainer_tests/functions_tests/pooling_tests/test_roi_pooling_2d.py
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
  from chainer_tests.functions_tests.pooling_tests import pooling_nd_helper
label_desc: Use image node_id 1 for calling the TestROIPooling2D obj's underlying member method code with example usage: obj.setUp() without return types