code: def test_3d_max_shape(self):
      input_param = {"func": "MAX", "kernel_size": 3, "stride": 3}
  
      self._test_nd_downsample_output_shape(
          rank=3, param_dict=input_param, output_shape=(2, 6, 6, 6, 8)
      )
  
file_path: NiftyNet/tests/downsample_test.py
imports: from __future__ import absolute_import, print_function
  import tensorflow
  from niftynet.layer.downsample import DownSampleLayer
  from tests.niftynet_testcase import NiftyNetTestCase
label_desc: Use image node_id 4 for calling the DownSampleTest obj's underlying member method code with example usage: obj.test_3d_max_shape() without return types