code: def get_4d_input(self):
      input_4d = {"testdata": np.ones((16, 16, 16, 8))}
      interp_order = {"testdata": (3,) * 8}
      return input_4d, interp_order
  
file_path: NiftyNet/tests/rand_spatial_scaling_test.py
imports: from __future__ import absolute_import, print_function
  import numpy
  import tensorflow
  from niftynet.layer.rand_spatial_scaling import RandomSpatialScalingLayer
  from tests.niftynet_testcase import NiftyNetTestCase
label_desc: Use image node_id 1 for calling the RandRotationTest obj's underlying member method code with example usage: obj.get_4d_input() and returns: input_4d,  interp_order