code: def test_2d_linear_circular_converge(self):
      self._test_simple_2d_images("linear", "circular")
  
imports: from __future__ import absolute_import, print_function, division
  import base64
  import numpy
  import tensorflow
  from niftynet.layer.grid_warper import AffineGridWarperLayer
  from niftynet.layer.resampler import ResamplerLayer
  from tests.niftynet_testcase import NiftyNetTestCase
label_desc: Use image node_id 5 for calling the image_2D_test_converge obj's underlying member method code with example usage: obj.test_2d_linear_circular_converge() without return types