code: def load_2d_image(self, loader=None):
      data = image_loader.load_image_obj(
          CASE_LOGO_2D, loader=loader
      ).get_data()
      self.assertAllClose(data.shape, (400, 677, 1, 1, 4))
  
file_path: NiftyNet/tests/image_loader_test.py
imports: from __future__ import absolute_import, print_function
  import os
  import numpy
  import tensorflow
  import niftynet.io.image_loader
  from tests.niftynet_testcase import NiftyNetTestCase
label_desc: Use image node_id 2 for calling the ImageLoaderTest obj's underlying member method code with example usage: obj.load_2d_image(loader) without return types