code: def _get_pad_test_input_2d(self):
      data = np.arange(256, dtype=np.float32)
  
      return data.reshape([4, 8, 4, 2])
  
imports: from __future__ import division, absolute_import, print_function
  import functools
  import numpy
  import tensorflow
  from tensorflow.contrib.layers.python.layers import regularizers
  from niftynet.layer.convolution import ConvLayer
  from niftynet.layer.convolution import ConvolutionalLayer
  from tests.niftynet_testcase import NiftyNetTestCase
label_desc: Use image node_id 7 for calling the ConvTest obj's underlying member method code with example usage: obj._get_pad_test_input_2d() and returns: data