code: def testSmall2(self):
      block_size = 3
      self._compare(1, 2, 3, 2, block_size, "NHWC")
      self._compare(1, 2, 3, 2, block_size, "NCHW")
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.client import device_lib
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors_impl
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gen_array_ops
  from tensorflow.python.ops import gradient_checker
  from tensorflow.python.ops import math_ops
  from tensorflow.python.platform import test
  from tensorflow.python.platform import tf_logging
label_desc: Use image node_id 4 for calling the DepthToSpaceGradientTest obj's underlying member method code with example usage: obj.testSmall2() without return types