code: def testUnknownShape(self):
      # Testing an unkown shape in graph.
      with ops.Graph().as_default():
          t = array_ops.space_to_depth(
              array_ops.placeholder(dtypes.float32), block_size=4
          )
          self.assertEqual(4, t.get_shape().ndims)
  
imports: import numpy
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  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_v2
  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 19 for calling the SpaceToDepthTest obj's underlying member method code with example usage: obj.testUnknownShape() without return types