code: def test4DimRaggedMatrix(self, encoding):
      test_value = ragged_factory_ops.constant(
          [
              [[[72, 101, 108, 108, 111], [87, 111, 114, 108, 100]]],
              [[[]], [[72, 121, 112, 101]]],
          ],
          np.int32,
      )
      expected_value = [
          [["Hello".encode(encoding), "World".encode(encoding)]],
          [["".encode(encoding)], ["Hype".encode(encoding)]],
      ]
      unicode_encode_op = ragged_string_ops.unicode_encode(
          test_value, encoding
      )
      self.assertAllEqual(unicode_encode_op, expected_value)
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import errors_impl
  from tensorflow.python.framework import tensor_spec
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops.ragged import ragged_factory_ops
  from tensorflow.python.ops.ragged import ragged_string_ops
  from tensorflow.python.ops.ragged import ragged_tensor
  from tensorflow.python.ops.ragged import ragged_tensor_value
  from tensorflow.python.platform import test
label_desc: Use image node_id 15 for calling the UnicodeEncodeOpTest obj's underlying member method code with example usage: obj.test4DimRaggedMatrix(encoding) without return types