code: def testVectorDecode(self):
      text = constant_op.constant(["仅今年前".encode("utf-8"), b"hello"])
      chars = ragged_string_ops.unicode_decode(text, "utf-8")
      expected_chars = [
          [ord(c) for c in "仅今年前"],
          [ord(c) for c in "hello"],
      ]
      self.assertAllEqual(chars, expected_chars)
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.eager import context
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import sparse_tensor
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gen_string_ops
  from tensorflow.python.ops.ragged import ragged_factory_ops
  from tensorflow.python.ops.ragged import ragged_string_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 3 for calling the UnicodeDecodeTest obj's underlying member method code with example usage: obj.testVectorDecode() without return types