code: def testMatrixRagged(self):
      test_value = ragged_factory_ops.constant(
          [["I love ∰"], [b"a", b"bc"]]
      )
      expected_tokens = [
          [
              [
                  ord("I"),
                  ord(" "),
                  ord("l"),
                  ord("o"),
                  ord("v"),
                  ord("e"),
                  ord(" "),
                  ord("∰"),
              ]
          ],
          [[ord("a")], [ord("b"), ord("c")]],
      ]
      expected_offset_starts = [
          [[0, 1, 2, 3, 4, 5, 6, 7]],
          [[0], [0, 1]],
      ]
      expected_offset_ends = [
          [[1, 2, 3, 4, 5, 6, 7, 10]],
          [[1], [1, 2]],
      ]
      tokens = self.tokenizer.tokenize(test_value)
      self.assertAllEqual(tokens, expected_tokens)
      (tokens, starts, ends) = self.tokenizer.tokenize_with_offsets(
          test_value
      )
      self.assertAllEqual(tokens, expected_tokens)
      self.assertAllEqual(starts, expected_offset_starts)
      self.assertAllEqual(ends, expected_offset_ends)
  
      detokenized = self.tokenizer.detokenize(tokens)
      self.assertAllEqual(detokenized, test_value)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops.ragged import ragged_factory_ops
  from tensorflow.python.platform import test
  from tensorflow_text.python.ops.unicode_char_tokenizer import UnicodeCharTokenizer
label_desc: Use image node_id 7 for calling the UnicodeCharTokenizerOpTest obj's underlying member method code with example usage: obj.testMatrixRagged() without return types