code: def testUtf8BinarizeMatrix(self):
      test_value = [["爱上一个不回"], ["foo"]]
      expected_values = []
      for row in test_value:
          expected_values.append([])
          for s in row:
              expected_values[-1].append(
                  sum(
                      [
                          self._lowest_bits_little_endian(c, n_bits=4)
                          for c in s[:3]
                      ],
                      [],
                  )
              )
      values = tf_text.utf8_binarize(
          test_value, word_length=3, bits_per_char=4
      )
      self.assertAllEqual(values, expected_values)
  
file_path: text/tensorflow_text/python/ops/utf8_binarize_op_test.py
imports: import numpy
  import tensorflow
  import tensorflow_text
  from tensorflow.lite.python import interpreter
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import test
label_desc: Use image node_id 4 for calling the Utf8BinarizeTest obj's underlying member method code with example usage: obj.testUtf8BinarizeMatrix() without return types