code: def testStringLength(self):
      strings = [[["1", "12"], ["123", "1234"], ["12345", "123456"]]]
  
      with self.cached_session() as sess:
          lengths = string_ops.string_length(strings)
          values = self.evaluate(lengths)
          self.assertAllEqual(values, [[[1, 2], [3, 4], [5, 6]]])
  
imports: from tensorflow.python.framework import test_util
  from tensorflow.python.ops import string_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 1 for calling the StringLengthOpTest obj's underlying member method code with example usage: obj.testStringLength() without return types