code: def testDedup3dInputRaises(self):
      dense_input = tf.constant(
          [[[b"a", b"a"], [b"b", b"b"]], [[b"a", b"a"], [b"d", b"d"]]]
      )
      with self.assertRaises(ValueError):
          mappers.deduplicate_tensor_per_row(dense_input)
  
imports: import numpy
  import tensorflow
  from tensorflow_transform import mappers
  from tensorflow_transform import test_case
label_desc: Use image node_id 14 for calling the MappersTest obj's underlying member method code with example usage: obj.testDedup3dInputRaises() without return types