code: def test_empty_input(self):
      inputs = np.array([], dtype=np.string_)
      segment_ids = [1, 0, 1]
      num_segments = 2
      separator = ":"
      with self.assertRaises(
          (ValueError, errors_impl.InvalidArgumentError)
      ):
          self.evaluate(
              string_ops.unsorted_segment_join(
                  inputs=inputs,
                  segment_ids=segment_ids,
                  num_segments=num_segments,
                  separator=separator,
              )
          )
  
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 errors_impl
  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 11 for calling the UnsortedSegmentJoinOpTest obj's underlying member method code with example usage: obj.test_empty_input() without return types