code: def testExtractPolyphonicMultiProgram(self):
      testing_lib.add_track_to_sequence(
          self.note_sequence,
          0,
          [
              (60, 100, 0.0, 4.0),
              (64, 100, 0.0, 3.0),
              (67, 100, 1.0, 2.0),
          ],
      )
      self.note_sequence.notes[0].program = 2
      quantized_sequence = sequences_lib.quantize_note_sequence(
          self.note_sequence, steps_per_quarter=1
      )
  
      seqs, _ = polyphony_lib.extract_polyphonic_sequences(
          quantized_sequence
      )
      self.assertEqual(0, len(seqs))
  
imports: import copy
  from magenta.common import testing_lib
  from magenta.models.polyphony_rnn import polyphony_lib
  from note_seq import sequences_lib
  from note_seq import testing_lib
  from note_seq.protobuf import music_pb2
  import tensorflow.compat.v1
label_desc: Use image node_id 21 for calling the PolyphonyLibTest obj's underlying member method code with example usage: obj.testExtractPolyphonicMultiProgram() without return types