code: def setUp(self):
      self.maxDiff = None  # pylint:disable=invalid-name
  
      self.note_sequence = common_testing_lib.parse_test_proto(
          music_pb2.NoteSequence,
          """
          tempos: {
            qpm: 60
          }
          ticks_per_quarter: 220
          """,
      )
  
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 1 for calling the PolyphonyLibTest obj's underlying member method code with example usage: obj.setUp() without return types