code: def jitter_label_op(sequence_tensor, jitter_amount_sec):
      def jitter_label(sequence_tensor):
          sequence = music_pb2.NoteSequence.FromString(sequence_tensor)
          sequence = sequences_lib.shift_sequence_times(
              sequence, jitter_amount_sec
          )
          return sequence.SerializeToString()
  
      return tf.py_func(jitter_label, [sequence_tensor], tf.string)
  
imports: import collections
  import functools
  import io
  import re
  import wave
  import zlib
  import librosa
  from magenta.models.onsets_frames_transcription import audio_transform
  from magenta.models.onsets_frames_transcription import constants
  from magenta.models.onsets_frames_transcription import drum_mappings
  from magenta.models.onsets_frames_transcription import melspec_input
  from note_seq import audio_io
  from note_seq import sequences_lib
  from note_seq.protobuf import music_pb2
  import numpy
  import tensorflow.compat.v1
label_desc: Use image node_id 15 for calling a global function with example usage: jitter_label_op(sequence_tensor, jitter_amount_sec) and returns: tf, sequence