code: def combine_matching_seqs(ns_ids):
      ns, ids = ns_ids
      beam_metrics.counter(
          "ExtractExamplesDoFn", "unique-examples"
      ).inc()
      ns.id = ",".join(ids)
      return ns
  
file_path: magenta/magenta/models/music_vae/preprocess_tfrecord.py
imports: import typing
  from absl import app
  from absl import flags
  from absl import logging
  import apache_beam
  from apache_beam import typehints
  from apache_beam.metrics import Metrics
  from magenta.models.music_vae import configs
  import note_seq
  from note_seq.sequences_lib import split_note_sequence_on_time_changes
  import numpy
label_desc: Use image node_id 1 for calling a global function with example usage: combine_matching_seqs(ns_ids) and returns: ns