Return up to num_records of golden chunks to train on.

  Returns:
    A list of golden chunks up to num_records in length, sorted by path.

def get_golden_chunk_records():
  """Return up to num_records of golden chunks to train on.

  Returns:
    A list of golden chunks up to num_records in length, sorted by path.
  """

  pattern = os.path.join(fsdb.golden_chunk_dir(), '*.zz')
  return sorted(tf.gfile.Glob(pattern), reverse=True)[:FLAGS.window_size]