Return the string message associated with TensorBoard purges.

def _GetPurgeMessage(most_recent_step, most_recent_wall_time, event_step,
                     event_wall_time, num_expired_scalars, num_expired_histos,
                     num_expired_comp_histos, num_expired_images,
                     num_expired_audio):
  """Return the string message associated with TensorBoard purges."""
  return ('Detected out of order event.step likely caused by '
          'a TensorFlow restart. Purging expired events from Tensorboard'
          ' display between the previous step: {} (timestamp: {}) and '
          'current step: {} (timestamp: {}). Removing {} scalars, {} '
          'histograms, {} compressed histograms, {} images, '
          'and {} audio.').format(most_recent_step, most_recent_wall_time,
                                  event_step, event_wall_time,
                                  num_expired_scalars, num_expired_histos,
                                  num_expired_comp_histos, num_expired_images,
                                  num_expired_audio)