code: def _emit_select(self, cluster_ids, **kwargs):
          
          # Remove non-existing clusters from the selection.
          cluster_ids = self._keep_existing_clusters(cluster_ids)
          logger.debug("Select cluster(s): %s.",
                       ', '.join(map(str, cluster_ids)))
          self.emit('select', cluster_ids, **kwargs)
docs: Choose spikes from the specified clusters and emit the
          `select` event on the GUI.