code: def _str_items_custom(self):
      cs = self._metric_json["centroid_stats"]
      return [
          "Total Within Cluster Sum of Square Error: {}".format(
              self.tot_withinss()
          ),
          "Total Sum of Square Error to Grand Mean: {}".format(
              self.totss()
          ),
          "Between Cluster Sum of Square Error: {}".format(
              self.betweenss()
          ),
          "Centroid stats are not available." if cs is None else cs,
      ]
  
imports: import h2o
  from h2o.model import MetricsBase
label_desc: Use image node_id 1 for calling the H2OClusteringModelMetrics obj's underlying member method code with example usage: obj._str_items_custom() and returns: list